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HINATA, Hirofumi

    Graduate School of Science and Engineering　Civil and Environmental Engineering　Professor
Last Updated :2021/03/05

Researcher Information

URL

Research funding number

  • 70272680

J-Global ID

Research Interests

  • microplastics   tsunami   HFレーダ   東シナ海   東京湾   黒潮   吹送流   海洋ゴミ   wind-driven current   HF oceanic radar   Kuroshio   chaotic advection   Marine debris   

Research Areas

  • Life sciences / Aquaculture
  • Social infrastructure (civil Engineering, architecture, disaster prevention) / Hydroengineering
  • Natural sciences / Atmospheric and hydrospheric science

Academic & Professional Experience

  • 2014/04 - Today  Ehime UniversityGraduate School of Science and Engineering, Engineering for Production and Environment教授
  • 2007 - 2014/03  国土交通省国土技術政策総合研究所 室長
  • 2001 - 2007  National Institute for Land and Infrastructure Management
  • 2000 - 2001  運輸省港湾技術研究所 主任研究官
  • 1995 - 2000  Tokyo Institute of TechnologySchool of Engineering

Education

  •        -   Tokyo Institute of Technology  School of Engineering  土木工学科
  •        -   Tokyo Institute of Technology  Science of Engineering  Civil Engineering

Association Memberships

  • 水産海洋学会   海洋学会   土木学会   

Published Papers

  • Hirofumi Hinata, Kazuki Ohno, Noa Sagawa, Tomoya Kataoka, Hidetaka Takeoka
    Marine Pollution Bulletin 160 111548 - 111548 0025-326X 2020/11 [Peer-reviewed]
     Scientific journal
  • Hirofumi Hinata, Nao Sagawa, Tomoya Kataoka, Hidetaka Takeoka
    Marine Pollution Bulletin 152 0025-326X 2020/03 [Peer-reviewed]
     Scientific journal 
    © 2020 Elsevier Ltd A model of the beach process of marine plastics was proposed based on the assumption of the beaching and backwashing flux balance, and its applicability was examined by means of time-invariant linear system analysis and particle tracking experiments with respect to the ratio between the residence time of plastics on a beach (τr) and the period of nearshore current variability (T0). Based on the theory, the balance was expected to hold when τr/T0 was much smaller than 1; however, good agreement was obtained between the theory and the particle tracking method for much larger values of τr/T0. The parameters, which are diagnostically given in the model, will be prognostically decided by the coastal dynamics in the future to develop robust beach process models. Nevertheless, we believe that a diagnostic approach would be another pillar in the strategy for estimating the amounts and distributions of marine plastics in the coming years.
  • An interlaboratory comparison exercise for the determination of micro plastics in standard sample bottles
    Isobe et
    Marine pollution bulletin 146 831 - 837 2019/07 [Peer-reviewed]
     Scientific journal
  • Yutaka Michida, Suchana Chavanich, Andrés Cózar Cabañas, Pascal Hagmann, Hirofumi Hinata, Atsuhiko Isobe, Peter Kershaw, Nikolai Kozlovskii, Daoji Li, Amy L.Lusher, Elisa Martí, Sherri A. Mason, Jingli Mu, Hiroaki Saito, Won Joon Shim, Agung Dhamar Syakti, Hideshige Takada, Richard Thompson, Tadashi Tokai, KeiichiUchida, Katerina Vasilenko, Juying Wang
    1 - 71 2019/05 Research society
  • IRIE Masayasu, KUSAKABE Pao, YAMANISHI Satoshi, HINATA Hirofumi
    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 公益社団法人 土木学会 75 (2) I_1315 - I_1320 1884-2399 2019 [Peer-reviewed]
     

     This study develops how to assimilate tsunami currents observed by high frequency ocean radars in three dimensional current modeling for the projection of tsunami debris in case the Nankai Trough Megathrust earthquake occurs. Regional Ocean Modeling System (ROMS) is used for the assimilation in Osaka Bay with forcings of tides, freshwater, and wind as well as tsunami currents in three dimensional coordinates. In order to assimilate the tsunami component of the surface currents with the consideration of a tsunami's momentum, high-frequency component is extracted from the observed surface velocities using discrete wavelet transform and assimilated to all vertical layers by nudging. This pragmatic approach better represents both of currents and surface elevation.

  • OGATA Kohei, ODAGIRI Yuki, FUJI Ryotaro, HINATA Hirofumi
    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 公益社団法人 土木学会 75 (2) I_1309 - I_1314 1884-2399 2019 [Peer-reviewed]
     

     Recent researches on tsunami detection with high-frequceny ocean surface radars revealed that the tsunami-detection performance with high-frequecny ocean surface radar (HF radar) strongly depends on the sea surface state and ionospheric condition, means that to realize tsunami early warning system using HF radars, we need to comprehend the seasonal variation of the tsunami detection performance based on longterm radar observations in different sea surface and/or ionospheric conditions. Here, we examined the seasonal variation based on virtual tsunami observation experiments using one-year (2014) HF radar observation data obtained at the west coast of Kii Peninsula and a tsunami simulation for a Mw 9.0 Nankai Trough earthquake. We concluded that the tsunami detection performance on the continental shelf slope depends on ionospheric conditions as well as sea surface state.

  • 遠州灘における海洋レーダの津波観測性能評価 -仮想津波観測実験を用いた検討-
    田中良仁, 上原史洋, 日向博文, 藤良太郎
    土木学会論文集B2（海岸工学） 74 2018/11 [Peer-reviewed]
     Scientific journal
  • 別府湾におけるマイクロプラスチック の堆積フラックス
    桝本一成, 加三千宣, 日向博文
    土木学会論文集B2（海岸工学） 74 2018/11 [Peer-reviewed]
     Scientific journal
  • Assessment of the sources and inflow processes of microplastics in the river environments of Japan
    Tomoya Kataoka, Yasuo Nihei, Kouki Kudo, Hirofumi Hinata
    Environmental Pollution 244 958 - 965 2018/11 [Peer-reviewed]
     Scientific journal
  • Nao Sagawa, Keiyu Kawaai, Hirofumi Hinata
    Marine Pollution Bulletin 133 532 - 542 1879-3363 2018/08 [Peer-reviewed]
     Scientific journal 
    Microplastics have adverse effects on marine life. This study examined the abundance and size of microplastics as well as their polymer types in the surface water and the bottom and beach sediments of Hiroshima Bay. The fragmentation process and sinking factors of foamed polystyrene (FPS) microplastics were also examined. Serious FPS pollution spread out not only in the beach sediments but also in the bottom sediments. The average size of FPS particles in the bottom sediments was significantly smaller than that of beached FPS particles. Field emission scanning electron microscopy images suggest that large amounts of microsized or nanosized FPS fragments are likely to be generated from the margins of beached FPS microplastics. X-ray computed tomography images show that FPS microplastics from the bottom sediments had tunnel-like structures inside the particle. Based on these images, FPS microplastics in the bottom sediments were susceptible to biofouling and soil deposition.
  • Kohei Ogata, Shuji Seto, Ryotaro Fuji, Tomoyuki Takahashi, Hirofumi Hinata
    Remote Sensing 10 (7) 2018/07 [Peer-reviewed]
     Scientific journal 
    © 2018 by the authors. The tsunami generated by the 2011 Tohoku-Oki earthquake was the first time that the velocity fields of a tsunami were measured by using high-frequency oceanographic radar (HF radar) and since then, the development of HF radar systems for tsunami detection has progressed. Here, a real-time tsunami detection method was developed, based on virtual tsunami observation experiments proposed by Fuji et al. In the experiments, we used actual signals received in February 2014 by the Nagano Japan Radio Co., Ltd. radar system installed on the Mihama coast and simulated tsunami velocities induced by the Nankai Trough earthquake. The tsunami was detected based on the temporal change in the cross-correlation of radial velocities between two observation points. Performance of the method was statistically evaluated referring to Fuji and Hinata. Statistical analysis of the detection probability was performed using 590 scenarios. The maximum detection probability was 15% at 4 min after tsunami occurrence and increased to 80% at 7 min, which corresponds to 9 min before tsunami arrival at the coast. The 80% detection probability line located 3 km behind the tsunami wavefront proceeded to the coast as the tsunami propagated to the coast. To obtain a comprehensive understanding of the tsunami detection probability of the radar system, virtual tsunami observation experiments are required for other seasons in 2014, when the sea surface state was different from that in February, and for other earthquakes.
  • Y. Toguchi, S. Fujii, H. Hinata
    Journal of Geophysical Research: Oceans 123 (4) 2965 - 2980 2169-9291 2018/04 [Peer-reviewed]
     Scientific journal 
    Tsunami waves and the subsequent natural oscillations generated by the 2011 Tohoku earthquake were observed by two high-frequency (HF) radars and four tidal gauge records in Ise Bay. The radial velocity components of both records increased abruptly at approximately 17:00 (JST) and continued for more than 24 h. This indicated that natural oscillations followed the tsunami in Ise Bay. The spectral analyses showed that the tsunami wave arrivals had periods of 16–19, 30–40, 60–90, and 120–140 min. The three longest periods were remarkably amplified. Time-frequency analysis also showed the energy increase and duration of these periods. We used an Empirical Orthogonal Function (EOF) to analyze the total velocity of the currents to find the underlying oscillation patterns in the three longest periods. To verify the physical properties of the EOF analysis results, we calculated the oscillation modes in Ise Bay using a numerical model proposed by Loomis. The results of EOF analysis showed that the oscillation modes of 120–140 and 60–90 min period bands were distributed widely, whereas the oscillation mode of the 30–40 min period band was distributed locally. The EOF spatial patterns of each period showed good agreement with the eigenmodes calculated by the method of Loomis (1975). Thus, the HF radars were capable of observing the tsunami arrival and the subsequent oscillations.
  • SETO Shuji, TAKAHASHI Tomoyuki, HINATA Hirofumi, FUJI Ryotaro, Imamura Fumihiko
    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 公益社団法人 土木学会 74 (2) I_511 - I_516 1884-2399 2018 [Peer-reviewed]
     Scientific journal 
     In the 2011 Tohoku earthquake tsunami disaster, the oceanographic radars installed at the coastal area of Japan and USA observed the tsunami, which proved the possibility for tsunami observation by using oceanographic radar. After the Tohoku tsunami, studies by using oceanographic radar were reported, but the research topics were mainly on tsunami observation and detection. Quantitative evaluations such as the estimation of wave peak is important in order that oceanographic radar contributes to tsunami disaster prevention and mitigation. In this study, the method to estimate a wave peak of tsunami by using a single oceanographic radar was examined and applied for a tsunami scenario in the Nankai Trough. The tsunami numerical modeling for the tsunami source of Mw9.1 and 8.6 in the Nankai Trough was carried out and gave radial velocity distributions to be observed by oceanographic radar. The wave peak was estimated by using the radial velocity distribution and was compared with the wave peak calculated by the outputted water distribution. As a result, the location of the wave peak is estimated well. And the water level of the wave peak is estimated with an error range of -20% to 10%.
  • マイクロプラスチックの海岸滞留時間の見積もり
    日向 博文
    月刊 海洋 49 (12) 641 - 644 2017/12 Symposium
  • Ryotaro Fuji, Hirofumi Hinata
    JOURNAL OF OCEANOGRAPHY 73 (6) 725 - 741 0916-8370 2017/12 Scientific journal 
    The combination of a high-frequency ocean surface radar and a tsunami detection method should be assessed as the onshore-offshore distribution of tsunami detection probability, because the probability will vary in accordance with the signal-to-noise ratio (SNR) and the tsunami magnitude in addition to the radar system specifications. Here, we statistically examine the tsunami detection distance based on virtual tsunami observation experiments by using signals received by a high-frequency radar in February 2014 installed on the southern coast of Japan and numerically simulated velocities induced by a Nankai Trough earthquake. In the experiments, the Doppler frequencies associated with the simulated velocities were superimposed on the receiving signals of the radar, and the radial velocities were calculated from the synthesized signals by the fast Fourier transform. Tsunami arrival was then detected based on the temporal change in the cross-correlation of the velocities, before and after tsunami arrival, between two points 3 km apart along a radar beam. We found that the possibility of tsunami detection primarily depends on the kinetic energy ratio between tsunami current and background current velocities. The monthly average detection probability is over 90% when the energy ratio exceeds 5 (offshore distance: 9 km <= L <= 36 km) and reduces to 50% when the energy ratio is approximately 1 (L = 42 km) over the shelf slope. The ratio varied with the background current physics and SNR, which was mainly affected by ocean surface wave heights and ionospheric electron density.
  • チリ沿岸で発生する遠地津波を対象とした海洋レーダの観測性能に関する検討
    岡本 萌, 高橋 智幸, 日向 博文, 藤 良太郎
    土木学会論文集B2(海岸工学) 73 (2) I_433 - I_438 2017/10 [Peer-reviewed]
     Scientific journal
  • 仮想津波観測実験に基づく海洋レーダによるリアルタイム津波検知手法の開発
    尾方 浩平, 藤良 太郎, 日向 博文
    土木学会論文集B2(海岸工学) 73 (2) I_1615 - I_1620 2017/10 [Peer-reviewed]
     Scientific journal
  • Hirofumi Hinata, Keita Mori, Kazuki Ohno, Yasuyuki Miyao, Tomoya Kataoka
    MARINE POLLUTION BULLETIN 122 (1-2) 17 - 26 0025-326X 2017/09 [Peer-reviewed]
     Scientific journal 
    Residence times of microplastics were estimated based on the dependence of meso- and macrolitter residence times on their upward terminal velocities (UTVs) in the ocean obtained by one- and two-year mark-recapture experiments conducted on Wadahama Beach, Nii-jima Island, Japan. A significant linear relationship between the residence time and UTV was found in the velocity range of about 0.3-0.9 ms(-1), while there was no significant difference between the residence times obtained in the velocity range of about 0.9-1.4 ms(-1). This dependence on the UTV would reflect the uprush-backwash response of the target items to swash waves on the beach. By extrapolating the linear relationship down to the velocity range of microplastics, the residence times of microplastics and the 1D onshore-offshore diffusion coefficients were inferred, and are one to two orders of magnitude greater than the coefficients of the macroplastics.
  • 工藤功貴, 片岡智哉, 二瓶泰雄, 日向博文, 島崎穂波, 馬場大樹
    土木学会論文集B1（水工学） 73 (4) I_1225 - I_1230 2017 [Peer-reviewed]
  • 渡久地優, 藤井智史, 日向 博文
    土木学会論文集B2(海岸工学) 63 2016/11 [Peer-reviewed]
     Scientific journal
  • HINATA Hirofumi, CHEN Binkon, KATAOKA, Tomoya
    土木学会論文集B2(海岸工学) 63 2016/11 [Peer-reviewed]
     Scientific journal
  • Hirofumi Hinata, Tomoya Kataoka
    MARINE POLLUTION BULLETIN 109 (1) 490 - 494 0025-326X 2016/08 Scientific journal 
    We propose a belt transect setting strategy for mark-recapture experiments (MREs) to evaluate the time-independent 1D diffusion coefficient (< D-p0 >) of marine litter in the cross-shore direction that determines the backwashing flux of the litter, based on two-year MREs for plastic floats (PFs) on Wadahama Beach, Nii-jima Island, Japan. When the alongshore width of the belt transect (L-t) was of the order of, or longer than, the length scale of wave-induced nearshore current circulation (L-c), the PFs were rarely transported alongshore across the selected transects prior to being backwashed offshore. Thus, the transect residence time became longer and showed a much weaker dependence on the transect position, in contrast to when L-t was even shorter than L-c. We therefore obtained the diffusion coefficients close to the value of (< D-p0 >) when we set L-t to the order of, or longer than, L-c. (C) 2016 Elsevier Ltd. All rights reserved.
  • The observation of propagating tsunami wave and response characteristics in IseBay by HF radar
    Toguchi, Y, Fujii, S, Hinata, H
    Proceedings of the 3rd ocean radar conference for Asia-Pacific 69 - 73 2016/04 [Peer-reviewed]
     International conference proceedings
  • Yu Toguchi, Satoshi Fujii, Hirofumi Hinata
    2016 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP) 452 - 453 2016 [Peer-reviewed]
     International conference proceedings 
    A tsunami generated by "The 2011 off the Pacific coast of Tohoku Earthquake" was observed by two high frequency ocean surface radars (HF radars) and four tide gauges installed on Ise Bay. The tsunami wave arrived initially at 16: 50 was observed by tide gauge which is installed on the mouth of the Bay. This wave propagation was also observed by HF radars installed on the inner part of the Bay. Therefore, these observations were considered to be correlated. The result of spectral analysis, the tsunami wave had energy with period bands of 120-140, 60-90 and 30-40 min. In comparison to the previous study suggest that these 60-90 and 30-40 min periods oscillations were attributed to the tsunami source fault.
  • 最上川における漂流ごみ全体及び流木輸送量の把握と漂流ごみ対策技術の検討
    南まさし, 二瓶泰雄, 西島拓駿, 片岡智哉, 日向博文
    河川技術論文集 22 499 - 504 2016 [Peer-reviewed]
  • Tomoya Kataoka, Hirofumi Hinata, Shigeru Kato
    MARINE POLLUTION BULLETIN 101 (2) 539 - 548 0025-326X 2015/12 Scientific journal 
    A key factor for determining the residence time of macroplastics on a beach is the process by which the plastics are backwashed offshore (backwash process). Here, we deduced the backwash process of plastic fishing floats on Wadahama Beach based on the analysis of two-year mark-recapture experiments as well as nearshore current structures revealed by sequential images taken by za webcam installed at the edge of a cliff behind the beach. The analysis results revealed the occurrence of a combination of offshore currents and convergence of alongshore currents in the surf zone in storm events around a submerged breakwater off the northern part of the beach, where 48% of the backwashed floats were last found. We conclude that the majority of the floats on the beach were transported alongshore and tended to concentrate in the convergence zone, from where they were backwashed offshore by the nearshore currents generated in the events. (C) 2015 Elsevier Ltd. All rights reserved.
  • Tomoya Kataoka, Hirofumi Hinata
    MARINE POLLUTION BULLETIN 91 (1) 73 - 81 0025-326X 2015/02 Scientific journal 
    We established a method for evaluating beach cleanup effects (BCEs) based on a linear system analysis, and investigated factors determining BCEs. Here we focus on two BCEs: decreasing the total mass of toxic metals that could leach into a beach from marine plastics and preventing the fragmentation of marine plastics on the beach. Both BCEs depend strongly on the average residence time of marine plastics on the beach (tau(r)) and the period of temporal variability of the input flux of marine plastics (1). Cleanups on the beach where tau(r) is longer than Tare more effective than those where tau(r) is shorter than T. In addition, both BCEs are the highest near the time when the remnants of plastics reach the local maximum (peak time). Therefore, it is crucial to understand the following three factors for effective cleanups: the average residence time, the plastic input period and the peak time. (C) 2014 Elsevier Ltd. All rights reserved.
  • 日向博文
    沿岸海洋研究 52 (2) 169 - 175 1342-2758 2015/02 [Peer-reviewed][Invited]
     Scientific journal
  • Masashi Minami, Tatsuhito Onoi, Yasuo Nihei, Tomoya Kataoka, Hirofumi Hinata
    PROCEEDINGS OF THE 36TH IAHR WORLD CONGRESS 1013 - 1020 2015 [Peer-reviewed]
     International conference proceedings 
    Most marine debris are primarily supplied from inland areas; however, few monitoring data exist for floating-litter transport from rivers to the ocean due to the absence of appropriate monitoring methods. In this study, we developed an automatic and continuous monitoring technique for floating-litter transport L in rivers by using an image monitoring and processing technique in which different types of litter (scatter-type and mass-type) are separately analyzed. The results indicated that L evaluated by the present methods was in good agreement with the observed data in the Mogami River, Yamagata, Japan, demonstrating the fundamental performance of the present monitoring method.
  • 藤良太郎, 日向博文, 藤井智史, 永松宏, 小笠原勇, 伊藤浩之, 片岡智哉, 高橋智幸
    土木学会論文集 B2(海岸工学)(Web) 71 (2) I.337-I.342 (J-STAGE)  1883-8944 2015 Scientific journal
  • Masashi Minami, Tatsuhito Onoi, Yasuo Nihei, Tomoya Kataoka, Hirofumi Hinata
    PROCEEDINGS OF THE 36TH IAHR WORLD CONGRESS 71 (4) 1013 - 1020 2185-467X 2015 International conference proceedings 
    Most marine debris are primarily supplied from inland areas; however, few monitoring data exist for floating-litter transport from rivers to the ocean due to the absence of appropriate monitoring methods. In this study, we developed an automatic and continuous monitoring technique for floating-litter transport L in rivers by using an image monitoring and processing technique in which different types of litter (scatter-type and mass-type) are separately analyzed. The results indicated that L evaluated by the present methods was in good agreement with the observed data in the Mogami River, Yamagata, Japan, demonstrating the fundamental performance of the present monitoring method.
  • Shin'ichiro Kako, Atsuhiko Isobe, Tomoya Kataoka, Hirofumi Hinata
    MARINE POLLUTION BULLETIN 81 (1) 174 - 184 0025-326X 2014/04 Scientific journal 
    Large quantities of plastic litter are expected to wash ashore along the beaches of the East Asian marginal seas in the coming decade. Litter quantities were predicted using three techniques: a particle tracking model (PTM) used in conjunction with two-way PTM experiments designed to reveal litter sources, an inverse method used to compute litter outflows at each source, and a sequential monitoring system designed to monitor existing beach litter using webcams. Modeled year-to-year variation in litter quantities indicated that the amount of litter would continue to increase in the East Asian marginal seas if the level of outflow remains constant in the coming decade. The study confirms that about 3% of all East Asian beaches may potentially experience a 250-fold increase in the amount of plastic beach litter washed ashore in the next 10 years. (C) 2014 Elsevier Ltd. All rights reserved.
  • K. Nakayama, T. Shintani, K. Shimizu, T. Okada, H. Hinata, K. Komai
    JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 119 (3) 1977 - 1992 2169-9275 2014/03 [Peer-reviewed]
     Scientific journal 
    This study investigates the horizontal and residual circulations in Tokyo Bay using field observations, numerical simulations, and theoretical analysis. Numerical simulations show that the observed deepening of isopycnals and associated anticyclonic horizontal circulation in the bay head are mainly driven by negative wind stress curl. The effects of river discharge, surface heat fluxes, and tides are found to be small. Under strong wind events, the wind stress curl over the bay head can be large enough to make the surface Ekman layer strongly nonlinear. Theoretical and numerical analyses show that, under large negative wind stress curl, the nonlinearity tends to induce positive pumping velocity (at the base of the surface mixed layer) that counteracts the Ekman pumping; however, the typical duration of wind events in the bay head is not long enough to induce positive pumping under negative wind stress curl. These results and historical wind data suggest that the average horizontal circulation and residual circulation immediately below the surface mixed layer in Tokyo Bay are, respectively, cyclonic and convergent in summer but anticyclonic and divergent in winter.
  • K. Nakayama, T. Shintani, K. Shimizu, T. Okada, H. Hinata, K. Komai
    Journal of Geophysical Research: Oceans 119 (3) 1977 - 1992 2169-9291 2014 [Peer-reviewed]
     Scientific journal 
    This study investigates the horizontal and residual circulations in Tokyo Bay using field observations, numerical simulations, and theoretical analysis. Numerical simulations show that the observed deepening of isopycnals and associated anticyclonic horizontal circulation in the bay head are mainly driven by negative wind stress curl. The effects of river discharge, surface heat fluxes, and tides are found to be small. Under strong wind events, the wind stress curl over the bay head can be large enough to make the surface Ekman layer strongly nonlinear. Theoretical and numerical analyses show that, under large negative wind stress curl, the nonlinearity tends to induce positive pumping velocity (at the base of the surface mixed layer) that counteracts the Ekman pumping however, the typical duration of wind events in the bay head is not long enough to induce positive pumping under negative wind stress curl. These results and historical wind data suggest that the average horizontal circulation and residual circulation immediately below the surface mixed layer in Tokyo Bay are, respectively, cyclonic and convergent in summer but anticyclonic and divergent in winter. © 2014. American Geophysical Union. All Rights Reserved.
  • Influence of Integration Time on the Accuracy of Estimation of Tsunami Initial Sea Surface Elevation Based on Inversion Using Oceanographic Radar
    Fuji, R, H. Hinata, S. Fujii, T. Takahashi
    Ocean Sciences Meeting P1811 2014 [Peer-reviewed]
     International conference proceedings
  • OKAMOTO Megumi, SETO Shuji, TAKAHASHI Tomoyuki, HINATA Hirohumi
    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 公益社団法人 土木学会 70 (2) I_356 - I_360 1884-2399 2014 [Peer-reviewed]
     Scientific journal 
    Two oceanographic Radars targeting tsunamis had been installed in Wakayama Prefecture in Japan. To study observation capabilities of the radars on far field and near field tsunamis, numerical experiments were carried out. After starting the operation of the radars, nine earthquakes occurred in the observation area, however, they were too small to be observed by the radars. Parameter study on near field tsunamis showed the radars can observe earthquake of Mw 7 and very shallow Mw 6. As a far field tsunami, the 2012 Haida Gweii Earthquake Tsunami arrived at Japan, however, the radars could not detect it because of very small velocity. Parameter study on far field tsunamis showed the main energy of tsunamis off Canada propagates northward, and Oshika Peninsula is suitable to observe the tsunamis.
  • 短波海洋レーダの世界的な動向について
    日向 博文
    海洋調査技術 51 35 - 38 2014 [Invited]
     Symposium
  • T. Kataoka, H. Hinata, Y. Nihei
    ESTUARINE COASTAL AND SHELF SCIENCE 134 69 - 79 0272-7714 2013/12 Scientific journal 
    We numerically estimated the inflow flux of terrestrial grass, which is the main floating macro-debris, into Tokyo Bay from April 2008 to March 2009 based on a two-way particle-tracking model and an inverse method applying a Lagrange multiplier. In the estimation, we used surface current velocities derived by high-frequency ocean radar and the quantity of grass collected by clean-up vessels which are operated daily in the bay. At least 2115 m(3) yr(-1) of the grass flowed into the bay annually, and the contribution of a flood event to the inflow flux of grass was larger than that of the inflow flux of freshwater. We show that 39% of the annual inflow flux of grass into the bay was collected, and 61% flowed out of the bay or sank to the seabed. The numerical estimation in this study will be useful to establish a system for predicting patches of floating macro-debris in the bay, and to evaluate the effects of river development or clean-up along river banks and flood plains in the upper reaches. (C) 2013 Elsevier Ltd. All rights reserved.
  • Tomoya Kataoka, Hirofumi Hinata, Shigeru Kato
    MARINE POLLUTION BULLETIN 77 (1-2) 266 - 273 0025-326X 2013/12 Scientific journal 
    The exponential decay of the amount of new litter on Wadahama Beach, Nii-jima Island, Japan revealed by 20-month mark-recapture experiments demonstrates a linear response of the beach to the input of target items. Here we show the amplitude and phase characteristics of the beach as a time-invariant linear input/output system and discuss the hydrodynamic and geomorphological factors that would determine the characteristics with the aid of a diffusion equation. The characteristics are fully determined by the residence time of the items (tau(r) = 209 days) and can be described as functions of the ratio of tau(r) to the period of input variability. The decay is reproduced well by the analytical solution of the equation with a constant diffusion coefficient (D), whose order was estimated by tau(r) and the backshore width. Generally, D would depend on hydrodynamical statistics and beach geomorphology as well as the dimensions and density of the items. (C) 2013 Elsevier Ltd. All rights reserved.
  • 尾ノ井龍仁, 二瓶泰雄, 片岡智哉, 日向博文
    土木学会論文集 B1(水工学) 68 769 - 774 2013 [Peer-reviewed]
     Scientific journal
  • 藤良太郎, 日向博文, 藤井智史, 高橋智幸
    土木学会論文集B2(海岸工学) 69 (2) 436 - 440 2013 [Peer-reviewed]
     Scientific journal
  • Tomoya Kataoka, Hirofumi Hinata, Shin'ichiro Kako
    MARINE POLLUTION BULLETIN 64 (9) 1829 - 1836 0025-326X 2012/09 Scientific journal 
    We have developed a technique for detecting the pixels of colored macro plastic debris (plastic pixels) using photographs taken by a webcam installed on Sodenohama beach, Tobishima Island, japan. The technique involves generating color references using a uniform color space (CIELUV) to detect plastic pixels and removing misdetected pixels by applying a composite image method. This technique demonstrated superior performance in terms of detecting plastic pixels of various colors compared to the previous method which used the lightness values in the CIELUV color space. We also obtained a 10-month time series of the quantity of plastic debris by combining a projective transformation with this technique. By sequential monitoring of plastic debris quantity using webcams, it is possible to clean up beaches systematically, to clarify the transportation processes of plastic debris in oceans and coastal seas and to estimate accumulation rates on beaches. (C) 2012 Elsevier Ltd. All rights reserved.
  • 漂流ゴミ流入量に対する逆推定手法の東京湾への適用性と推定結果の水平拡散係数依存性
    片岡智哉, 日向博文
    沿岸海洋研究 49 (2) 113 - 126 2012 [Peer-reviewed]
     Scientific journal
  • 片岡智哉, 日向博文, 加古真一郎
    土木学会論文集B2(海岸工学) 68 (2) 1471 - 1475 2012 [Peer-reviewed]
     Scientific journal
  • 日向博文, 藤良太郎, 藤井智史, 藤田裕一, 花土弘, 片岡智哉, 水谷雅裕, 高橋智幸
    土木学会論文集B2(海岸工学) 68 (2) 196 - 200 2012 [Peer-reviewed]
     Scientific journal
  • Hirofumi Hinata, Satoshi Fujii, Keita Furukawa, Tomoya Kataoka, Masafumi Miyata, Takashi Kobayashi, Masahiro Mizutani, Takahiro Kokai, Nobuyoshi Kanatsu
    ESTUARINE COASTAL AND SHELF SCIENCE 95 (1) 268 - 273 0272-7714 2011/11 Scientific journal 
    Signals from the tsunami waves induced by the March 11, 2011 moment magnitude (M-w) 9.0 Tohoku-Oki earthquake and from subsequent resonances were detected as radial velocity variability by a high-frequency ocean surface radar (HF radar) installed on the eastern coast of the Kii Channel, at a range of about 1000 km from the epicenter along the eastern to southern coasts of Honshu Island. A time-distance diagram of band-passed (9-200 min) radial velocity along the beam reveals that the tsunami waves propagated from the continental shelf slope to the inner channel as progressive waves for the first three waves, and then natural oscillations were excited by the waves; and that the direction of the tsunami wave propagation and the axis of the natural oscillations differed from that of the radar beam. In addition, spectral analyses of the radial velocities and sea surface heights obtained in the channel and on the continental shelf slope suggest complex natural oscillation modes excited by the tsunami waves. The major advantage of the HF radars as tsunami detection is early warning as the tsunami is still far offshore. There is no doubt on this importance beside still technical and operational studies are needed. Our results adds a new role of the HF radars to measure the detailed surface current fields with high spatiotemporal resolution toward understanding detailed processes of resonant response to tsunami waves in coastal regions. (C) 2011 Elsevier Ltd. All rights reserved.
  • Shin'ichiro Kako, Atsuhiko Isobe, Shinya Magome, Hirofumi Hinata, Satoquo Seino, Azusa Kojima
    MARINE POLLUTION BULLETIN 62 (2) 293 - 302 0025-326X 2011/02 [Peer-reviewed]
     Scientific journal 
    This study attempts to establish a system for hindcasting/forecasting the quantity of litter reaching a beach using an ocean circulation model, a two-way particle tracking model (PTM) to find litter sources, and an inverse method to compute litter outflows at each source. Twelve actual beach survey results, and satellite and forecasted wind data were also used. The quantity of beach litter was hindcasted/forecasted using a forward in-time PTM with the surface currents computed in the ocean circulation model driven by satellite-derived/forecasted wind data. Outflows obtained using the inverse method was given for each source in the model. The time series of the hindcasted/forecasted quantity of beach litter were found consistent with the quantity of beach litter determined from sequential webcam images of the actual beach. The accuracy of the model, however, is reduced drastically by intense winds such as typhoons which disturb drifting litter motion. (C) 2010 Elsevier Ltd. All rights reserved.
  • Hirofumi Hinata, Nobuyoshi Kanatsu, Satoshi Fujii
    JOURNAL OF PHYSICAL OCEANOGRAPHY 40 (7) 1488 - 1500 0022-3670 2010/07 [Peer-reviewed]
     Scientific journal 
    The dependence of wind-driven current (WDC) on wind stress direction in a small semienclosed, homogeneous rotating basin is investigated using a linear steady-state analytical model based on Ekman solutions. The model is applicable to the middle of the basin (midbasin), and the current is driven by a constant wind stress of an arbitrary direction. The WDC is made up of wind stress-driven current (WSDC) and pressure-driven current (PDC) components. The laterally varying water depth of the basin confines the total volume transport in the longitudinal direction while the wind stress-driven volume transport changes direction according to the wind stress direction. Therefore, the pressure-driven volume transport or, equivalent, the pressure gradient depends on the wind stress direction: the relationship between the pressure gradient and the wind stress is anisotropic. As a result, the midbasin WDC is also dependent on the wind stress direction. The dependence varies according to the lateral position and Ekman number E. For large E (small rotation), the longitudinal volume transport is generally proportional to the longitudinal wind stress component. Hence, the ratio of the volume transport driven by the wind stress of direction theta (theta > 0) to that driven by the longitudinal wind stress (theta = 0) becomes cos theta. For small E (large rotation), the ratio becomes larger than cos theta. The extent to which each component of wind stress contributes to the generation of the pressure gradient to satisfy no-net-longitudinal and no-lateral transports is determined by a wind stress-pressure gradient transformation matrix, whose components depend on the lateral position and E.
  • Isobe Atsuhiko, Hinata Hirofumi, Hamada Takaharu
    沿岸海洋研究 日本海洋学会 47 (2) 1342-2758 2010/02 Research society 
    有明海湾奥の循環流の実体を明らかにするために,海底設置型ADCPによる流速連続観測を行なった。得られたデータから残差流成分を抽出し,上層残差流の変動の原因を推定するため,潮汐,河川流量,風を独立変数とする重回帰分析を行なった。その検証を数値モデルにより行ない,さらに,湾奥全域の残差流場がどのように変動しているかを考察した。その結果,冬季における太良町沖の上居残差流は,長軸方向については潮汐の変動の影響を,短軸方向成分については風の変動の影響を,強く受けることが示された。また,小長井町沖の残差流は,成層期には風の変動の影響を強く受けることが示された。さらに,潮汐・河川流量・風の変動が湾奥全域の残差流に及ぼす影響を数値モデルによって解析した。その結果,大潮時には地形に対応した水平循環,小潮時にはエスチャリー循環のパターンが卓越することが明らかになった。また,河川の変動による影響は成層期にのみ見られた。さらにまた,風による影響は季節によって異なるが,その原因は風の変動の大きさが変わったことによるだけではなく,残差流の応答特性自体が変化していることにもよっており,同じ風の変動を与えても引き起こされる残差流は季節によって異なったものとなることも解明された。
  • 漂流・漂着ゴミ問題に関連する法令と活動事例の整理
    片岡智哉, 日向博文
    国土技術政策総合研究所研究資料 (548) 2009
  • Satoquo Seino, Azusa Kojima, Hirofurni Hinata, Sin'nya Magome, Atsuhiko Isobe
    JOURNAL OF COASTAL RESEARCH SI56 1289 - 1292 0749-0208 2009 Scientific journal 
    Trans-boundary pollution is carried by currents and other flows. Litter from river basins flow into the sea, and currents and winds spread them along the coast. In Japan, many citizen groups, community based organizations, fishermen, divers, national and local governments, CBO and an international NGO have continued to clean up beaches, riverbanks and the sea bottom for some decades. Most of these activities are voluntary, but the costs accrued by local governments progressively multiplied. Beach and river litter have become serious social problems. Therefore, scientific and systematic countermeasures, multi-sectoral collaboration and international collaboration are essential.
  • Hirofumi Hinata, Tetsuo Yanagi, Chizuru Satoh
    JOURNAL OF OCEANOGRAPHY 64 (4) 605 - 620 0916-8370 2008/08 [Peer-reviewed]
     Scientific journal 
    The mechanism of a characteristic sea level response (barotropic coastal ocean response) to wind field fluctuation around the tip of the Izu Peninsula observed during the middle of December 2000 to the middle of January 2001 was investigated based on three types of numerical experiments using the Princeton Ocean Model with various parameters. The response was characterized by the relaxation of sea level falling (rising) during eastward upwelling (westward downwelling) favorable wind regime. Analyses of quasi-realistic numerical model results in terms of the vertically integrated momentum balances and vorticity balance for the barotropic mode revealed that: 1) development/abatement of two anomalous circulations generated around the tip of the Izu Peninsula controls the sea level response through the acceleration/deceleration of a quasi-geostrophic barotropic coastal current between the circulations; 2) nonlinear vorticity advection by the Kuroshio Current and by the coastal current, coupled with vorticity diffusion, decelerates the quasi - geostrophic coastal current in the latter half of the wind regimes, which induces the relaxation of sea level rise/fall. The results of the quasi-realistic numerical experiment suggest that an analysis of the vorticity balance for the barotropic mode contributes to a better understanding of sea level responses to wind in coastal regions with strong currents and complex topography. In addition, a numerical experiment with idealized spatially uniform density stratification and a quasi-realistic wind field shows that if the Kuroshio Current had been shifted far offshore from the Izu Peninsula during the observation period, westward propagating continental shelf waves would have controlled the coastal sea level response.
  • 中島謙二郎, 野村茂, 宮石晶史, 橋本典明, 日向博文, 峰元健正
    海洋開発論文集 24 849 - 854 0912-7348 2008
  • 有明海湾奥部における表層低塩分水の水平収束・発散とクロロフィルa濃度の関係
    柳哲雄, 石井大輔, 屋良由美子, 日向博文, 石坂丞二
    海の研究 2008
  • ＨＦレーダーによる漂流ゴミ回収効率化の試み
    日向博文, 諸星一信, 金津伸好
    沿岸海洋研究 45 (2) 105 - 114 2008
  • Hirofumi Hinata, Keita Furukawa
    The Environment in Asia Pacific Harbours 35 - 45 2006 [Peer-reviewed]
     In book 
    This study demonstrates the existence of an ecological network of short-necked clam larvae in Tokyo Bay. It also shows that the whole Tokyo Bay ecosystem may be improved if suitable spawning grounds, even if they are small, are conserved and restored. Thus, our strategy for zoning the primary implementation area in the Tokyo Bay Restoration Plan is justified. It should be noted that this paper has only introduced the fate of pelagic larvae in one spawning case. Further observations and numerical studies will be needed to clarify how the advection of pelagic larvae contributes to the reproduction of shortnecked clams. It will also be necessary to study how pelagic short-necked clam larvae respond to factors such as water temperature and salinity, the temporal variation of their specific gravity, and to add these results in the pelagic shortnecked clam larvae model. Beside this uncertainty, inherent in any ecosystem model, this study demonstrates the importance of an ecological network in Tokyo Bay. © 2006 Springer.
  • Hirofumi Hinata
    The Environment in Asia Pacific Harbours 67 - 78 2006 [Peer-reviewed]
     In book 
    In Tokyo Bay (Figure 1), the river discharge into the head of the bay gives rise to horizontal density gradients that lead to an estuarine circulation (Nakayama, 2005) as shown in chapter of "Circulation Phenomena in Tokyo Bay". If the oceanic water, i.e. the Kuroshio warm water, approaching to the bay and it is denser than the bay bottom water, then a classical estuarine circulation prevails whereby there is an outflow of bay waters at the surface and an inflow of oceanic water in the lower layer. However, fluctuations of the circulations in the bay can occur on time scales ranging from a few days to a few months due to the effects of climate and/or Kuroshio current fluctuations in the time scales. As a result, the depth at which oceanic water intrudes is also though to vary with oceanic and climate conditions. Yanagi et al. (1989) measured the water quality at the mouth of Tokyo Bay. They suggested that a three-layer circulation may exists whereby the Kuroshio water flows into the middle layer of the bay where the water density is the same, while highly turbid water flows out from the bay in the surface layer and lower layer. If this hypothesis is correct, then the inflow of oceanic water into the middle layer should have a significant effect on the behavior of the hypoxic water mass that develops in the lower layer of the bay during the summer. In September 1998, the intrusion of oceanic water into the middle layer of Tokyo Bay occurred intermittently. At this time, Hinata et al. (2001) used ADCP (Acoustic Doppler Current Profiler) observations and water quality observations to take direct measurements of the flow structures inside the bay and the heat/material flux between the bay and ocean. This chapter revisits the observations of Hinata et al. (2001) to describe the three-dimensional flow structures inside the bay and the heat and material flux between the bay and ocean that occur when oceanic water intrudes into the middle layer inside the bay during the summer. (figure presented).
  • H Hinata, T Yanagi, T Takao, H Kawamura
    JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 110 (C3) 0148-0227 2005/03 [Peer-reviewed]
     Scientific journal 
    The mechanisms of the periodic Kuroshio warm water intrusion (KWWI) into Sagami Bay through the Oshima West Channel (OWC) and the fluctuation of the current field in the bay were investigated using high-frequency oceanic radar observation data, satellite imagery, and meteorological data. During the period from 15 December 2000 to 16 January 2001 the Kuroshio took a nonlarge meander path, looping south around the Kii Peninsula and then turning sharply north toward the Izu Peninsula (IP). Kuroshio warm water (KWW) then flowed into Sagami Bay periodically through the OWC on a synoptic timescale of 8-11 days. Statistical analysis of the data indicated that the occurrence of the KWWI and the variability in the Kuroshio front were highly coherent with wind velocity field fluctuations corresponding to the passage of cyclones across northern Japan. When southward to southwestward winds dominated in and around Sagami Bay, the Kuroshio front approached the southern coast of the IP, and then the KWW strongly intruded into the bay through the OWC. When eastward to northeastward winds prevailed, the front moved offshore about 10-20 km, ending the KWWI. The distances of the Kuroshio front movements were consistent with the internal radius of the deformation estimated from conductivity-temperature-depth data collected off the IP, suggesting that the Kuroshio front movement was induced by the onshore-offshore surface Ekman transport associated with the wind velocity field regime shift corresponding to the passage of cyclones. In addition, examination of the vorticity dynamics in the northern part of the bay based on radar-derived surface current data indicated that the cyclonic circulation generated in the bay was enhanced due to the transport of the positive relative vorticity by the KWWI plus the horizontal convergence accompanied by the stretching of the vorticity.
  • ＨＦレーダーによる東京湾のM2潮流観測
    日向博文, 金津伸好, 佐藤健治, 松岡建志, 藤井智史, 高尾敏幸
    沿岸海洋研究 43 (1) 51 - 60 2005
  • Masami Hamaguchi, Tomoyuki Kasuya, Hirofumi Hinata, Keita Furukawa
    Bulletin of the Plankton Society of Japan 51 120 - 125 0387-8961 2004/08 
    The majority of the benthos are pelagic in their larval stages. The short-necked clam, Ruditapes philippinarum, which is widely distributed on sandy tidal flats across Japan and is a commercially important shellfish, has a planktonic larval stage, which lasts 2 to 3 weeks after hatching. In this stage, most clam larvae are able to disperse over wide areas with the currents and then settle on new habitats on other shores. In the case of Tokyo Bay, reclamation of the tidal flats and shallows has brought a marked decrease in the harvest of the clam. To recover the clam populations on the shores of Tokyo Bay, the creation of suitable habitats for the clam and the preservation of their environment are very important. We also need to understand how local populations of the clam are maintained through wide dispersal ranges over tidal flats during the larval stages. In this paper, we show the dynamics of larval dispersal of the clam in Tokyo Bay introducing the results of field plankton surveys conducted by the National Institute for Land and Infrastructure Management Ministry of Land and the National Research Institute of Fisheries and Environment of Inland Sea in 2001. The spatial distribution of the larval abundance of the clam was investigated at 65 stations along the entire range of Tokyo Bay on August 2, 6, 10 and October 15, 19, 23, in 2001. Identification of the larvae of the clam was performed using the monoclonal antibody technique. A large number of small D-shaped larvae were found shortly after hatching in the sea waters around the Banzu, Futtu, and Sanmaizu-Haneda in August and the Sanbanze, Sanmaizu-Haneda, and Kanazawa areas in October indicating that spawning populations in these areas probably contributed greatly to the larval supply in the bay. Moreover, the smallest size larvae also occurred abundantly around the Yokohama and Chiba port areas, suggesting that these port regions may play an important role in the transport of larvae into Tokyo Bay.
  • T Yanagi, H Hinata
    OCEAN DYNAMICS 54 (3-4) 452 - 459 1616-7341 2004/07 [Peer-reviewed]
     Scientific journal 
    Variability in water-exchange time between Tokyo Bay and the Pacific Ocean during winter is investigated based on the results of intensive field observation from November 2000 to March 2001. Water-exchange time between Tokyo Bay and the Pacific Ocean during winter mainly depends on the strength of northerly monsoon, being about 16 days under the weak monsoon and about 12 days under the strong monsoon. Moreover, it becomes longer by about I day in spring tide and shorter in neap tide due to the coupling effect of estuarine circulation and vertical mixing. Water-exchange time also varies depending on the open-ocean condition. When the warm water mass approaches from the Pacific Ocean to the mouth of Tokyo Bay through the eastern channel of Sagami Bay, which connects Tokyo Bay and the Pacific Ocean, water-exchange time becomes longer by about 2 days because the warm water mass is blocked in the surface layer at the bay mouth. On the other hand, when the warm water mass approaches to the mouth of Tokyo Bay through the western channel of Sagami Bay, water-exchange time becomes shorter by about I day because the warm water mass intrudes into the middle or lower layers of Tokyo Bay. Such different behavior of warm water mass at the mouth of Tokyo Bay is due to the difference in density of approaching warm water masses, that is, the density of the warm water mass through the eastern channel is smaller than that of the warm water mass through the western channel of Sagami Bay.
  • 相模湾への黒潮系暖水流入に与える海上風の影響について
    日向博文, 柳哲雄, 川村宏
    沿岸海洋研究 41 (2) 83 - 95 2004/04 [Peer-reviewed]
     Scientific journal 
    発行月不明
  • 内湾・内海域におけるベントス幼生の分散・回帰：東京湾におけるアサリを例に
    浜口昌巳, 粕谷智之, 日向博文, 古川恵太
    日本プランクトン学会誌 51 (2) 120 - 125 2004
  • 東京湾におけるアサリ浮遊幼生の分散
    浜口昌巳, 粕谷智之, 日向博文
    海洋と生物 26 242 - 250 2004
  • 日向博文, 宮野仁, 柳哲雄, 石丸隆, 粕谷智之, 川村宏
    海の研究 12 (2) 167 - 184 2003 [Peer-reviewed]
     Scientific journal
  • 黒潮水塊の沿岸域への影響－東京湾及び相模湾を例として－
    空と海 第78巻第2号,51-58 2002
  • 日向博文, 灘岡和夫, 八木宏, 田淵広嗣, 吉岡健
    土木学会論文集Ⅱ 584 (56) 93 - 111 2001 [Peer-reviewed]
     Scientific journal
  • 日向博文, 八木宏, 吉岡健, 灘岡和夫
    土木学会論文集Ⅱ 656 (52) 221 - 238 2000 [Peer-reviewed]
     Scientific journal
  • Velocity Field Measurements in a “Coastal Buffer Zone”
    HINATA Hirofumi
    COASTAL ENGINEERING CONFERENCE 3 3431 - 3441 1996 [Peer-reviewed]
     International conference proceedings
  • 東京湾における漂流ゴミ流入量に対する逆推定手法の適用性と推定結果の水平拡散係数依存性
    片岡智哉, 日向博文
    沿岸海洋研究 
    in press
  • 東京湾における推定ゴミ流入量の水平拡散係数に対する依存性
    片岡智哉, 日向博文
    国土技術政策総合研究所研究資料 
    印刷中

Books etc

  • Modelin and Analysis of Marine Environmental Problems, ed. By K. Omori, X. Guo, N. Yoshie, N. Fujii, I.C. Handoh, A. Isobe, and S. Tanabe
    Terrapub 2011
  • The Environment in Asia Pacific Harbours, ed. By Eric Wolanski
    Springer 2006

Conference Activities & Talks

  • Nao Sagawa, Keiyuu Kwaai, Hirofumi Hinata
    JpGU-AGU Joint Meeting 2020  2020/07
  • Hirofumi Hinata, MIchinobu Kuwae, Issei Masumoto, Yuto Kawamata, Yoshiaki Suzuki
    JpGU-AGU Joint Meeting 2020  2020/07
  • An estimation of microplatcis sedimentation flux in a coastal sea  [Invited]
    日向博文, 加三千宣, 桝本一成, 川又勇人
    JpGU-AGU Joint Meeting 2019  2019/05
  • Tsunami detection technique using by HF radar  [Invited]
    HINATA Hirofumi
    SENSISTEK-2018  2018/09
  • An estimation of the average residence times and onshore-offshore diffusivities of beached microplastics  [Not invited]
    Hirofumi Hinata, Keita Mori, Kazuki Ohno, Yasuyuki Miyao, Tomoya Kataoka
    ECSA 57  2018/09
  • Size and space distributions of micro plastics in a coastal sea heavily used for aquaculture  [Not invited]
    Nao Sagawa, Keiyu Kawaai, Hirofumi Hinata
    ECSA 57  2018/09
  • Tsunami wave-front detection with oceanographic radar based on virtual tsunami observation experiments  [Not invited]
    Kohei Ogata, Ryotaro Fuji, Hirofumi Hinata
    The 4th Ocean Radar Conference for Asia-Pacific  2018/06
  • Verification of Ocean Radar Tsunami Observation of the 2011 Tohoku Tsunami by Numerical Simulation in Ise Bay and Mikawa Bay, Japan  [Not invited]
    Yu Toguchi, Satoshi Fujii, Hirofumi Hinata
    The 4th Ocean Radar Conference for Asia-Pacific  2018/06
  • Examination for moment magnitude of the small tsunami observable by oceanographic radar installed in Wakayama prefecture  [Not invited]
    S. SETO, T. TAKAHASHI, H. HINATA, R. FUJI, F. IMAMURA
    Asia Oceania Geosciences Society 2018  2018/06
  • 広島湾・安芸灘におけるマイクロプラスチックの動態推定  [Not invited]
    佐川奈緒, 日向博文
    土木学会四国支部第24回技術研究発表会  2018/05
  • 別府湾におけるマイクロプラスチックの堆積フラックス  [Not invited]
    桝本 一成, 加 三千宣, 日向 博文
    土木学会四国支部第24回技術研究発表会  2018/05
  • 南海トラフ巨大地震津波発生時の紀伊水道周辺海域におけるエネルギーフラックスの時空間変動特性  [Not invited]
    吉良郁美, 日向博文, 藤良太郎
    土木学会四国支部第24回技術研究発表会  2018/05
  • 仮想津波観測実験に基づく海洋レーダによるリアルタイム津波検知性能の検討  [Not invited]
    尾方浩平, 藤良太郎, 日向博文
    土木学会四国支部第24回技術研究発表会  2018/05
  • 津波シミュレーョンを用いた海洋レーダによる伊勢湾での津波観測の検証  [Not invited]
    渡久地 優, 藤井 智史, 日向 博文
    九州大学 応用力学研究所 研究集会「海洋レーダを用いた海況監視システムの開発と応用」  2017/12
  • 新島和田浜海岸漂着ゴミの1次元岸沖方向拡散係数と砕波帯内における拡散係数の比較  [Not invited]
    宮尾 泰幸, 日向 博文, 片岡 智哉, 曽谷 僚太, 大野 一輝, 森 啓太
    2017年度日本海洋学会秋季大会  2017/10
  • A Study of Real‐Time Detection Distance of Tsunami Arrival Based on Virtual Tsunami Observation Experiments using Numerical Simulation and HF Radar Observation  [Not invited]
    Ryotaro Fuji, Kohei Ogata, Hirofumi Hinata
    International Radiowave Oceanography Workshop  2017/09
  • Temporal Variability of Tsunami Arrival Detection Distance Revealed by Virtual Tsunami Observation Experiments using Numerical Simulation and One‐Month HF Radar Observation  [Not invited]
    Ryotaro Fuji, Hirofumi Hinata
    International Radiowave Oceanography Workshop  2017/09
  • 国内河川におけるマイクロプラスチックの数密度分布特性  [Not invited]
    工藤功貴, 片岡智哉, 二瓶泰雄, 日向博文, 島崎穂波, 馬場大樹
    土木学会平成29年度土木学会全国大会第72回年次学術講演会  2017/09
  • A study of real-time detection distance of tsunami arrival based on virtual tsunami observation experiments using numerical simulation and HF radar observation  [Not invited]
    Ryotaro Fuji, Hirofumi Hinata
    International Tsunami Symposium  2017/08
  • Temporal variability of tsunami arrival detection distance revealed by virtual tsunami observation experiments using numerical simulation and one-month HF radar observation  [Not invited]
    Ryotaro Fuji, Hirofumi Hinata
    International Tsunami Symposium  2017/08
  • Characteristics of Tsunami- Induced Waves and Harbor Oscillations in Ise Bay by Using Oceanographic Radar  [Not invited]
    Yu Toguchi, Satoshi Fujii, Hirofumi Hinata
    International Tsunami Symposium  2017/08
  • 広島湾・安芸灘におけるまいくロプラスチックの動態推定  [Not invited]
    佐川 奈緒, 日向 博文
    土木学会四国支部第23回技術研究発表会  2017/05
  • 新島和田浜海岸におけるマイクロプラスチックの岸沖方向拡散係数の推定  [Not invited]
    大野 一輝, 日向 博文, 宮尾 泰幸, 森 啓太
    土木学会四国支部第23回技術研究発表会  2017/05
  • 仮想津波観測実験に基づく海洋レーダによるリアルタイム津波検知手法の開発  [Not invited]
    尾形 浩平, 藤 良太郎, 日向 博文
    土木学会四国支部第23回技術研究発表会  2017/05
  • 津波シミュレーションを用いた津波・副振動エネルギーの減衰過程に関する研究  [Not invited]
    吉良 郁美, 藤 良太郎, 馬場 崇裕, 日向 博文
    土木学会四国支部第23回技術研究発表会  2017/05
  • A comparison between the 1D diffusion coefficient of beached litters in the cross-shore direction and surf zone diffusivity off Wadahama beach, Nii-jima Island, Japan  [Not invited]
    Yasuyuki Miyao, Hirofumi Hinata, Tomoya Kataoka, Ryota Sodani, Kazuki Ohno, Keita Mori
    JpGU-AGU Joint Meeting 2017  2017/05
  • Observation of Coupled Seiche System in Ise Bay and Mikawa Bay by HF Radar  [Not invited]
    Yu Toguchi, Satoshi Fujii, Hirofumi Hinata
    JpGU-AGU Joint Meeting 2017  2017/05
  • Temporal variability of tsunami detection distance revealed by virtual tsunami observation experiments using HF radar  [Not invited]
    Ryotaro Fuji, Hirofumi Hinata
    JpGU-AGU Joint Meeting 2017  2017/05
  • 海洋レーダ観測による津波到来時の伊勢湾の固有振動モードに関する考察  [Not invited]
    渡久地 優, 藤井 智史, 日向 博文
    海洋レーダを用いた海況監視システムの開発と応用  2016/12
  • Yu Toguchi, Satoshi Fujii, Hirofumi Hinata
    ISAP 2016 - International Symposium on Antennas and Propagation  2016/10 
    © 2016 IEICE. A tsunami generated by 'The 2011 off the Pacific coast of Tohoku Earthquake' was observed by two high frequency ocean surface radars (HF radars) and four tide gauges installed on Ise Bay. The tsunami wave arrived initially at 16:50 was observed by tide gauge which is installed on the mouth of the Bay. This wave propagation was also observed by HF radars installed on the inner part of the Bay. Therefore, these observations were considered to be correlated. The result of spectral analysis, the tsunami wave had energy with period bands of 120-140, 60-90 and 30-40 min. In comparison to the previous study suggest that these 60-90 and 30-40 min periods oscillations were attributed to the tsunami source fault.
  • ビデオカメラモニタリングと粒子追跡法を用いた海浜流観測  [Not invited]
    宮尾 泰幸, 日向 博文, 片岡 智哉
    2016年度年度日本海洋学会秋季大会  2016/09
  • 広島湾・安芸灘におけるマイクロプラスチックの動態推定  [Not invited]
    小澤 史, 日向 博文
    2016年度日本海洋学会秋季大会  2016/09
  • 河川水におけるマイクロプラスチック汚染調査  [Not invited]
    二瓶泰雄, 工藤功貴, 片岡智哉, 日向博文
    2016年度日本海洋学会秋季大会  2016/09
  • 河川水中でのマイクロプラスチック汚染の実態の検討  [Not invited]
    工藤功貴, 二瓶泰雄, 日向博文, 片岡智也
    土木学会平成28年度土木学会全国大会第71回年次学術講演会  2016/09
  • The observation of propagating tsunami wave and response characteristics in IseBay by HF radar  [Not invited]
    Toguchi, Y, Fujii, S, Hinata, H
    the 3rd ocean radar conference for Asia-Pacific  2016/04
  • 森啓太, 山本翼, 日向博文
    日本海洋学会大会講演要旨集  2016/03
  • 片岡智哉, 日向博文, 加藤茂
    日本海洋学会大会講演要旨集  2016/03
  • 片岡智哉, 日向博文
    日本海洋学会大会講演要旨集  2016/03
  • Techniques for quantifying the accumulation of marine debris on beaches  [Not invited]
    Kataoka, T, Kako. S, Murray, C. C, Plybon, C, Murphy T. A, Barnea, N, Hinata, H, Isobe, A
    Workshop on mission concepts for marine debris sensing  2016/01
  • 東北地方太平洋沖地震津波による伊勢湾での応答特性  [Not invited]
    渡久地 優, 藤井 智史, 日向 博文
    海洋レーダを用いた海況監視システムの開発と応用  2015/12
  • 藤良太郎, 藤良太郎, 日向博文, 藤井智史, 片岡智哉, 高橋智幸
    日本海洋学会大会講演要旨集  2015/09
  • 南まさし, 二瓶泰雄, 西島拓駿, 片岡智哉, 日向博文
    土木学会年次学術講演会講演概要集(CD-ROM)  2015/08
  • An automatic and continuous monitoring system for floating-litter transport in river and its application to field survey in Mogami River  [Not invited]
    Minami, M, Onoi, T, Nihei, Y, Kataoka, T, Hinata, H
    the 36th IAHR World Congress  2015/06
  • 片岡智哉, 藤良太郎, 日向博文, 永松宏, 小笠原勇, 伊藤浩之, 高橋智幸
    日本リモートセンシング学会学術講演会論文集  2015/05
  • Numerical experiment on Observation Capabilities of Oceanographic Radar for Far Field Tsunami Off Chile  [Not invited]
    Moe Okamoto, Tomoyuki Takahashi, Shuji Seto, Hirofumi Hinata
    AGU fall meeting  2014/12
  • Sequential monitoring of beach litter at multiple sites using webcams  [Not invited]
    Tomoya Kataoka, Hirofumi Hinata, Shinichiro Kako
    PICES Annual Meeting  2014/10
  • Analysis of a beach as a time-invariant liner input/output system of marine litter  [Not invited]
    Tomoya Kataoka, Hirofumi Hinata
    PICE Annual Meeting  2014/10
  • Inverse estimation of marine-debris outflows using webcam observation data  [Not invited]
    Shin-ichiro Kako, Atsuhiko Isobe, Tomoya Kataoka, Hirofumi Hinata
    PICES Annual Meeting  2014/10
  • Influence of Integration Time on Tsunami Inversion by Oceanographic Surface Radar  [Not invited]
    Ryotaro Fuji, Hirofumi Hinata, Satoshi, Fujii, Tomoyuki Takahashi
    International Tsunami Symposium  2014/09
  • Numerical experiment on far field and near field tsunamis concerning Oceanographic Radar observation  [Not invited]
    M. OKAMOTO, S. SETO, T. TAKAHASHI, H. HINATA
    Ocean Sciences Meeting  2014/02
  • Influence of Integration Time on the Accuracy of Estimation of Tsunami Initial Sea Surface Elevation Based on Inversion using Oceanographic Radar  [Not invited]
    Ryotaro Fuji, Hirofumi Hinata, Tomoyuki Takahashi
    Ocean Science Meeting  2014/02
  • Exponential Decay of Remnants of Plastic Litter through an Advection-Diffusion Process on Wadahama Beach, Niijima Island, Japan  [Not invited]
    Tomoya Kataoka, Hirofumi Hinata
    Ocean Science Meeting  2014/02
  • Beach as a linear system of marine debris input  [Not invited]
    Tomoya Kataoka, Hirofumi Hinata, Shigeru Kato
    Estuarine & Coastal Sciences Association (ECSA) Conference  2013/10
  • Velocity Fields of Propagating Tsunami Wave and Subsequent Resonant Oscillation Revealed by Oceanographic Radars in the Kii Channel, Japan  [Not invited]
    Hirofumi Hinata, Ryotaro Fuji, Satoshi Fujii, Tomoyuki Takahashi
    International Tsunami Symposium  2013/09
  • Simultaneous monitoring at multiple sites of beached plastic litter quantity using webcam  [Not invited]
    Tomoya Kataoka, Hirofumi Hinata, Shinichiro Kako
    PICES Annual Meeting  2012/10
  • Numerical Estimation of Floating Macro-debris Inflow Flux into Tokyo Bay  [Not invited]
    Tomoya Kataoka, Yasuo Nihei, Hirofumi Hinata
    Estuarine & Coastal Sciences Association (ECSA) Conference  2012/06
  • A new technique for detecting beached color plastic debris from webcam images using CIELUV  [Not invited]
    Tomoya Kataoka, Hirofumi Hinata, Shinichiro Kako
    Estuarine & Coastal Sciences Association (ECSA) Conference  2012/06
  • Hiroshi Yagi, Hirofumi Hinata, Kazuo Nadaoka
    Proceedings of the Coastal Engineering Conference  1997/01 
    To investigate the characteristics of flow field in the coastal buffer zone (C.B.Z.), velocity measurements in a field were performed both in non-stratified and stratified conditions. The results of the data analysis have shown that in the non-stratified condition wind action, together with tidal motion, may induce unexpectedly large velocity even near the bottom with the magnitude beyond the threshold of the sediment movement, suggesting that the appreciable sediment transport may be caused by these wind-driven currents in C.B.Z.. In the stratified condition, it is revealed that internal tides with baroclinic velocity fluctuation may dominate the cross-shore exchanging motion of water mass.

Works

  • Guidelines for Harmonizing Ocean Surface Microplastic Monitoring Methods
    Michida et 2019/05

MISC

Awards & Honors

  • 2018/05 土木学会四国支部 研究・論文賞
     仮装津波観測実験に基づく海洋レーダによるリアルタイム津波検知手法の開発 
    受賞者: 尾方 浩平;藤 良太郎;日向 博文
  • 2013/05 公益社団法人 日本港湾協会 論文賞
     
    受賞者: 日向 博文
  • 2001 土木学会論文奨励賞
     JPN

Research Grants & Projects

  • 環境省：環境総合研究推進費
    Date (from‐to) : 2018/04 -2021/03 
    Author : 日向 博文, サブテーマリーダー
  • 仮想津波観測実験に基づく海洋レーダ津波計測性能検証と津波防災への展開
    日本学術振興会：科学研究費
    Date (from‐to) : 2016/04 -2019/03 
    Author : 日向 博文
  • 沿岸から大洋を漂流するマイクロプラスチックスの動態解明と環境リスク評価
    環境省：環境研究総合推進費
    Date (from‐to) : 2015/04 -2018/03 
    Author : 磯辺 篤彦
  • 全球プラスチック漂着ゴミ量把握に向けた人工衛星画像解析アルゴリズムの開発
    日本学術振興会：科学研究費
    Date (from‐to) : 2014/04 -2016/03 
    Author : 日向 博文
  • 砂浜海岸におけるプラスチック漂着ゴミの滞留時間モデルの開発
    日本学術振興会：科学研究費
    Date (from‐to) : 2013/04 -2016/03 
    Author : 片岡 智哉
  • 陸上設置型遠距離津波レーダ開発に基づく津波初期波形の直接計測
    三菱財団：研究助成（自然科学）
    Date (from‐to) : 2013/10 -2014/09 
    Author : 日向 博文
  • 東日本大震災を踏まえた観測およびシミュレーションが連携した津波減災技術の開発
    関西大学：研究拠点形成支援経費
    Date (from‐to) : 2012/04 -2014/03 
    Author : 高橋智幸
  • 近赤外同時多点分光技術を利用した次世代漂着ゴミ連続モニタリングシステム
    日本学術振興会：科学研究費
    Date (from‐to) : 2011/04 -2013/03 
    Author : 日向 博文
  • 海ゴミによる化学汚染物質輸送の実態解明とリスク低減に向けた戦略的環境教育の展開
    地球環境研究推進費
    Date (from‐to) : 2010/04 -2013/03 
    Author : 磯辺 篤彦
  • （４）市民と研究者が協働する東シナ海沿岸における海岸漂着ゴミ予報実験
    環境省：地球環境研究総合推進費
    Date (from‐to) : 2007/04 -2010/03 
    Author : 磯辺 篤彦
  • Marine debris prediction experiment in East China Sea
    Global Environment Research Fund
    Date (from‐to) : 2007 -2009
  • Wind-driven current in coastal oceans
    Date (from‐to) : 2007
  • 東京湾における総合的な環境管理・予測システムに関する基礎的研究
    運輸施設整備事業団：基礎的研究推進制度
    Date (from‐to) : 2000/04 -2003/03 
    Author : 細川恭史
  • （６）外洋物理機構を考慮した東京湾海水交換メカニズムの解明
    日本学術振興会：科学研究費
    Date (from‐to) : 1997/04 -1999/03 
    Author : 日向 博文
  • Effects of Kuroshio Current variability on castal sea environments
    Date (from‐to) : 1998

愛媛大学教員活動実績

教育活動(B)

担当授業科目(B01)

  • 2019, the first semester, under graduate, 環境学入門
  • 2019, the first semester, under graduate, 環境学入門
  • 2019, the first semester, under graduate, 建設倫理
  • 2019, the first semester, under graduate, 海岸工学

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