STUDY ON TRANSPORT AND DEPOSITION OF MIXED SEDIMENT IN BEDROCK RIVERS

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  • 軟岩河床を流下する混合流砂の移動・堆積に関する考察

Abstract

<p> In Japan, gravel extraction and river channel excavation conducted until the 1970s reduced the amount of sediment in river channel and exposed weak bedrock layers. Although various studies have been conducted to contribute to the management of bedrock rivers, the bedrock erosion rate due to collisions of mixed grain size sediments has not been investigated. Therefore, in this study, we conducted an experiment in which mixed grain size sediments were supplied on an erodible mortar bed that simulated weak bedrock, and observed how the sediments were transported and deposited while eroding the bedrock. Our results suggest that not only the mean grain size of mixed grain size sediments, but also the bedrock roughness and the ratio of large and small particles affect the bedrock erosion rate.</p>

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