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Estimation of Sediment Yield Taking into Account SPA Tial Distribution of Moisture in a Basin

Author(s): Tatsuya Nakazawa; Makoto Nakatsugawa

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Keywords: Sediment yield; Slope failure; Basin storage capacity

Abstract: This research aims to estimate the sediment yield generated by slope failures in a river basin based on hydrological, geographical and geological factors. For comprehensive sediment management throughout a river basin, it is necessary to estimate the sediment yield from mountains as well as to estimate river channel sediment dynamics. To estimate the sediment yield, the authors took into account not only the rainfall intensity during flooding but the basin storage capacity, which is regarded as an index of soil moisture. Therefore, the authors quantified the basin storage capacity by using a hydrologic cycle model that simulates the long-term spatial distribution of rainfall and runoff before and during a flood. This paper proposes equations for estimating the sediment yield in the Nukabira river basin of Hokkaido. Good reproducibility was obtained for the sediment yield and its distribution.


Year: 2012

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