STUDY ON PRIORITY OF EMERGENCY RESTORATION WORK REACHS FOR RIVERINE LEVEE SYSTEMS AFTER EARTHQUAKE DISASTER

Abstract

 When the many sections of riverine levee systems are damaged due to a large-scale earthquake, it is necessary to allocate limited restoration materials and personnel appropriately, and ensure the safety of the area against floods as soon as possible. It is necessary to promptly estimate potential flood damage under the conditions where the levee system is damaged for deciding the priority of emergency restoration work sections. In this study, we developed a calculation program that can quickly estimate potential flood damage during an emergency restoration period while considering risk transfer from upstream to downstream. By test applying the program to a model area, it was shown that the restoration scenario which prioritizes the reaches where the flood risk reduction effect is large has a greater flood risk reduction effect than the scenario which prioritizes the reaches where the flood discharge capacity is small.