SIMULATION OF DEBRIS FLOW CONTROL BY A GRID-TYPE SAGO DAM

Abstract

Recently, many grid-type Sabo dams have been constructed. These dams have functions to pass through sediment transported during normal floods and to store hazardous big boulders transported by a debris flow. In this study, we pay attention to the sedimentation processes of debris flow by a grid-type Sabo dam, and flume experiments and numerical simulations are carried out using stochastic model of blocking by a planer grid-type dam. In this study, the model is expanded into the three-dimensional model and processes of the debris flow generation, development and sedimentation by a grid-type Sabo dam is expressed by the model. This model is found to be very useful to clarify the function of the grid-type Sabo dam.