The way of urgent works against large landslide dam

Abstract

Urgent works, which should be done just after large landslide dam formation, are very important to prevent landslide dam brake, therefore we have to conduct and complete the urgent works in short time although facing many difficulties. But unfortunately we had not haven effective method about like this urgent works against large landslide dam until the terrible disasters, typhoon Talas, Sep. 2011, in which the large landslide dams were caused in Kii peninsula, Nara and Wakayama prefecture, so that it was very hard to get progress and manage the works, and we had to have many trials to complete the urgent works. The review of these trials is necessary to establish the effective way of urgent works against large landslide dam. Therefore I reviewed these works and what methods should be applied to urgent works against large landslide dam. As results, to construct temporary channel effectively, and to get the method to reduce water level of landslide dam lake are important.