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Recently, the increase in heavy rainfall has led to an increase in damage due to debris flow, and thus, interest in accurate debris-flow prediction has increased. In this regard, understanding the behavior of debris flow is necessary. Whereas many studies have been carried out to improve the prediction accuracy of debris-flow movements, relatively few studies have focused on debris-flow deposits. Therefore, investigating the possibility of accurate numerical simulation is necessary, and we performed simulation of deposits using Urban Debris Simulator (UDS). Before the simulation of the deposits, the optimum conditions were derived from the sensitivity analysis of the time step and grid size of the United States Geological Survey debris flume. Because the deposit shape of a debris flow is asymmetrical and irregular, reproducing it using the rheological models whose viscosity is in the scalar form is difficult. The deposit experiments performed in USGS debris flume were reproduced in UDS, which had a tensor-type eddy viscosity, and numerical simulations were carried out under varying eddy viscosity values. As a result, the optimal eddy viscosity was obtained, and we confirmed that the accurate deposit shape of the debris flow can be simulated using eddy viscosity.

Numerical Analysis of the Deposit Shape of Debris Flow using Eddy Viscosity