Scour evaluation and countermeasures for coastal dikes subjected to tsunami overflow under various ground conditions

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K18758
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Rural environmental engineering/Planning
• Research Institution: Kobe University
• Principal Investigator: SAWADA YUTAKA 神戸大学, 農学研究科, 助教 (60631629)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 海岸堤防 / 津波 / 洗堀 / 水理模型実験 / 数値解析

Outline of Final Research Achievements

In the Great East Japan Earthquake, a massive tsunami caused severe damage to coastal structures. It has been reported from field surveys that a local scour at the ground behind coastal dikes was one of causes to a dike failure. Since huge earthquakes are expected in recent future, it is essential to reveal scour process and to suppose effective countermeasures.
In this study, flume experiments and vertical jet flow experiments have been conducted to clarify effects of liquefaction on scour characteristics and to verify the effects of the proposed countermeasures. In addition to the model tests, simple equations have been suggested to predict a scour profile. Since the predicted values are approximately corresponding with field data, the proposed methods have been verified to be effective.

Free Research Field

農業農村工学