Search Results 1-20 of 138

  • Research on monitoring of ripcurrent occurrence based on cooperation of multiple drones  [in Japanese]

    TOKUMARU Syunya , KAMIYAMA Juichi , FUKUMOTO Shinya , KASHIMA Masayuki , WATANABE Mutsumi , KAKINUMA Taro , TANEDA Tetsuya

    … First, UAV detects areas where rip currents are occurring. … Next, Inspecting the rip current region by USV and conducting a flow survey. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2020(0), 2P1-N14, 2020

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  • FIELD OBSERVATION OF RIP CURRENT ON NATURAL BEACH OF KASHIWAKUMA COAST FACING KASHIMANADA SEA  [in Japanese]

    UDA Takaaki , KAWAMATA Masashi , KIKUCHI Shogo , OHTANI Yasuro , NAKAMURA Asuto

    … <p> In the previous studies, the development of nearshore currents and a rip current in the vicinity of an artificial headland has been observed on the Kashiwakuma coast facing the Pacific Ocean by tracking floats attached with a small GPS and photographing by UAV. … The development of a rip current on a natural beach, however, has not yet been observed on this coast. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 76(2), I_73-I_78, 2020

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  • INVESTIGATION OF SUITABLE ANALYSIS PERIOD OF TIME FOR IMAGE AVERAGING TO DETECT RIP CURRENT  [in Japanese]

    SHIMADA Ryo , ISHIKAWA Toshinori , KOMINE Tsutomu

    … <p> In Japan, the main cause of drowning accidents are rip currents which account for more than 40 percent of the natural factors of drowning. … This is because almost all beach users cannot recognize the rip current areas. … On the other hand, an analysis of image averaging using consecutive photo data can research the rip current over a long period of time, but it requires a huge amount of image data. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 76(2), I_1339-I_1344, 2020

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  • SURVEY AND SIMULATION ABOUT CURRENT INFORMATION AROUND OFFSHORE BREAKWATER AT ZENIBAKO BEACH  [in Japanese]

    INUKAI Naoyuki , MINAMIHARA Mitsuru , ABE Jun , KIMURA Takahiko , SUZUKI Naoko , SAITO Hiroki , SAITO Hidetoshi

    … At the field survey, we used ADCP, and we got the water depth information and the current information. … Thirdly, we made the numerical simulation about the wind driven current in Ishikari Bay, and about the wave and the wave current around Zenibako Beach. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 76(2), I_1183-I_1188, 2020

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  • ANALYSIYS OF TOPOGRAPHIC AND CURRENT INFORMATION AROUND OFFSHORE BREAKWATER AT ZENIBAKO BEACH IN HOKKAIDO  [in Japanese]

    INUKAI Naoyuki , ABE Jun , KIMURA Takahiko , SUZUKI Naoko , SAITO Hiroki , USHO Katsumi , KISHI Hiroaki , SAITO Hidetoshi

    … At the field survey, we got the topographic information and current information due to use ADCP. … During field survey, we pigmented the rip current by the sea water colorant, and the pigmented current was recorded as the aerial photography by the UAV. … The photographed were used to make grid topographic data and calculated the average current velocity. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 76(2), I_708-I_713, 2020

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  • ANALYSIS OF RELATIONSHIP BETWEEN NUMBER OF BEACH USERS AND PROBABILITY OF BEACH USER'S ENTRANCE INTO RIP AREA USING AI  [in Japanese]

    SHIMADA Ryo , ISHIKAWA Toshinori , KOMINE Tsutomu

    … On the other hand, the main factor of outbreak drowning is the rip current, however, the relationship between an increase or decrease in the number of beach users and their entering the rip current areas that cause drowning accidents is not investigated. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 76(2), I_1031-I_1036, 2020

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  • Detection of Current-rips (shiome) Using PALSAR/PALSAR-2

    ISOGUCHI Osamu , EBUCHI Naoto

    … The positions and strengths of the SAR line-shaped bright patterns generally correspond with those of current shear, suggesting a general theory that convergence areas induced by large current shear are imaged bright through the modulation of ocean surface roughness. … The SAR-derived line-shaped bright pattern thus indicates current-rips (Shiome) characterized physically as the convergence of surface currents. …

    Journal of The Remote Sensing Society of Japan 40(Supplement), S1-S11, 2020

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  • FIELD OBSERVATION OF NEARSHORE CURRENT USING GPS FLOATS AND DYED TRACER ON KASHIMANADA COAST  [in Japanese]

    宇多 高明 , 大谷 靖郎 , 永沼 慎吾 , 菊池 正悟 , 大木 康弘 , 中村 明日人

    土木学会論文集. B2, 海岸工学 Journal of Japan Society of Civil Engineers. 土木学会海岸工学委員会 編 75(2), I_181-186, 2019

  • VERIFICATION OF DETECTION OF RIP CURRENT USING AI  [in Japanese]

    石川 仁憲 , 佐藤 嘉亮 , 島田 良 , 小峯 力

    土木学会論文集. B2, 海岸工学 Journal of Japan Society of Civil Engineers. 土木学会海岸工学委員会 編 75(2), I_175-180, 2019

  • OBSERVATION OF NEARSHORE TOPOGRAPHY AND CURRENT IN SURF ZONE USING WEB CAMERAS  [in Japanese]

    UDA Takaaki , OOKI Yasuhiro , NAGANUMA Shingo , KIKUCHI Shingo , OHTANI Yasuro , SAN-NAMI Toshiro , ICHIMURA Yasu

    … <p> Locally-formed troughs in the surf zone, which cannot be recognized by ordinary people, and troughs which are related to the formation of longshore and rip currents, were measured using two web cameras. … It was found that web cameras were useful for the observation of the nearshore topography and nearshore current.</p> …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_85-I_90, 2019

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  • VERIFICATION OF DETECTION OF RIP CURRENT USING AI  [in Japanese]

    ISHIKAWA Toshinori , SATO Yoshiaki , SHIMADA Ryo , KOMINE Tsutomu

    … Also, almost all drowning accidents are caused by the rip current. … In order to reduce the rip current accidents, new rip current safety is required. … Therefore, we developed a new technology that can detect the rip current and notify beach users and lifesavers using the Internet of Things (IoT) and the Artificial Intelligence (AI). …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_175-I_180, 2019

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  • FIELD OBSERVATION OF NEARSHORE CURRENT USING GPS FLOATS AND DYED TRACER ON KASHIMANADA COAST  [in Japanese]

    UDA Takaaki , OHTANI Yasuro , NAGANUMA Shingo , KIKUCHI Shogo , OOKI Yasuhiro , NAKAMURA Asuto

    … Because artificial headlands have been constructed at both ends of Katsushita area, nearshore current was affected by the headlands, inducing a rip current. … Observation results showed that northward longshore current developed well in both areas, and the longshore current was blocked by the headlands, causing strong rip current of a velocity over 1 m/s near the headlands. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_181-I_186, 2019

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  • THE IMPROVEMENT OF RISK MANAGEMENT AWARENESS BY VISUALIZED RIP CURRENT AMONG BEACH USERS  [in Japanese]

    ENDO Shintaro , SHIMOIDA Haruka , ISHIKAWA Toshinori , KOMINE Tsutomu

    … <p> Almost all drowning accidents were caused by the rip current in Japan. … In order to prevent rip current accidents, lifesavers inform beach users by an announcement, and flags and signboards. … However, rip current accidents have not decreased because beach users can't perceive the place of occurrence and don't understand the risk. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 75(2), I_701-I_706, 2019

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  • OUTBREAK FACTORS OF RIP CURRENT ACCIDENT AT ONJUKU BREACH IN JAPAN  [in Japanese]

    SHIMADA Ryo , ISHIKAWA Toshinori , KOMINE Tsutomu

    … <p> The rip current is a main cause of drowning accidents in Japan. … To prevent drowning accidents, lifesavers detect the rip current, and give a caution to beach users. … However, rip current accidents are not prevented completely because of not only difficulty of finding rip currents, but also the lack number of lifesavers compared with total number of beach users. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 75(2), I_695-I_700, 2019

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  • A STUDY ON BEHAVIOR OF WAVE IN POCKET BEACH LOCATED AT BASE OF PENINSULA  [in Japanese]

    INUKAI Naoyuki , TAKAHASHI Naoki , SAITO Hidetoshi , ABE Jun , KIMURA Takahiko , SHINNISHI Michihiro , YUFU Kentaro

    <p> Koga beach is located in the north of Kyushu. This beach is a pocket beach and this has the groins at the both ends of the beach, furthermore there is a submerged breakwater at the offshore …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 75(2), I_259-I_264, 2019

    J-STAGE 

  • STUDY ON CURRENT CONDITION OF RIP CURRENT IN SANDY BEACH  [in Japanese]

    犬飼 直之 , 山下 晃史 , 山本 浩

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE 63, I_589-594, 2018

  • STUDY ON GRASP OF CURRENT CONDITION OF THE RIP CURRENT TO OCCURS IN SANDY BEACH  [in Japanese]

    犬飼 直之 , 山下 晃史 , 山本 浩

    土木学会論文集. B2, 海岸工学 Journal of Japan Society of Civil Engineers. 土木学会海岸工学委員会 編 74(2), I_1411-1416, 2018

  • A STUDY ON WIND DRIVEN CURRENT AND NEARSHORE CURRENT AT ISHIKARI-HAMA BEACH  [in Japanese]

    犬飼 直之 , 品田 啓太

    土木学会論文集. B2, 海岸工学 Journal of Japan Society of Civil Engineers. 土木学会海岸工学委員会 編 74(2), I_571-576, 2018

  • FIELD INVESTIGATION OF RIP CURRENT ON HOKOTA COAST FACING KASHIMANADA SEA  [in Japanese]

    宇多 高明 , 大谷 靖郎 , 永沼 慎吾 , 大崎 康弘 , 大木 康弘 , 中村 明日人

    土木学会論文集. B2, 海岸工学 Journal of Japan Society of Civil Engineers. 土木学会海岸工学委員会 編 74(2), I_97-102, 2018

  • FIELD OBSERVATION OF LONGSHORE AND RIP CURRENT USING IMAGERIES OF WEB CAMERA INSTALLED ON HOKOTA COAST  [in Japanese]

    大谷 靖郎 , 宇多 高明 , 大崎 康弘 , 永沼 慎吾 , 三波 俊郎 , 大木 康弘 , 市村 康

    土木学会論文集. B2, 海岸工学 Journal of Japan Society of Civil Engineers. 土木学会海岸工学委員会 編 74(2), I_91-96, 2018

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