Search Results 1-20 of 50

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  • Relationship between Concentration of Organo-tin Compounds Contained in Bottom Sediments and Sediment Mixtures Caused by Tsunami in Bay on Sanriku Coast  [in Japanese]

    Yakushiji Yuki , Komatsu Kosei

    … This study aims to elucidate the horizontal and vertical distribution of residual organo-tin compounds in bottom sediments in Otsuchi Bay, a main semi-closed bay on the Sanriku coast. … For this purpose, bottom-sediment core sampling was conducted at multiple stations in this bay. …

    Marine Engineering 54(6), 875-878, 2019

    J-STAGE 

  • Observation and Hydrodynamic Simulation of Tidal Current and Seawater Exchange in the Kesennuma Bay, Northeastern Japan

    SHIBASAKI Reo , SHINTANI Tetsuya , FUKUSHIMA Keitaro , KOBAYASHI Masayuki , YOKOYAMA Katsuhide

    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_631-636, 2018

  • Observation and Hydrodynamic Simulation of Tidal Current and Seawater Exchange in the Kesennuma Bay, Northeastern Japan  [in Japanese]

    SHIBASAKI Reo , SHINTANI Tetsuya , FUKUSHIMA Keitaro , KOBAYASHI Masayuki , YOKOYAMA Katsuhide

    …  We observed the seawater flow pattern during the ebb and flood tide in the Kesennuma Bay, northeastern Japan, using towing and bottom-mounted ADCPs. … The observed data indicated that the eastern bay had a large flow rate compared to the western bay. … in the northern part of the western bay, and the flow was prevailing through the narrow channel called Oshima-Seto to east. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_631-I_636, 2018

    J-STAGE 

  • NUMERICAL EVALUATION OF CARRYING CAPACITY OF AQUACULTURE IN SHIZUGAWA BAY USING LAND-SEA INTEGRATED ECOSYSTEM MODEL  [in Japanese]

    YAMAMOTO Hironori , YOSHIKI Kengo , KOMATSU Teruhisa , SASA Syuji , YANAGI Tetsuo

    志津川湾はカキ,ワカメ,ホタテガイ,ホヤ,ギンザケの養殖が盛んな海域であるが,東日本大震災の津波により養殖施設がほぼ全損し現在も復旧途上にある.本研究では,志津川湾流域の土地利用変化に伴う流入負荷量の変化を組み込んだ陸域-海域統合数値モデルを構築し,漁業者の収益や海域の生産性を損なうことなく,環境への負荷も少ない将来の最適養殖量の解析を行った.その結果,カキ養殖筏の台数を震災前の約1/3で維持し, …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_1279-I_1284, 2018

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  • NUMERICAL EVALUATION OF ENVIRONMENTAL CAPACITY OF AQUACULTURE IN SHIZUGAWA BAY - Comparison before and after the Great East Japan Earthquake -  [in Japanese]

    YAMAMOTO Hironori , YOSHIKI Kengo , KOMATSU Teruhisa , SASA Syuji , HAMANA Masahiro , MURATA Hiroki , YANAGI Tetsuo

    宮城県北東部の志津川湾はカキ,ワカメ,ホタテガイ,ホヤ,ギンザケの養殖が盛んな海域であるが,東日本大震災の津波により養殖施設がほぼ全損し現在も復旧途上にある.本研究は,志津川湾で行われているこれらの養殖を考慮した数値モデルを構築し,震災前と現在の養殖形態の変化が,志津川湾で最も水揚げ量の多いカキの成長や水揚げ量,水質へ及ぼす影響等について解析を行った.その結果,カキ養殖筏の台数を震災前の1/3に削 …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 73(2), I_1339-I_1344, 2017

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  • The transfer of photosynthetic sulfur bacteria-derived organic matter to the organisms at a higher trophic level at a semi-closed bay  [in Japanese]

    市川 好貴 , 梅澤 有 , 山喜 邦次 , 島塚 桃子 , 和田 実

    … Hypoxic water mass often formed in semi-closed bay during summer causes mass death events of the benthic organisms due to anoxic water at the bottom layer. … On the other hand, autotrophic bacteria which proliferate in the anoxic condition may partially contribute to biological production in the bay, as food source for the heterotrophs inhabiting outside the hypoxic water mass. …

    長崎大学水産学部研究報告 (97), 11-17, 2016-03

    IR 

  • Multi-element geochemical analysis of water quality, suspended solid, sediments and Zostera marina for evaluation of the tidal flat environment in Matsunaga Bay and surrounding areas in Bingo Nada of Seto Inland Sea, Japan  [in Japanese]

    Okamoto Rikako , Yamashita Mizuki , Sakaya Megumi

    … The Seto Inland Sea is characterized by the semi-closed marine environment, composed of several seas called Nada or Wan. … This study focused on an evaluation of marine environment in the Matsunaga Bay and surrounding areas in Bingo Nada. … Twenty sediment samples were collected at the tidal flat of the Matsunaga Bay and 15 samples in Utsumi island (south of Matsunaga Bay), and 6 samples in Momoshima island were collected. …

    島根大学地球資源環境学研究報告 = Geocience reports of Shimane University (33), 59-74, 2015-02

    IR 

  • Distribution of the invasive ascidian <i>Ascidiella aspersa</i> (Müller, 1776) (Urochordata, Ascidiacea) in Hokkaido, Japan

    KANAMORI Makoto , BABA Katsuhisa , KONDA Yasuko , GOSHIMA Seiji

    … (Müller, 1776) was reported for the first time in Funka Bay, Hokkaido, Japan, and it has since caused serious damage to the cultured scallop industry in the bay. … attached to cultured scallops was investigated at 10 stations near Funka Bay in October 2012 and 2013. … was found at all the stations near Funka Bay, and the number of <i>A. … on scallops was much greater inside the bay than outside of the bay. …

    Japanese Journal of Benthology 69(1), 23-31, 2014

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  • Long-term observations of iron-oxyhydroxide-rich reddish-brown water in Nagahama Bay, Satsuma Iwo-Jima Island, Kagoshima, Japan

    … Nagahama Bay, in the southern part of Satsuma Iwo-Jima Island (38 km south of Kyushu Island, Japan), contains an active hydrothermal system along the beach and at the fishing port. … The construction of a breakwater around the bay has resulted in a semi-closed body of water with an entrance from the south. … From this bay, reddish-brown seawater enriched in iron-oxyhydroxides is discharged to the Pacific Ocean constantly. …

    九州大学大学院理学研究院紀要 : Series D, Earth and planetary sciences 32(4), 45-52, 2012-03-01

    IR 

  • MAXIMUM WAVE HEIGHT DISTRIBUTIONS IN THE SETO INLAND SEA INDUCED BY BIG TYPHOONS DURING A YEAR PERIOD OF 1918-2005  [in Japanese]

    HATADA Yoshio , YAMAGUCHI Masataka , NONAKA Hirokazu

    本論文では瀬戸内海の東部・中部・西部海域で1918~2005年の間に抽出した26ケースの巨大台風(1918年7月台風から台風0418号まで)を対象とした浅海波浪推算の結果に基づいて,各台風時の最大波高と波向の空間分布の特性を検討する.入力条件とした海上風分布は対象海域周辺の陸上気象官署で取得されたSDP風の沿岸・海上観測風への変換とそれらの空間補間による.波高は,太平洋に接続する豊後水道や紀伊水道 …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 68(2), I_983-I_988, 2012

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  • TOPOGRAPHY CHANGE OF NATURAL BEACH IN SEMI-CLOSED WATER AREA  [in Japanese]

    UNO Kohji , SUGANO Takuma , TSUJIMOTO Gozo , KAKINOKI Tetsuya

    本研究では,兵庫県西宮市の御前浜を研究対象に,地形改変や航走波といった都市閉鎖性水域独自の外力が自然砂浜の地形変化や流動場へ与える影響について,現地調査,画像解析,数値シミュレーションを通じて検討した.その結果,御前浜では,戦後の埋め立て造成により極めて静穏な空間となり,過去50年間にわたり砂浜面積に大きな変化は見られなかった.このような都市部の閉鎖性の強い水域では,船舶通過によって生じた航走波が …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 67(2), I_358-I_363, 2011

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  • Numerical simulations of tidal currents in the Ariake Sea coastal waters by considering nori aquafarming grounds  [in Japanese]

    田畑 俊範 , 平松 和昭 , 原田 昌佳 , Tabata Toshinori , Hiramatsu Kazuaki , Harada Masayoshi

    近年、有明海環境異変が懸念され社会問題にまで発展している。有明海は、九州西部に位置し深く入り込んだ閉鎖性の高い九州最大の内湾である。日本最大の潮位差と豊かな干潟を有し、二枚貝を始めとした水産資源が豊富であり、冬季には湾奥部干潟域を中心として広大な海域でノリ養殖が行われている。有明海環境異変とは、二枚貝を中心とする豊かな漁業生産量の減少とノリ養殖生産量の不安定化であり、その要因としては、干潟面積の減 …

    Science bulletin of the Faculty of Agriculture, Kyushu University 65(2), 57-72, 2010-10

    IR  DOI  JASI 

  • The Examination of the Environmental Regeneration Policy of the Sea Area from a Comprehensive Viewpoint Including the Land Area:From Sensitivity Analysis of Material Cycles on the Outbreak of the Oxygen Deficient Water in the Mikawa Bay  [in Japanese]

    KISHIDA Hiroyuki , FUJITA Koichi , MOCHIZUKI Takafumi , ORO Takeshi , KUBOTA Hajime , KOJIMA Fujio , KAMIOKA Seiji

    国土技術政策総合研究所では、健全な水域環境回復に向けた、陸域から沿岸海域にわたる広域的な視点からの、栄養塩類等の物質循環管理の目標設定と施策検討の枠組みの提案を目指した研究を、総合的なプロジェクトとして実施した。複雑で多分野にわたる現象について包括的な検討を行うために、各研究機関・チーム等と連携し研究戦略WGを組織し、また、三河湾を管理する各行政機関とも情報交換を密にして成果の活用先を明確にしつつ …

    Journal of Fisheries Engineering 46(3), 211-215, 2010

    J-STAGE  JASI 

  • Performance of a Water Chamber Type Seawall for Vertical Mixing in a Density Stratified Field

    SAEKI Shinya , NAKAMURA Takayuki , OKADA Shuuhei

    Performance of a water chamber type seawall that aims sea water mixing and diffusion in the vertical direction has been examined experimentally. Especially, effectiveness of the seawall in a density s …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 65(1), 796-800, 2009

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  • A case study of mitigation in Mishima area of Hakata bay, Fukuoka  [in Japanese]

    BABASAKI Masahiro , HACHIYAMA Hiroshi , UCHIDA Tadashi , SHIMATANI Yukihiro

    Kankyo asesumento gakkaishi 7(1), 84-91, 2009

  • IMPACT OF THE ACTUAL SEA SURFACE TEMPERATURE OF TOKYO BAY ON URBAN AIR TEMPERATURE

    ODA Ryoko , KANDA Manabu , MORIWAKI Ryo , YAMADA Tadashi

    … To investigate the impact of the actual sea surface temperature (SST) of Tokyo Bay on urban air temperature, an observation network was constructed. … SST had been measured at 14 observation sites, such as the lighted buoy in Tokyo Bay since November 2006 to September 2007, and urban air temperature was simulated using the numerical modeling system, WRF, in which SST obtained from this observation was used. …

    PROCEEDINGS OF HYDRAULIC ENGINEERING (52), 283-288, 2008

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  • A LOW REFLECTIVE DIKE STRUCTURE WITH VERTICAL MIXING FUNCTIONS BY THE USE OF WAVE INDUCED VORTEX FLOWS  [in Japanese]

    SAEKI Shinya , NAKAMURA Takayuki

    … In this study, a low reflective dike that aims sea water mixing and diffusion along the vertical direction in a semiclosed bay is intended for development through the use of wave energy as a driving force. …

    PROCEEDINGS OF CIVIL ENGINEERING IN THE OCEAN (24), 573-578, 2008

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  • Reanalysis of past major storms in West Kyushu and study of wind-induced currents in Ariake Sea

    Lee Han Soo , Yamashita Takao , Komaguchi Tomoaki

    … The results of reanalysis had been utilized for a database construction and studies of wind field characteristics in semi-closed Omura Bay. …

    Journal of international development and cooperation 14(2), 19-36, 2008

    IR  DOI 

  • A Numerical Study on the Effects of External Loading of Materials on the Ecosystem in Tokyo Bay  [in Japanese]

    Kitazawa Daisuke , Tabeta Shigeru

    閉鎖性内湾である東京湾を対象として、陸域からの物質負荷量の変化に伴う生態系の変化を数値シミュレーションにより解析した。数値シミュレーションモデルは、流体力学モデルと生態系モデルとから構成され、物理パラメータや生態系パラメータは、1991~1998年の平均的な水質観測結果を用いてキャリブレーションが行われた。また、陸域からの物質負荷量は、東京湾沿岸域の人間活動や今後予定されている物質負荷量の総量規制 …

    NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan 56(0), 99-99, 2007

    J-STAGE 

  • Development of a Vertical Mixing Enhancement Breakwater using Piston Mode Wave Resonance in the Water Chamber

    SAEKI Shinya , NAKAMURA Takayuki

    … In this study, an offshore facility that aims sea water mixing and diffusion along the vertical direction in a semi-closed bay is intended for development through the use of wave energy as a driving force.A water chamber type dike comprised of a row of vertical walls of different drafts and a submerged horizontal plate was proposed as a typical structure in order to be able to utilize piston mode wave resonances and resultant vortex generations for the effective vertical mixing. …

    PROCEEDINGS OF COASTAL ENGINEERING, JSCE (54), 1241-1245, 2007

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