NUMERICAL STUDY ON RELATIONSHIP BETWEEN 3-D CHANNEL FLOW AND BANK PROTECTION DAMAGE IN MOUNTANOUS RIVER FLOOD

Abstract

This study investigates the relationship between the impacts of the flood channel flow and the damage of the bank protection in the mountainous river using the 3-D channel flow model, iRIC NaysCUBE, for the case of the flood disaster in the Tadami River in 2011.

First, we applied the 3-D model to the flood flow and then verified the applicability of the model using the recorded water level data. Second, we investigated in the site the actual damages of the bank protection for the flood disaster. The calculated hydraulic parameters such as flow velocity, turbulence energy, and pressure to the bank protection, were thus compared with the location and the extent of the flood damage. As a result, the extent and magnitude of the damage can almost be explained by the hydraulic parameters, but the considerations of the overflow, the shape and strength of the bank protection could not be ignored.