ハイドロフォン・濁度計等を活用した天然ダム監視観測方法について

抄録

In 2011, by typhoon Talas, a lot of deep-seated landslide occurred. And they made some landslide dams. The break of landslide dam causes great damage in downstream basin. To prevent the damage, the monitoring and observation of landslide dams are needed. Then we discuss the way to monitor and observe landslide dam with hydrophone, and turbidity and so on.

As a result, we found that the changing for the situation of erosion in upstream basin of observation site affects the relationship between water level and bed load sediment. For example, in 2017, typhoon Lan, while the erosion proceeded, the amount of bed load sediment was increasing. And in the middle of event it showed the increasing of bed load sediment without increasing water level. It may indicate that around that time, the erosion of landslide dam has proceeded rapidly. Therefore we will continue to observation, and we would like to develop the way to monitor and observation landslide dam.