Search Results 1-20 of 121

  • MEASURES AGAINST EROSION ON HOKOTA COAST FACING KASHIMANADA SEA  [in Japanese]

    菊地 正悟 , 川又 雅史 , 宇多 高明 , 大谷 靖郎 , 芹沢 真澄

    土木学会論文集. B2, 海岸工学 Journal of Japan Society of Civil Engineers. Series B2, Coastal engineering 76(2), Ⅰ_559-564, 2020

  • MEASURES AGAINST EROSION ON HOKOTA COAST FACING KASHIMANADA SEA  [in Japanese]

    KIKUCHI Shogo , KAWAMATA Masashi , UDA Takaaki , OHTANI Yasuro , SERIZAWA Masumi

    … With reference to the case in which beach changes after 30 years from the present were predicted with no measures, 7 cases of calculation were carried out while changing the arrangement of an artificial headland, the volume of sand back pass and beach nourishment using coarse sand, and compared with each other. … The most appropriate method was a combination of the construction of an artificial headland and sand back pass.</p> …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 76(2), I_559-I_564, 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. …

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

  • 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

    … They were installed between artificial headland Nos. 29 and 30 on the Hokota coast, facing the Pacific Ocean and imageries were taken simultaneously. …

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

    … Then, this rip current passed the tip of the headlands, forming the separation zone of the current immediately north of the headland.</p> …

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

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  • BEACH EROSION AND TSUNAMI COUNTERMEASURE DOWNCOAST OF ARTIFICIAL HEADLAND NO. 12 ON HORIKAWA BEACH ON KUJUKURI COAST  [in Japanese]

    UDA Takaaki , KOBAYASHI Akio , YOKOTA Takuya

    … <p> The relationship between countermeasures against beach erosion and tsunami was investigated, taking the area around the artificial headland No. 12 on Horikawa Beach located in the north part of the Kujukuri coast as an example. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 75(2), I_647-I_652, 2019

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  • FIELD INVESTIGATION OF SEACLIFF EROSION AT POINT HIGASHIHENNA-ZAKI EXTENDING AT SOUTHEAST END OF MIYAKO ISLAND  [in Japanese]

    UDA Takaaki , ANDO Shohei , MORITA Akihiro , GUSHIKEN Yoshio , IGARASHI Tatsuyuki , OOKI Yasuhiro , SUGAHARA Kentaro , GOMI Hisaaki

    … To investigate the mechanism, oblique aerial aphotographs of the rocky cliffs were taken using a drone on October 2017 as well as the investigation of the crack formed on the surface of the headland. … Regarding the main external force to force the collapse of the rocky cliff, wave gages were installed at three points near the reef edge offshore of the headland between October 18 and November 19, 2017. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 75(2), I_611-I_616, 2019

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  • EFFECTS ANALYSIS OF HEADLAND AND ARTIFICIAL REEF FOR NOURISHMENT AT KIN-EICHO COAST, NIIGATA  [in Japanese]

    二階堂 竜司 , 五十嵐 雄介 , 小山 英夫 , 中園 大介 , 原 文宏 , 土井 康義

    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_955-960, 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

  • DEVELOPMENT OF PREDICTIVE MODEL OF BEACH CHANGES CONSIDERING NOT ONLY LOCAL COAST BUT ALSO BALANCE IN LITTORAL CELL  [in Japanese]

    ISHIKAWA Toshinori , UDA Takaaki , FURUIKE Kou , HOSOKAWA Jyun-ichi , TAKO Tetsuyuki

    …  After selecting a 6-km stretch of the coast between the Yanagishima coast and a location 2.8 km east of Chigasaki artificial headland, beach changes were predicted using the BG model. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_883-I_888, 2018

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

    OHTANI Yasuro , UDA Takaaki , OSAKI Yasuhiro , NAGANUMA Shingo , SAN-NAMI Toshiro , OOKI Yasuhiro , ICHIMURA Yasushi

    …  The method developed by Lippmann and Halman, in which the imageries taken by a video or web camera are employed to observe water depth in the surf zone and the formation of a bar and trough, was applied to the observation around No. 29 artificial headland on the Hokota coast facing the Pacific Ocean. … Furthermore, it was found that a rip current always develops along the north side of No. 29 artificial headland because of its wave-sheltering effect. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_91-I_96, 2018

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  • EFFECTS ANALYSIS OF HEADLAND AND ARTIFICIAL REEF FOR NOURISHMENT AT KIN-EICHO COAST, NIIGATA  [in Japanese]

    NIKAIDO Ryuji , IGARASHI Yusuke , KOYAMA Hideo , NAKAZONO Daisuke , HARA Fumihiro , DOI Yasuyoshi

     In Kin-eicho coast of Niigata Prefecture, the statically stable beach method with artificial reefs and headlands was applied because longshore sediment transport for this coast can’t be ex …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_955-I_960, 2018

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

    UDA Takaaki , OHTANI Yasuro , NAGANUMA Shingo , OSAKI Yasuhiro , OOKI Yasuhiro , NAKAMURA Asuto

    … Also, photographs were taken using a drone from an elevation of 150 m above the surf zone together with tracing floats with a small GPS, which were thrown into the surf zone near No. 29 artificial headland. … It was concluded that the development of rip currents in the area between artificial headland Nos. 29 and 30, and stationary development of rip current near No. 29 HL were successfully explained by numerical simulation. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_97-I_102, 2018

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  • CONSIDERATION OF SIZE AND SHAPE OF ARTIFICIAL HEADLANDS IN KOCHI COAST CONSIDERING CROSS-SHORE SEDIMENT TRANSPORT  [in Japanese]

    TOMINAGA Takefumi , KAKEHI Yasumasa , ITOU Sadakazu , OYA Yoshiyuki , IWASA Takahiro , MIYASHITA Takuya

     This research is to design the coastal structures in Kochi Coast where cross-shore sediment transportation is dominant. Cross-shore sediment transportation induced by high waves and current flow …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 73(2), I_553-I_558, 2017

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  • Multidecadal Shoreline Change on the Hasaki Coast  [in Japanese]

    伴野 雅之 , 栗山 善昭 , 武若 聡

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute (1316), 2-31, 2016-03

  • BEACH CHANGES CAUSED BY IMBALANCE IN SAND BUDGET AND MANAGEMENT  [in Japanese]

    UDA Takaaki , SAN-NAMI Toshiro , TAKAHASHI Ko-ichi , TAKO Tetsuyuki , ISHIKAWA Toshinori

    …  On the Shonan coast, the reduction of a river mouth terrace offshore of the Sagami River and the shoreline recession downcoast of an artificial headland and Chigasaki fishing port breakwater have occurred owing to the imbalance in sand budget, causing several unsolved issues. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72(2), I_751-I_756, 2016

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  • EFFECT AND LIMITATION OF ARTIFICIAL HEADLAND AS A MEASURE AGAINST EROSION  [in Japanese]

    UDA Takaaki , IGARASHI Tatsuyuki , OHTANI Yasuro , OOKI Yasuhiro

     Artificial headlands (HLs) have been constructed to reduce longshore sand transport. However, part of longshore sand transport could be transported downcoast turning around the tip of the HLs, b …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 71(2), I_742-I_747, 2015

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