Search Results 1-20 of 148

  • Development an Integrated Sediment Disaster Simulator and Application to Sediment Disaster Mitigation and Reservoir Sedimentation Management in the Brantas River Basin, Indonesia

    SISINGGIH Dian , FUJITA Masaharu , YAMANOI Kazuki

    … We assessed the sediment transport processes in the upstream of Brantas river basin, analyze its potential sediment disaster, and then formulate adaptation strategies to reduce the loss of reservoir capacity. … The application of the integrated sediment disaster model to this mountainous watershed has been successfully providing detailed information on sediment transport processes in Wlingi sub-basin. …

    京都大学防災研究所年報. B = Disaster Prevention Research Institute Annuals. B 62(B), 626-631, 2019-09

    IR 

  • Piecewise Feedforward Path Planning of an Overhead Crane for Obstacle Avoidance and Sway Control by Vibration Manipulation Function:(Rotational Transport around an Obstacle)  [in Japanese]

    KOTAKE Shigeo , NISHIDA Daiki , OKAMURA Daichi

    … In this study, square-like or regular-octagon-like round path was planned to suppress vibration of the suspended load and to avoid collision to the obstacle. … However, when the velocity change of the trolley was larger, we couldn't suppress the vibration of the load, because of the nonlinearity of the pendulum. … When the crane was moved under the piecewise sampled-data control, the trajectory of load became more robust. …

    The Proceedings of the Dynamics & Design Conference 2019(0), 128, 2019

    J-STAGE 

  • The Use of Sediment Rating Curve under its Limitations to Estimate the Suspended Load

    Hapsari Diana , Onishi Takeo , Imaizumi Fumitoshi , Noda Keigo , Senge Masateru

    … <p>The suspended sediment load in river water is an important index for the soil erosion rate in the watersheds of designated rivers. … Amongst the various methods for estimating the suspended sediment load, the most frequently used one is the sediment rating curve. …

    Reviews in Agricultural Science 7(0), 88-101, 2019

    J-STAGE 

  • Development of Robotic Human Support Unit for workload reduction on the lower surface of bridge and Social Implementation Experiment  [in Japanese]

    ISHIKAWA Hitoshi , OMURA Riku , MIURA Rintaro , TANAKA Kenta , TANAKA Tetta , AOKI Yusuke

    … <p>In Japan it enforced Basic Act for National Resilience Contributing from Ministry of Land, Infrastructure, Transport and Tourism (MLIT) based on the lessons learned from The Great East Japan Earthquake. … Suspended scaffolds are used to inspect and repair large bridges. … However, work in suspended scaffold places a burden on worker. … So, there is a demand for a system that reduces the load. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2019(0), 2P2-B12, 2019

    J-STAGE 

  • Estimation of Generation and Contamination of Tsunami Deposit from Sea Sediment by using Tsunami Simulator with Suspended Load Transport Model  [in Japanese]

    Nakamura Kosuke , Endo Kazuto

    <p>津波解析モデルと浮遊砂移動モデルを用い、津波災害が予想される都市を対象に、津波堆積物の発生および汚染状況を予測した。都市化率等を反映したManningの粗度係数を用いる場合より、底質の粒径から求めたManningの粗度係数を用いる場合の方が、津波堆積物の発生量は小さくなった。津波堆積物の粒径分布は、小さい側の粒径が卓越すると予想された。このことから、津波堆積物の汚染は粒径の小さな …

    Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management 30(0), 123, 2019

    J-STAGE 

  • Study on setting of saturation concentration of suspended sediment in numerical simulation of sediment transport associated with tsunami for off Takahama Bay  [in Japanese]

    MURAKAMI Yoshikane , SHIKATA Takemi , TONOMO Koji , SUGAWARA Daisuke , HIRAISHI Tetsuya

    掃流砂層と浮遊砂層の交換砂量を考慮した津波移動床モデルのうち,高橋ほか(1999)の手法においては,飽和浮遊砂濃度が計算結果に与える影響が大きく,その設定方法の高度化が課題となっている。本研究では,関西電力高浜発電所の基準津波を用いて,既往の研究事例よりも広域の計算領域を対象に,藤井ほか(1998)および高橋ほか(1999)の手法により,飽和浮遊砂濃度を時空間的に一定の定数として与えた場合の地形変 …

    Journal of Japan Society for Natural Disaster Science 37(2), 165-176, 2019

    J-STAGE 

  • NUMERICAL SIMULATION FOR SEDIMENT TRANSPORT IN SURF ZONE BY 3D DEM-MPS COUPLING  [in Japanese]

    原田 英治 , 五十里 洋行 , 後藤 仁志 , 居村 光孝 , 清水 裕真

    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_751-756, 2018

  • IMPORTANCE OF EVALUATING BOTH SURFACE ROUGHNESS AND POROSITY IN THE PHENOMENON OF PASSING FINE SAND THROUGH THE BED CONSISTING OF GRAVELS  [in Japanese]

    MIZOGUCHI Atsuko

    <p> 粒度分布に二峰性の特徴がある河床上の移動床問題に関する研究は,以前から多数の研究者により行われてきた.しかし,個別要素法などで粒子レベルの計算など様々な解析が可能となった現在も,ダム下流の河道の解析となると,河床材料,状態のとらえ方の問題から,簡素化してとらえたとしても粗粒化河床への砂の供給現象が解けていない現状がある.本研究では,一様粒径であれば浮遊状態で流下する条件で砂を礫 …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(5), I_1147-I_1152, 2018

    J-STAGE 

  • THE EFFECT OF SEDIMENT TRANSPORT DUE TO THE KUMAMOTO EARTHQUAKES ON AN INTERTIDAL FLAT AT THE MOUTH OF THE SHIRAKAWA RIVER  [in Japanese]

    TAI Akira , AKAMATSU Yoshihisa , YAMAMOTO Koichi , KOMORITA Tomohiro , HATTORI Keitaro , INUI Ryutei , NIHEI Yasuo

    2016年4月の熊本地震により,白川流域では阿蘇地方を中心に土砂崩れが多発し,これらの土砂崩れにより多量の土砂・流木が河道に流入し,出水によって河道や白川河口干潟へと堆積した.そこで,熊本地震に起因する白川河口干潟への土砂堆積の影響を調査するために,(1)白川河道内の浮遊懸濁物質の通過量の算定,(2)白川河口干潟の地盤高の変化の測量,(3)アサリへの影響調査を実施した.その結果,熊本地震発生後は通 …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(4), I_481-I_486, 2018

    J-STAGE 

  • VERTICAL SORTING MECHANISM ON RIVERBED COMPOSED OF BOULDERS AS FRAMEWORK  [in Japanese]

    SEKINE Masato , HIRAMATSU Yuki , NAKAGAWA Yuki

    本研究では,洪水時でも移動しない大礫が骨格を構成する河床の流砂現象に着目した.著者らは,河床材料を大礫(L粒子),掃流砂として移動する砂礫(M粒子),浮遊砂として移動する砂(S粒子)の三つの粒径集団に分けて,これらを一つの粒径で代表させてきた.しかし,現地の河床材料は連続する粒度分布をもつため,掃流砂礫に粒度幅をもたせることが河床の鉛直構造に与える影響について調べた.その結果,いずれの場合でもL粒 …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(4), I_1069-I_1074, 2018

    J-STAGE 

  • NUMERICAL SIMULATION FOR SEDIMENT TRANSPORT IN SURF ZONE BY 3D DEM-MPS COUPLING  [in Japanese]

    HARADA Eiji , IKARI Hiroyuki , GOTOH Hitoshi , IMURA Mitsutaka , SHIMIZU Yuma

    土砂輸送が顕在化する砕波帯漂砂の数値シミュレーションでは,複雑な自由水面および底質の移動床境界の扱いが重要となる.本研究では,高精度MPS法による流体解析から自由水面をシャープに捉えつつ,底質移動床界面は粒子間相互作用力の評価が可能なDEMによる掃流粒子群挙動の追跡から与える.また,浮遊過程はパッシブスカラーとして与えた濃度の移流拡散から評価する.このようなDEM-MPS法の固液混相流モデルを用い …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_751-I_756, 2018

    J-STAGE 

  • NUMERICAL SIMULATION FOR UNDERSTANDING OF THE OFFSHORE- DIRECTED SEDIMENT TRANSPORT BY 2011 TOHOKU-OKI TSUNAMI AT SOUTHERN PART OF THE SENDAI BAY  [in Japanese]

    YOSHIKAWA Shuro , SUGAWARA Daisuke , GOTO Kazuhisa , SATO Akira , KANAMATSU Toshiya , SAKAGUCHI Hide

    2011年東北地方太平洋沖地震津波による土砂移動現象の全容解明や,今後の津波による沿岸域土砂災害予測において,土砂移動の数値モデルの妥当性検証や予測精度向上が求められる.そのためには,観測結果に基づく現象解釈と計算結果の擦り合せが重要と考え,本論では仙台湾南部を対象に検討した.数値計算結果から,調査域浅海底の津波による土砂移動は引き波時に顕著であり,粒径別の土砂移動範囲も含めて,フィールドデータに …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_337-I_342, 2018

    J-STAGE 

  • Inverse Tsunami Flow Modeling Including Nonequilibrium Sediment Transport, With Application to Deposits From the 2011 Tohoku-Oki Tsunami

    Naruse Hajime , Abe Tomoya

    … However, existing models consider neither nonuniform transport of suspended sediment nor turbulent mixing, which are essential factors governing sedimentation from suspension in tsunami flows. … Here we propose a new inverse model of tsunami deposit emplacement, considering both transport of nonuniform suspended load and entrainment of basal sediments. …

    Journal of Geophysical Research: Earth Surface 122(11), 2159-2182, 2017-11

    IR 

  • BAMBOO SPIKE BALL - A NEW EQUIPMENT FOR SEDIMENT TRANSPORT CONTROL  [in Japanese]

    TOAN Nguyen Manh Minh , TAKEBAYASHI Hiroshi , FUJITA Masaharu

    … In addition to the problems cause by load quantity, sediment can easily introduce pollution and other contaminants into a waterway, spreading the pollutants downstream<sup>1</sup>. … The most problematic contaminants in both bedded and suspended sediment are metals and persistent bioaccumulative toxics (PBTs), such as pesticides and methyl mercury<sup>2</sup>. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 73(4), I_793-I_798, 2017

    J-STAGE 

  • EVALUATION FOR THE TRANSPORT OF CORBICULA JAPONICA AFTER THEIR SETTLEMENT IN LAKE SHINJI  [in Japanese]

    YAJIMA Hiroshi , MOROHARA Ryohei , KAWANO Hiromi

    宍道湖におけるシジミの移動過程を解明するため,シジミを砂粒子と仮定しての移動評価を試みた.まず,造波水路を用いて,シジミを砂粒子と仮定することの妥当性の検証を行った.その結果,殻長による補正を行えば,シジミを砂粒子として扱い妥当な評価を行うことができることを明かにした.次に,流れと波浪に関する現地調査を行い,底面に生じるせん断応力の評価から,シジミは主に波によって底面を掃流移動していることが示唆さ …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 73(4), I_955-I_960, 2017

    J-STAGE 

  • Current condition and future challenges of sediment transport monitoring system in Korea :  [in Japanese]

    SEO Junpyo , JUNG Yugyeong , LEE Kihwan , LEE Changwoo , KIM Dongyeob , UCHIDA Taro , IUCHI Takuma

    … <p>Since 2013, National Institute of Forest Science started the sediment transport monitoring in mountain rivers to clarify effects of forest damages due to forest fire and landslide on the sediment discharge from mountainous catchment. … We used hydrophone (Japanese pipe hydrophone) for bedload monitoring and turbidity meter for suspended load monitoring. …

    Journal of the Japan Society of Erosion Control Engineering 69(5), 71-74, 2017

    J-STAGE 

  • Year-round variations in the fluvial transport load of particulate 137Cs in a forested catchment affected by the Fukushima Daiichi Nuclear Power Plant accident

    松永 武 , 中西 貴宏 , 安藤 麻里子 , 竹内 絵里奈 , 武藤 琴美 , 都築 克紀 , 西村 周作 , 小嵐 淳 , 乙坂 重嘉 , 佐藤 努 , 宮田 佳樹 , 長尾 誠也

    著者所属: 日本原子力研究開発機構(JAEA)

    Journal of Radioanalytical and Nuclear Chemistry 310(2), 679-693, 2016-11

    IR 

  • Challenges facing suspended sediment observation in mountain rivers  [in Japanese]

    TAMURA Keiji , KOSUGE Yasukazu , UCHIDA Taro , NAGATA Yoko , KOSUGI Ken'ichirou , MIZUYAMA Takahisa

    … <p>Suspended sediment in mountain rivers can be observed using two methods : one measures the suspended sediment concentration directly by sampling the water ; … 1) The turbidity meter can only measure the wash load (particle size<0.106 mm). …

    Journal of the Japan Society of Erosion Control Engineering 69(4), 3-9, 2016

    J-STAGE 

  • EXPERIMENTAL STUDY ON FLOW FIELD AROUND BANDAL-LIKE STRUCTURES UNDER SUSPENDED LOAD TRANSPORT CONDITION  [in Japanese]

    NISHIO Kei , NAKAGAWA Hajime , KAWAIKE Kenji , ZHANG Hao

    …  This paper is intended to investigate the characteristics of suspended sediment transport and flow field surrounding Bandal-like structures. … Bandal-like structure works well under suspended sediment conditions. … In this study, attempts have been made to seek scientific evidences for Bandal-like structures with a laboratory experimental study on the local flow, suspended load concentration and bed deposition around Bandal-like structures. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 72(4), I_841-I_846, 2016

    J-STAGE 

  • NUMERICAL SIMULATION ON TURBIDITY FLOW INTO WATER USING PARTICLE-BASED TURBIDITY TRANSPORT MODEL  [in Japanese]

    IKARI Hiroyuki , GOTOH Hitoshi , MATSUSHIMA Ryotaro

    津波越流発生時の防波堤の安定性をより正確に評価するためには,越流水による洗掘に伴う地盤変形も考慮に入れた検討が必須である.粒子法は,複雑な水面変形および地盤の大変形の解析に適した手法であるので,このような場への適用が期待されるが,実際の砂粒径よりも粗いサイズの計算粒径を用いて洗掘の進行速度の妥当性を維持するためには,計算粒径以下の砂粒(濁質)の挙動を考慮するサブモデルの導入が有効である.本モデルで …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72(2), I_61-I_66, 2016

    J-STAGE 

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