ANALYSIS OF RIVERBANK EROSION PROCESSES IN ALLUVIAL FANS: APPLICATION TO THE FILED EXPERIMENT IN THE JOGANJI RIVER

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  • 扇状地河川の河岸侵食プロセスの解析法と常願寺川現地実験への適用

Abstract

<p> The erosion process of natural riverbank consists of three parts: bank toe erosion, bank failure and removal of the deposited material on the bank toe. Erosion of the riverbank occurs intermittently during flood events by repeating this process. However, it has not been considered enough in the flood flow and bed variation analysis in rivers. This paper proposes an analysis method of the bank erosion process in alluvial fans by considering the effects of the negative pore water pressure (the matrix suction), three-dimensional flows, and non-equilibrium sediment transports at near-bank area. Moreover, it is shown that the analysis method can explain the bank erosion process of the field experiment in the Joganji River.</p>

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