Abstract
Recent years, slit Sabo dams have been selected for their function to prevent debris flow disaster and conserve continuity of water and sediment flow simultaneously. In order to clarify the effect of a slit Sabo dam on sediment transportation, the authors have researched the characteristics of rainfall-runoff and sedimentation around a slit Sabo dam in a channel in the Tenjin river basin since 2010. The authors had reported that a slit Sabo dam with steel frame had trapped driftwoods which would prevent the sediment runoff to the downstream channel. This paper reports the results of the field observation from 2012 to 2014 and quasi-2D numerical simulation which enables to consider the influence of the driftwoods on the sediment transportation.
