Search Results 1-20 of 260

  • Inundation analysis using coupling storage function model with a distributed hydrological model in Kushiro marsh, Japan

    Sakaguchi Shino , Nakayama Keisuke , Kobayashi Kenichiro , Komai Katsuaki

    … <p>In Kushiro River basin, inundation is likely to occur due to heavy rain, since the river-bed slope is very gentle in the downstream portion, which has natural levees. … Consequently, in past floods, river discharge was observed to increase slowly and a delay of a few days in peak river discharge was observed compared to the peak precipitation. …

    Hydrological Research Letters 14(2), 75-80, 2020

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  • THE EFFECT OF CHANNEL WIDTH AND CHANNEL BED SLOPE ON LEVEE BREACH PROCESSES

    SHIMADA Tomonori , WATANABE Yasuharu , OKABE Hirokazu , IWASAKI Toshiki , NAKASHIMA Yasuhiro

    … However, those experiments were performed under limited river channel conditions. … Using the numerical-computation model developed on the basis of the experiments performed so far, the effects of river width and riverbed slope on the levee breach phenomenon have been studied. …

    Journal of JSCE 8(1), 71-78, 2020

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  • Influence of mega debris flow on geomorphological features of the upper reaches in the Abe River examined from the formation process of the Akamizu waterfall  [in Japanese]

    Shirai Masaaki , Utsugawa Takako , Watanabe Mayo

    <p>静岡県安倍川上流域では,1707年の宝永地震の際,大谷崩の大規模崩壊により発生した土石流堆積物が谷を埋めたとされる.土石流堆積物の分布と礫の配列から,大規模崩壊前の安倍川の谷は山地内を穿入蛇行しており,その谷が土石流堆積物に埋積された結果,安倍川の水流が一時的に谷底との高度差を失った頁岩の尾根を越えてショートカットし,赤水の滝の原型が形成されたことを明らかにした.赤水の滝以外にも …

    The Quaternary Research (Daiyonki-Kenkyu) 59(1), 17-29, 2020

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  • Landform development of the Iwanai Plain, Western Hokkaido, Japan:―with particular reference to "active faults" in the site of Tomari Nuclear Power Station―  [in Japanese]

    Ono Yugo , Saito Kaizaburo

    … Base gravel beds, located at about -30m and -65m correspond to the river bed gravel deposited on the lower sea-levels, MIS6 and MIS8. … Trace of dislocation by F-1 fault disappears gradually in the upper sediments which are covered by the slope deposits including the pumice grains of Spfa1 (42ka), Toya and one from Niseko volcano (around 220ka). …

    Active Fault Research 2019(51), 27-52, 2019

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  • A STUDY ON THE RISK ASSESSMENT METHOD OF THE SMALL SEDIMENT INFLOW INTO THE RAILWAY TRACK  [in Japanese]

    MORI Taiki , FUJII Masataka , SUGIYAMA Tomoyasu , SATOFUKA Yoshifumi

    <p> 鉄道の降雨災害のひとつに,渓流からの土砂流入災害がある.過去には,わずかな流入土砂等に列車が乗り上げて脱線する事故も発生している.線路沿線には膨大な数の渓流が存在し,それらの流域は鉄道管理用地外におよぶこと,また渓流には地形,渓床や渓岸斜面の荒廃状態等の様々な要因が混在することから,危険度評価には多くの時間を要するうえに,調査者の危険度判断能力によるバラツキが生じる可能性がある …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 75(1), 31-48, 2019

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  • <b>Water Environment Characteristics and Forming Factors of Islands in Nagasaki Prefecture(3)</b>  [in Japanese]

    YAMAKI Go , KODERA Koji , ASAMI Kazuki , IGARI Yoshihiro , HORIUCHI Masaki

    <b>Ⅰ はじめに</b><br><br> 長崎県の島嶼に関する水文学的調査・研究はほとんどないことから、2014年より五島列島、対馬、壱岐、平戸と研究を進めており、これまで、数年間の調査により明らかになった季節変化や海塩の影響をはじめとした各島の特徴を発表してきた。今回は、流域解析及び数年間の調査結果の統計解析を行った結果をもとに、形成要因について …

    Proceedings of the General Meeting of the Association of Japanese Geographers 2019s(0), 248, 2019

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  • Study on Behavior of Turbid Water around Dredged Navigation Channel at River Mouth  [in Japanese]

    NAKAGAWA Yasuyuki

    … <p>Field measurements were carried out in the port of Niigata to elucidate sediment transport processes around navigation channel and turning basin in the port at river mouth. … The survey successfully captured the formation of three layers structure during a river flood condition with high turbid fresh water in the upper layer and low turbid sea water in the middle layer. …

    JAPANESE JOURNAL OF MULTIPHASE FLOW 33(1), 12-19, 2019

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  • THE INFLUENCE OF BED SLOPE CHANGE ON EROSIONAL MORPHOLOGY

    SUMNER Tamaki , INOUE Takuya , SHIMIZU Yasuyuki

    … The shortcuts have lowered river water surface elevation during flooding, and they have been shown to suppress these flooding events. … On the other hand, the riverbed elevations rapidly decreased as bed slope changed artificially and canyons were formed in several rivers. … Little is known about how riverbed degradation occurs or how the canyon is formed by change in the bed slope. …

    Journal of JSCE 7(1), 15-21, 2019

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  • MONITORING UNSTEADY STREAMFLOW-STAGE HYSTERESIS BEHAVIOR OF A GRAVEL-BED RIVER

    AL SAWAF Mohamad Basel , KAWANISI Kiyosi , DANIAL Mochammad Meddy

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE 62, Ⅰ_313-318, 2018

  • METHOD TO EVALUATE LONGITUDINAL SEDIMENT SORTING FOCUSING ON SEDIMENT TRANSPORT MECHANISM  [in Japanese]

    HARADA Daisuke , EGASHIRA Shinji

    <p> ネパール国ウエストラプティ川では,僅かな区間内で顕著な河床材料の分級が生じている.本研究は流砂機構の違いに着目して,この分級現象を説明しようとするものである.一般に適用されているような流砂量式を用いてウエストラプティ川で見られるような河床材料及び流砂の縦断分級を説明することは難しい.そこで,河床材料の評価方法として掃流砂層厚を,また無次元掃流力の5/2乗に比例する掃流砂量式を導 …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(5), I_907-I_912, 2018

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  • APPEARANCE CHARACTERISTICS OF RIVER BED CONFIGURATION AND CONTROLLING FACTORS OF STEP-POOL STRUCTURE IN A GRANITIC HEADWATER CATCHMENT  [in Japanese]

    ITSUKUSHIMA Rei , SATO Tatsuro

    <p> 本研究は,花崗岩山地河川源頭部に出現する河床形態と河床勾配の関係及び階段状河床形態を構成するstep構造とその支配要因の関係を調べたものである.源頭部では,河床勾配に応じた河床形態の遷移が確認され,勾配が急な上流から下流に向けて,滝,cascade,step及び早瀬と優占する河床形態が変化した.また,階段状河床形態は,河床勾配やstep間隔とstep高の比によってstep-po …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(5), I_1255-I_1260, 2018

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  • A STUDY ON THE EFFECT OF SEDIMENT SUPPLY FROM MOUNTAIN BASIN DURING LARGE SCALE FLOOD ON RIVER BED DEFORMATION  [in Japanese]

    AOKI Kentaro , FUJITA Masaharu , KATO Youhei

    <p> 地球規模で進行している温暖化の影響により,平成27年の関東・東北豪雨,平成28年の北海道・東北地方を襲った一連の台風,平成29年の九州北部豪雨など,全国各地で大規模な水災害が発生している.今後,更なる温暖化の進行により現在よりもさらに激しい降雨も予想され,大規模な水災害が頻発し,甚大な被害が発生する可能性がある.山地部で豪雨が発生した場合,表層崩壊や深層崩壊により多量の土砂が生 …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(5), I_1123-I_1128, 2018

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  • Large sediment discharge caused by periglacial slope failures and erosion induced by Typhoon Lionrock (2016) in Pekerebetsu Creek, Hokkaido, Japan  [in Japanese]

    MIYAZAKI Tomoyoshi , OSANAI Nobutomo , SAWADA Masayo , MATSUOKA Naoki , TACHIKAWA Yoshimichi , TAKASHIMA Shigenori , YOSHIDA Yasunori , HAYASHI Shin-ichiro , FURUICHI Takahisa , KASAI Mio

    … <p>It is important to understand the characteristics of sediment transport in gravel bed rivers for sediment disaster prevention. … This study aims to find relationships between the sediment discharge and its control factors such as sediment supply and deposition, topographic features and bed materials. … Small-scale debris flows were detected in the headwater, which developed into large scale flow due to the erosion of periglacial slope deposits with fine materials (<2 mm) at 35-45%. …

    Journal of the Japan Society of Erosion Control Engineering 71(2), 22-33, 2018

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  • MONITORING UNSTEADY STREAMFLOW-STAGE HYSTERESIS BEHAVIOR OF A GRAVEL-BED RIVER  [in Japanese]

    Mohamad Basel AL SAWAF , KAWANISI Kiyosi , DANIAL Mochammad Meddy

    …  The aim of this contribution is to monitor unsteady behavior of streamflow, as well as, loops of streamflow-stage in a relatively small mountainous river. … In order to determine river discharge, two methods were used: (i) the continuous slope area method (CSA), and (ii) the Index Velocity Rating Curve discharge data obtained by means of a novel fluvial acoustic tomography system (FATS) which developed by Hiroshima University. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(4), I_313-I_318, 2018

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  • Spawning nests of six goby species in a newly-established fish-way on the Onga River estuary barrage  [in Japanese]

    Koyama Akihiko , Matsunaga Seiya , Kawamoto Tomonori , Kanno Kazuki , Sawa Kaito , Onikura Norio

    … <p>A new fish-way, comprising variously-sized bed materials on a gentle slope, established on the Onga River estuary barrage was found to have 69 cobbles and boulders used as spawning nests of six goby species, including a threatened species, during the period from June 2013 to May 2014. …

    Japanese Journal of Ichthyology 65(2), 191-197, 2018

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  • A CALCULATION METHOD FOR FLOWS DOWNSTREAM FROM A NEGATIVE STEP WITH HYDRAULIC JUMP BASED ON A DEPTH-INTEGRATED MODEL  [in Japanese]

    UCHIDA Tatsuhiko

    河川構造物の設計,維持管理において,下流水深によって跳水形態が変化する段落ち部下流の流れを明らかにすることは重要である.本研究では,比較的大きな粗面が段落ち部下流に存在する場合を対象として,実用性の高い水深積分モデルによる解析法を開発する.解析には,非平衡粗面抵抗則を導入した非静水圧水深積分モデルであるGBVC4-DWL法を応用する.段落ち部背後の仮想河床と砕波モデルを導入することで,本解析法は実 …

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 74(1), 17-26, 2018

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  • Geoscience Teaching Using Local Geological Materials(8)Features of composition, shape, and size of river bed gravels of the Ashida-gawa River in Hiroshima prefecture from the aspect of terrain property in the southern part of Chugoku district  [in Japanese]

    山崎 博史 , 梶原 周作 , 吉冨 健一

    本研究の一部は日本学術振興会科研費JP16K00966,JP17H00820の助成を受けて行われた。

    広島大学大学院教育学研究科紀要. 第二部, 文化教育開発関連領域 (67), 1-8, 2018

    IR  DOI 

  • STUDY ON THE UPSTREAM BOUNDARY CONDITION FOR CALCULATING FLOOD FLOWS AND BED VARIATIONS IN A STEEP SLOPE RIVER WITH LARGE AMOUNT OF SEDIMENT TRANSPORT  [in Japanese]

    岡安 光太郎 , 池田 博明 , 内田 龍彦 , 福岡 捷二

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE 61, Ⅰ_637-642, 2017

  • Sediment discharge in the Tokachi region, Hokkaido, caused by Typhoon No. 10 (Lionrock), 2016  [in Japanese]

    OSANAI Nobutomo , ABE Takaaki , NUNOKAWA Masanori , YOSHII Atsushi , MOMIJI atsuya , WATANABE Yasuharu , SHIONO Yasuhiro , MIYAZAKI Tomoyoshi , SAWADA Masayo , HAYAKAWA Tomoya , MATSUOKA Akira , KASAI Mio , SAEKI Tetsuro , INABA Chiaki , NAGATA Naomi , MATSUOKA Naoki , INOUE Ryoko , HAYASHI Shin-ichiro , KATSURA Shin'ya , FURUICHI Takahisa , IGURA Mari , KOSAKA Muneaki , FUJINAMI Takeshi , MIZUGAKI Shigeru

    … <p>Soon after three typhoons (No. 7, 11, and 9) hit Hokkaido in August 2016, Typhoon No. 10, Lionrock brought a large amount of orographic rainfall on the eastern slope of the Hidaka Range from August 29 to 31, which caused substantial discharge of sediment. …

    Journal of the Japan Society of Erosion Control Engineering 69(6), 80-91, 2017

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  • STUDY ON THE UPSTREAM BOUNDARY CONDITION FOR CALCULATING FLOOD FLOWS AND BED VARIATIONS IN A STEEP SLOPE RIVER WITH LARGE AMOUNT OF SEDIMENT TRANSPORT  [in Japanese]

    OKAYASU Kotaro , IKEDA Hiroaki , UCHIDA Tatsuhiko , FUKUOKA Shoji

    本研究では,緩流河川で適用性の高い観測水面形を用いた洪水流と河床変動解析の一体解析法を急流河川である姫川で実行するため,検討の第一段階として,解析における流れと河床変動の上流端境界条件の与え方について検討した.上流からの流入流量については複数地点の観測水位を用いて定める手法を開発し,また実測河床変動量を用いて河床変動解析区間の上流端境界条件を設定する方法を検討した.本解析法を石礫河川の二次元洪水流 …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 73(4), I_637-I_642, 2017

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