Abstract
The purpose of the present paper is to estimate the debris flow control using check dams after removing debris from the check storages based on the results of the numerical analysis of a model torrent and an actual one. A one-dimensional numerical simulation is conducted in order to investigate variations in debris flow characteristics along a river reach with check dams. According to the analytical results, check dams are effective for reducing sediment transport when the initial bed slope of the deposition area at the upstream region of the dam is milder than that of equilibrium slope of debris flow, even if the area is filled with sediment. Removing debris from the check storage is much more effective for controlling debris flow, but the priorities for removing works for a number of check dams must be carefully determined when considering the sediment runoff process and characteristics throughout the torrent.
