CONSIDERATION OF MOVEMENT OF BOULDERS USING QUASI-THREE-DIMENSIONAL ANALYSIS BASED ON FLOOD WATER SURFACE PLOFILES AND DETAILED RIVERBED OBSERVATION DATA

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  • 山地河川における洪水観測水面形と詳細地形測量結果に基づく非静水圧準三次元解析(Q3D-FEBS)を用いた巨石群の移動解析

Abstract

<p> Mountain rivers are composed of a wide range of particle sizes. In particular, the movement of boulders with a size of about 1.0m has an effect on flow resistance and sediment transport. In this study, we surveyed the existence and loss of boulders and gravels, and investigated the judgement method of boulder movement due to the flood flow in the Takiyama River. Using quasi-three-dimensional flood flow analysis by Q3D-FEBS based on the observed water surface profiles and detailed topographic survey data, we attempted to evaluate the movement of boulders by flood flows. The future issues on this matter are discussed.</p>

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