A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
PROBLEM TO BE SOLVED: To provide a highly accurate analysis method for debris flow conditions, taking into consideration the changes in pore fluid density caused by inclination of the riverbed etc.SOLUTION: Concerning debris flow that contains pore water and sediment, in which the sediment comprises a fine grain component that functions in the same way as pore water and a larger grain component of grain sizes larger than the fine grains, the following processes are carried out: the displacement and speed of erosion and sedimentation on a riverbed 1 are calculated for each time step and each two-dimensional topographical mesh; based on the calculation results, a plan view of the sediment displacement conditions and sediment displacement that yields the sedimentation depth are analyzed; and the displacement and speed of erosion and sedimentation on the riverbed 1 are calculated taking into consideration the changes in the ratios of the fine grain component and the larger grain component contained in the sediment, which arise as the fine grain component travels on the riverbed 1.
【課題】河床の勾配等によって間隙流体の密度が変動することを考慮し、土石流の状態を高い精度で行う解析方法を提供する。【解決手段】間隙水と土砂を含み、土砂は、間隙水と同じ機能を有する細粒成分と、細粒成分より粒径が大きい構成粒子成分を含む土石流について、時間ステップ毎及び２次元地形メッシュ毎に、河床１における移動量及び侵食堆積速度を算出し、この算出結果に基づき平面視での土石流の移動状態及び土石堆積深を得る土石流の移動を解析し、細粒成分が河床１の移動する過程で生じる、土砂中の細粒成分と構成粒子成分の割合の変動を採り入れて、河床１の移動量及び侵食堆積速度を算出する。【選択図】図１
PROBLEM TO BE SOLVED: To provide a highly accurate analysis method for debris flow conditions, taking into consideration the changes in pore fluid density caused by inclination of the riverbed etc.SOLUTION: Concerning debris flow that contains pore water and sediment, in which the sediment comprises a fine grain component that functions in the same way as pore water and a larger grain component of grain sizes larger than the fine grains, the following processes are carried out: the displacement and speed of erosion and sedimentation on a riverbed 1 are calculated for each time step and each two-dimensional topographical mesh; based on the calculation results, a plan view of the sediment displacement conditions and sediment displacement that yields the sedimentation depth are analyzed; and the displacement and speed of erosion and sedimentation on the riverbed 1 are calculated taking into consideration the changes in the ratios of the fine grain component and the larger grain component contained in the sediment, which arise as the fine grain component travels on the riverbed 1.
【課題】河床の勾配等によって間隙流体の密度が変動することを考慮し、土石流の状態を高い精度で行う解析方法を提供する。【解決手段】間隙水と土砂を含み、土砂は、間隙水と同じ機能を有する細粒成分と、細粒成分より粒径が大きい構成粒子成分を含む土石流について、時間ステップ毎及び２次元地形メッシュ毎に、河床１における移動量及び侵食堆積速度を算出し、この算出結果に基づき平面視での土石流の移動状態及び土石堆積深を得る土石流の移動を解析し、細粒成分が河床１の移動する過程で生じる、土砂中の細粒成分と構成粒子成分の割合の変動を採り入れて、河床１の移動量及び侵食堆積速度を算出する。【選択図】図１
ANALYSIS METHOD FOR DEBRIS FLOW IN MOTION
土石流の移動の解析方法
SUZUKI TAKUO (author)
2015-06-22
Patent
Electronic Resource
Japanese
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