Search Results 1-20 of 227

  • A Study of Calculation Conditions of Data Assimilation for Flow Analysis of Closed Waters by Ensemble Kalman Filter  [in Japanese]

    松崎 義孝 , 井上 徹教

    港湾空港技術研究所資料 = Technical note of the Port and Airport Research Institute (1367), 1-35, 2020-02

  • Biomonitoring PAHs pollution in the coastal sediments of the Bohai Bay, China  [in Japanese]

    DONG Wenjing , BAI Binrong , MU Jingli , PEI Desheng , ZHENG Na , XIE Lingtian , YANG Jingfeng , DONG Wu

    … <p>The Bohai Bay is a semi-closed bay located in the western part of the Bohai Sea in China. … In this study, sediment samples were collected near a factory outlet around the Bohai Bay and extracted by alcohol. …

    Annual Meeting of the Japanese Society of Toxicology 47.1(0), P-121, 2020

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  • Construction of genomic marker sets based on the chloroplast genome of a green alga, <i>Ulva pertusa</i> (syn. <i>Ulva australis</i>), leads to simple detection of <i>Ulva</i> species

    Mitsuhashi Chisa , Teramura Hiroshi , Shimada Hiroaki

    … <p>In closed sea areas such as Tokyo Bay, a phenomenon known as a green tide often occurs, in which large amounts of <i>Ulva</i> …

    Genes & Genetic Systems 95(2), 55-63, 2020

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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

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  • The Structure of Small-Scale Fisheries in Noto-Jima Island, Northcentral Japan: A Livelihood Portfolio Approach  [in Japanese]

    Matsui Ayumu

    <p>2013年漁業センサスによれば日本における漁家の兼業率は50.3%であり,約半数の漁家が漁業以外にも何らかの仕事を持っている。本稿では漁家の生業組み合わせに着目し,石川県能登島における漁家漁業の存立構造を明らかにした。事例地域を囲む七尾湾は閉鎖度の高い内湾であるため,通年で波の低い穏やかな海域で沿岸漁業を営みやすい。そのため,漁業者は世帯の戦略に合わせて多様な漁業種類を組み合わせ …

    Japanese Journal of Human Geography 71(2), 127-150, 2019

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  • 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

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  • 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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  • EFFECT OF TIDAL FLAT RESTORATION AT COASTAL FALLOW FIELDS ON HYPOXIA IN AGO BAY  [in Japanese]

    NAGAO Kentaro , KOKUBU Hideki , NAKAMURA Yoshiyuki , ARAI Hiroyuki , NAKANISHI Yasuhiro

    日本の閉鎖性水域の沿岸には,かつては農地・工業用地に利用されていたが現在は遊休地となっている場所が少なくない.本研究では英虞湾を例にとり,数値シミュレーションモデルを用いて,沿岸遊休地の干潟再生による貧酸素水塊の改善効果を算定した.<br> 予測結果から英虞湾において現在遊休地となっているすべての箇所を干潟に再生した場合,枝湾内の貧酸素水塊の面積は約75 %解消されることが明らかとなっ …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_1165-I_1170, 2018

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  • Water Quality Estimate in the Isahaya Bay with UAV  [in Japanese]

    日高 悠広 , 大坪 俊太郎 , 小川 進 , 鈴木 誠二

    … A Watergate in the Isahaya bay was closed because of reclamation construction which started in 1989, and water conversion became a very serious problem. … Multivariable analysis was applied for water quality in the Isahaya bay and picture data, and regression lines of water quality were obtained by calculating six bands. … In this research, mapping water quality in the Isahaya bay was successful for environmental management using UAV. …

    長崎大学大学院工学研究科研究報告 47(88), 1-6, 2017-01

    IR 

  • THE ANALYSIS ABOUT LONG TERM VARIATION IN DENSITY STRATIFICATION OF ARIAKE BAY BASED ON THE MONTHLY-OBSERVED WATER TEMPERATURE AND SALINITY DATA  [in Japanese]

    TAI Akira , MORIMOTO Yosuke

    有明海の水質環境の長期変化について浅海定線調査データを用いた多くの研究が実施されてきたが,研究毎に見解や結論が異なっている場合も多い.本研究では,浅海定線調査データに基づく過去の研究に対して最新のデータを加えた再解析を実施し,諫早湾潮受け堤防締め切り,河川流量や潮汐の長期変化・変動と夏季の密度成層の変化の関連についての考察を行った.主要な結果として,有明海湾奥部の表層塩分は,諫早湾潮受け堤防締め切 …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 73(4), I_1051-I_1056, 2017

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  • Relationship of Subjective Visual Vertical with Static Postural Balance and Gait Asymmetry in Patients with the Lateral Medullary Infarction  [in Japanese]

    ARAI Kazuki , MATSUURA Daisuke , SUGITA Sho , OSU Rieko , KONDO Kunitsugu , OTAKA Yohei

    <p>【目的】延髄外側梗塞患者において自覚的視性垂直位(以下,SVV)と静止立位バランス,歩行非対称性の関係を検討する。【方法】Body lateropulsion(BL)を呈する延髄外側梗塞患者9 名において,SVV 値と立位重心動揺計の総軌跡長,矩形面積,足圧中心左右偏位および加速度計より算出した歩行非対称性との関係をSpearman の相関係数を用いて検討した。【結果】SVV 値 …

    Physical Therapy Japan 44(5), 364-371, 2017

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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 

  • Reexamination of the chronological position of Zenkoji debris avalanche of Usu volcano in south Hokkaido, Japan : In relation to paleoenvironmental changes during the past 20ka on the Usu coast  [in Japanese]

    Fujine Hisashi , Yokota Akihiro , Chiba Tatsuro , Kosugi Yasushi , Endo Kunihiko , Suzuki Masaaki , Yoshimoto Mitsuhiro , Suzuki Shigeru , Nakamura Kentaro , Ito Shigeru , Yamagata Hideki , Lomtatidze Zaur

    <p>有珠火山の南麓には善光寺岩屑なだれ堆積物(Zd)が多数の流れ山をなして分布する.Zdは従来,9kaから6kaに発生した有珠山外輪山の崩壊によるとされてきた.海岸の近くの岩屑なだれの流れ山に囲まれた標高約4.5mの低地においてボーリングコアを2本採取し,その層序,年代,堆積環境,植生変遷を検討した.両コアはほぼ岩相が同様で,標高+2~-6mにわたり連続的に泥炭層および有機質シルト・ …

    The Quaternary Research (Daiyonki-Kenkyu) 55(6), 253-270, 2016

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  • NETWORK CONECTIVITY OF MARINE ECOSYSTEM FOR LARVAL MARBLED SOLE IN OSAKA BAY WITH OCEAN MODELING  [in Japanese]

    SUGIMATSU Koichi , OHMURA Yoshihiro , OMI Hiroaki , TSUJIMURA Hirotaka , HORI Masakazu , NAKAYAMA Akiyoshi

    大阪湾において有用な水産生物であるマコガレイを対象とした生態系ネットワークの解明のため,その発生起源となる産卵場から浮遊期仔魚を経て着底に至るまでの移動分散過程を推定することを試みた.現地調査から2014年のマコガレイ浮遊期仔魚は,1月中旬から下旬にかけて大阪湾内に広く分布していることがわかった.観測された浮遊期仔魚の起源推定のため,海洋数値モデルと,時間軸を順方向,または逆方向にる双方向粒子追跡 …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72(2), I_1375-I_1380, 2016

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  • REDUCTION OF THE TOTAL DEGREES OF FREEDOM IN FRAME ANALYSIS BY THE FIBERED PLASTIC HINGE MODEL  [in Japanese]

    SHUGYO Minoru , SHIMAZU Masaru

    … are made to form the elastoplastic tangent stiffness matrix of the pure steel element: (1)members have thin walled closed or open sections, and cross sections remain plane and do not distort in the absence of cross-sectional warping, (2)deflection is large but elastic strain is small, (3)axial stress and the shear stress due to St. Venant torsion participate in yielding of fibers of members with closed sections, while only axial stress participates for members with open sections, (4)plastic deformation consists of only …

    Journal of Structural and Construction Engineering (Transactions of AIJ) 81(726), 1263-1270, 2016

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  • 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 

  • EFFECT OF HYPOXIC WATER AND WATER TEMPERATURE ON FISH IN TOKYO BAY, JAPAN  [in Japanese]

    HORIE Takehito , OKADA Tomonari , TANAKA Hitoshi

    東京湾を始めとする閉鎖性水域で発生が見られる赤潮や貧酸素水塊は,水産生物の生息環境に多大な影響を及ぼすと言われているが,湾内における水環境の変化と魚類の生息数との関連性については,ほとんど知見が得られていない.そこで本研究では,釣果データを用いて東京湾における水温の長期的変動(年変動)および流況の短期的変動(時間変動)が,湾内における魚類の生息数へ与える影響について把握することを目的とした.主要な …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 71(2), I_1369-I_1374, 2015

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  • SUTUDY ON BEHAVIOR RUDITAPES PHILIPPINARUM IN HYPOXIC AND ANOKIC WATER  [in Japanese]

    KOZUKI Yasunori , YAMANAKA Ryoichi , TSUYAMA Takuro , KAMOGARI Ryo , YAMASHITA Yuya , MATUSHIGE Maya

    貝殻にセンサーを装着し,無酸素環境下でのアサリの行動を連続的に観測した結果,(1)貝殻の開閉距離波形からアサリの行動を4種類に区分することができた.アサリを24時間,無酸素環境中に置くと,異常行動を示すようになり,酸素が十分にある海水中にアサリを戻しても,正常な行動へと戻ることはなかった.無酸素化の影響は,短期間では回復せず,累積することがわかった.ろ水速度は一旦低下するものの,酸素のある環境下に …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 71(2), I_1363-I_1368, 2015

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