Search Results 1-20 of 41

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  • Observation of Sediment Dynamics in the Nearshore Region using Fluorescent Sand Tracers:(Effects of with and without outer bar shape on cross-shore sediment transport)  [in Japanese]

    SUZUKI Takayuki

    … <p>The field observations of cross-shore sediment transport from the swash zone to the offshore side of the outer bar using fluorescent sand tracers were conducted in 2014 and 2015 at the Hasaki coast, Japan facing the Pacific Ocean during storm wave conditions. … The sediment at the offshore side of the outer bar tends to move to onshore ward due to bedload sediment transport. … However, the transport rate decrease in the trough region. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 33(1), 20-27, 2019

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  • BEDROCK EROSION FORMULA BASED ON THE WORK RATE OF BEDLOAD  [in Japanese]

    井上 卓也 , 江頭 進治

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE 63, I_895-900, 2018

  • EXPERIMENTAL STUDY ON BEDLOAD TRANSPORT UNDER BIMODAL SEDIMENT CONDITION  [in Japanese]

    原田 守啓 , 大橋 一弘 , 井上 公斗 , 三輪 浩

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE 62, Ⅰ_1063-1068, 2018

  • BEDLOAD TRANSPORT RATE MEASUREMENT WITH IMPACT PLATE AT KOSHIBU SEDIMENT BYPASS TUNNEL  [in Japanese]

    小柴 孝太 , 角 哲也

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE 62, Ⅰ_841-846, 2018

  • BEDLOAD TRANSPORT RATE MEASUREMENT WITH IMPACT PLATE AT KOSHIBU SEDIMENT BYPASS TUNNEL  [in Japanese]

    KOSHIBA Takahiro , SUMI Tetsuya

    排砂バイパストンネル(SBT)は,日本とスイスがリードする貯水池堆砂対策手法である。しかし,SBTは水と共に高速で流下する土砂によるトンネル底面の摩耗問題を抱えており,維持管理設計基準の確立のためには,SBT内を流下する土砂量の計測が求められる.そこで,既存の掃流砂観測技術をSBTの高速流に耐えうるように平板型に改善したインパクトプレートと呼ばれる計測技術を提案している.本研究では,インパクトプレ …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(4), I_841-I_846, 2018

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  • THE PROCESS OF EROSION AND DEFORMATION OF THE CLAY BED  [in Japanese]

    SEKINE Masato , IKEDA Noriaki , ASHIZAWA Honami , SATO Yu

    本研究の目的は,輸送された掃流砂が粘土河床に与える影響と,その結果生じる粘土河床の横断方向と鉛直方向の構造の変化を解明することにある.浸食速度と粘土河床上の掃流砂の被覆率との関係から,掃流砂による浸食促進効果と浸食抑制効果が明らかになった.また,砂が粘土河床を被覆することで形成される砂と粘土の混合層は,特異な発達過程を有することが明らかとなった.はじめ,掃流砂は横断面に対して一様に輸送される.しか …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(4), I_1087-I_1092, 2018

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  • EXPERIMENTAL STUDY ON BEDLOAD TRANSPORT UNDER BIMODAL SEDIMENT CONDITION  [in Japanese]

    HARADA Morihiro , OHASHI Kazuhiro , INOUE Kimito , MIWA Hiroshi

    本研究は,二峰性粒度分布の条件下で移動しない大径粒子が小径粒子の運動に与える影響を巨視的に把握することを目的とした水理実験を行った.砂粒子径の34倍の径を持つ球状粗度および円柱粗度を設置した水路における砂粒子の移動軌跡を画像解析により把握し,砂粒子の平均ステップレングスの計測とピックアップレートの推定を行った.掃流力に対するステップレングスとピックアップレートの応答は一様ではなく,平均ステップレン …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(4), I_1063-I_1068, 2018

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  • Current and Future Study Topics on Reservoir Sediment Management by Bypass Tunnels

    Kobayashi Sohei , Koshiba Takahiro , Sumi Tetsuya

    … An abrasion model has been developed to predict the abrasion rate of tunnels from the volume of sediment transport. … Further, methods to monitor sediment transport in tunnels have advanced. … A precise rainfall and runoff model for predicting the inflow hydrograph and sediment is essential for the efficient operation of dam gates and SBT (e.g., diverting minimum amount of water for sediment transport). …

    Journal of Disaster Research 13(4), 668-676, 2018

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  • A STUDY ON SAND-MUD MIXTURE TRANSPORT DUE TO WAVES AND TIDAL CURRENTS  [in Japanese]

    NAKAGAWA Yasuyuki , KOSAKO Taichi , YOKOYAMA Naoya , TAKAYAMA Masaru , KOUFUKU Tatsumi

    潮汐流および波浪作用下における砂泥混合底質の移動特性の把握を目的として,熊本港周辺干潟を対象とした現地観測,現地底質を用いた底質移動実験,さらに砂泥混合率の違いによる底質移動過程の変化を考慮した底質輸送モデルの妥当性評価を行った.現地観測により,高波浪時の底質の巻き上げに際して,底質粒度組成の違いに依存する懸濁粒子の粒度組成変動の差異が確認された.一方,底質移動実験により波と流れによる底質輸送量に …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 73(2), I_547-I_552, 2017

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  • Numerical Model for Bank Erosion in the Brahmaputra River

    Biswas Robin K. , Yorozuya Atsuhiro , Egashira Shinji

    … <p>A method is proposed to predict bank erosion and sand bar migration in river reaches where suspended sediment transport is dominant. … The method focuses on the influence of the lateral bed slope on the erosion and deposition rate of suspended sediment, as well as on the profile of lateral bedload transport, assuming that geometric similarity holds in the bank region. …

    Journal of Disaster Research 11(6), 1073-1081, 2016

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  • STUDY ON BEDLOAD MEASUREMENT BY PLATE-TYPE VIBRATION SENSOR  [in Japanese]

    KOSHIBA Takahiro , SUMI Tetsuya , TSUTSUMI Daizo

    …  Measuring the bedload transport rate is utmost interest to understand and quantify all sediment transport related phenomena. … Three existing bedload measuring systems are 1) the hydrophone, 2) the geophone, and 3) the plate microphone as their modified system. … All systems estimate transport rate based on sediment impact, whereas each has respective disadvantages. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 72(4), I_925-I_930, 2016

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  • Simulations of Lateral Erosion in Bedrock Channels  [in Japanese]

    Mishra Jagriti , Inoue Takuya , Shimizu Yasuyuki

    … In this study, laboratory scale experiments were conducted to understand the relationship between sediment feed rate and lateral erosion. … The numerical model assumes that lateral erosion depends on an abrasion coefficient and transverse bedload transport rate per unit width. …

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 72(2), I_527-I_536, 2016

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  • BEDROCK EROSION BY SALTATING BEDLOAD WITH WETTING AND DRYING WEATHERING PROCESS  [in Japanese]

    INOUE Takuya , YAMAGUCHI Satomi , FUNAKI Jungo

    … Bedrock erosion rate E due to collision of saltating bedload is expressed by E=βq<sub>b</sub> … is the bedload transport rate, P<sub>c</sub> … However, the possible impacts that weathering of bedrock has on the erosion rate have not been elucidated. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 71(4), I_853-I_858, 2015

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  • AN EXPERIMENTAL STUDY FOR MORPHOLOGY OF CYCLIC STEPS ON MODEL BEDROCKS  [in Japanese]

    YOKOKAWA Miwa , KYOGOKU Akitoshi , IZUMI Norihiro

    … They are thought to be cyclic steps formed due to erosion of bedrock, which should be driven by abrasion due to bedload sediment transport. … We demonstrated a series of flume experiments of the formation of cyclic steps on bedrock by abrasion due to bedload transportation using weak mortar as the model bedrock. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 71(4), I_997-I_1002, 2015

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  • Experimental and theoretical tools for estimating bedload transport using a Japanese pipe hydrophone

    GOTO Ken , ITOH Takahiro , NAGAYAMA Takahiko , KASAI Mio , MARUTANI Tomomi

    … A Japanese pipe hydrophone is an acoustic sensor that is widely used in Japan to measure bedload transport. … Here we report experimental and theoretical tools for calculating bedload transport using a Japanese pipe hydrophone, and discuss the limitations based on laboratory tests. …

    International Journal of Erosion Control Engineering 7(4), 101-110, 2014

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  • Applicability of bedload observation method using sound pressure data obtained by a hydrophone  [in Japanese]

    SUZUKI Takuro , UCHIDA Taro , OKAMOTO Atsushi , TAKAHASHI Kenta , YAMASHITA Shintaro , KOSUGE Yasukazu , FUKUMOTO Akihisa

    … Hydrophones have been used to measure bedload transport intensity by counting the number of pulses generated when bedload sediments such as sand or gravel strike a steel pipe. … when sediment rate is high, contact with the pipe is continuous, and therefore, readings rarely drop below a count of one or zero. … Flume experiments show that bedload sediment discharge can be calculated quantitatively when using this method. …

    Journal of the Japan Society of Erosion Control Engineering 66(1), 4-14, 2013-05-15

    J-STAGE  References (11)

  • THE BEDLOAD TRANSPORT RATE AND HYDRAULIC RESISTANCE IN BEDROCK CHANNELS PARTLY COVERED WITH GRAVEL  [in Japanese]

    田中 岳 , 泉 典洋

    水工学論文集 土木学会水工学委員会 編 57, 1_1033-1038, 2013

  • THE BEDLOAD TRANSPORT RATE AND HYDRAULIC RESISTANCE IN BEDROCK CHANNELS PARTLY COVERED WITH GRAVEL  [in Japanese]

    TANAKA Gaku , IZUMI Norihiro

    … In this study, hydraulic experiments were performed to determine sediment transport characteristics on bedrock channels partly covered with gravels. … The bedload transport rate and the friction coefficient can be related with the coverage rate of gravels on the channel bed. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 69(4), I_1033-I_1038, 2013

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  • EFFECT OF BEDLOAD TRANSPORT ON EROSION RATE OF COHESIVE SEDIMENT

    HARSANTO Puji , TOAN Nguyen Manh Minh , TAKEBAYASHI Hiroshi , FUJITA Masaharu

    … The purpose of this paper is to study the effect of bedload transport on the erosion rate characteristics of cohesive sediment. … The sediment feeding of the bedload transport rate is varied from 0 to 150% of the equilibrium sediment transport rate. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 68(4), I_19-I_24, 2012

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  • AN EXPERIMENT AND NUMERICAL SIMULATION OF SLURRY-EROSION CAUSED BY BEDLOAD ON BEDROCK  [in Japanese]

    OIKAWA Shin , IWASAKI Toshiki , YAMAGUCHI Satomi , SHIMIZU Yasuyuki , KIMURA Ichiro

    … The bed degradation is going rapidly in the upper part of the Ishikari River recently, owing to exposed bedrock erosion caused by bedload on the bedrock. … In order to estimate the erosion rate of bedrock, we performed an experiment by a circular channel flume with artificial bedrock made of plaster. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 67(4), I_751-I_756, 2011

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