Landslide dams form in a wide range of physiographic settings. The most common types of mass movements that form landslide dams are slumps of rock and soil; ladslides; debris flow triggered by earthquakes and excessive rainfall. Most landslide dams are remarkably short-lived. When a landslide dam collapses or is overspilled, the sudden release of stored water augmented by higyly concentrated sediment due to rapid erosion of the dam body can lead to a flood which may cause a great destruction to property and potential loss of lives downstream.
Prediction of maximum discharge and total sediment runoff of such a flood is essential to examine countermeasures, yet no comprehensive investigation has ever been undertaken. This paper, conceived in response to the importance of the problem, addresses the process of erosion of dam body and the sediment transport mechanisms, proposes a method to obtain the hydrograph and sediment concentration in the flow. Further, the results such as follows will be presented.
1) Hydrographes of the flood discharges and the sediment transports due to landslide dam failures,
2) Diagram for predicting the starting time of dam failures,
3) Diagrams for predicting the peak discharge,
4) Prediction method of inundated location and the evaluation of the dangerous rank,
5) Countermeasures.
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