Large sediment discharge caused by periglacial slope failures and erosion induced by Typhoon Lionrock (2016) in Pekerebetsu Creek, Hokkaido, Japan

Tomoyoshi MIYAZAKI, Masayo SAWADA, Naoki MATSUOKA, Yoshimichi TACHIKAWA, Shigenori TAKASHIMA, Yasunori YOSHIDA, Shin-ichiro HAYASHI, Takahisa FURUICHI, Mio KASAI and Nobutomo OSANAI


od. This is because the grid‐based method and the particle method have different evaluation methods of transport concentrations. In the particle method, the vertical distribution of the sediment concentration is calculated, therefore transport concentration is lower than bulk concentration. Result comparison of calculation time of PBS and PBS‐GBS methods shows that the number of calculated particles decrease, and the calculation time is shortened by limiting the calculation region of the particle method. The calculation time is proportional to the number of particles. Therefore, PBS‐GBS method is particularly effective in the case where the particle method is applied locally, such as evaluating the effect of the check dam.

Key words

debris flow, moving particles simulation, grid‐based simulation, coupling method