Factors Affecting Sedimentary Outflow from Talus Slope by Debris Flow

A Laboratory Experiment

Abstract

To examine running distance of debris flows occurring on the talus slopes, rainfall experiments were carried out. The quantity V_t is defined as the reciprocal of the threshold value of L_c/ L_t, at which debris flows just reach the bottom of the talus slope, where L_c is the horizontal length of the cliff and L_t is the horizontal length of the talus slope. The value of V_t is also a measure of the possibility of sedimentary outflow from the talus slope by debris flow. The value of V_t shows strong correlation with the hydraulic conductivity of talus sediment (K) and the rainfall intensity (I_r). The outflow of debris from the talus slope can be predicted using the values of L_c, L_t, K, and I_r.