CONSIDERATION ON INFLUENCE OF LEVEE MATERIALS AND MANAGEMENT CONDITION ON EROSION PROOF STRESS IN OVERFLOW

Abstract

The inundation risk in an area influenced by tributary backwater is evaluated and determined by the most vulnerable section to overtop in both levees of the main and tributary stream. Thus, it is important to evaluate the resistance against the erosion caused by overtopping of all the linked levees for the purpose of disaster mitigation.

In this study, we compared the vegetation root density, the construction histories , levee materials, and the level of management of levee such as the frequency of weeding in both of the sections where had experienced breach and had not. From this comparison, we assessed how each index influenced the erosion resistance of the levees and analyzed how to increase the erosion resistance against overtopping for the future studies.