Abstract
Debris flow can be trapped in a steel-grid sabo dam, due to the blockade of coarse woody debris without large stones. In addition, the permeable width of the barricade is not determined by the grain-size accumulation rate, but rather by the grain-size frequency. Information on the grain-size distribution characteristics in mountain streams is needed before construction of the dam. In this study, to identify the ideal structure for controlling sediment runoff, we experimented with the structure of the dam to show how the capture rate is affected under different conditions. The capture effect was evaluated for several grain-size distributions of real mountain stream beds to determine the relationship between grain size and the capture rate.
