レーダ雨量を用いた流出シミュレーションと桜島における土石流発生渓流への適用 [in Japanese] Application of X-band Radar and Runoff Model to Debris Flow Frequently Occurred Creeks in Sakurajima Island [in Japanese]
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To examine effects of spatial distributions of rainfall on local occurrence of debris flow and flash flood, we observed stream discharge by interval cameras and conducted hydrological simulations with X-band rainfall radar data in four catchments in Sakurajima Island. Hydrological processes were simulated for two rainfall data; rainfall data in downstream areas (Case 1) and upstream areas (Case 2) of each catchment was applied for whole area of the catchments. Debris flows generally occurred when very strong rainfall intensity was observed in upstream areas of the study catchments. Simulated stream discharges of Case 2 were more consistent with occurrence of debris flows than those of Case 1. The simulation results also suggested that concentrations of overland flow into gullies were essential for occurrences of debris flow.
京都大学防災研究所年報 (56), 457-464, 2012