Abstract
AbstractA rapid method for estimating the peak discharge from a breached landslide dam is developed from an analysis of 42 outburst floods. Systematic classification of the landslide blockages based on their material composition, sedimentological features, and travel distance is used to assess the erodibility of a dam. The erodibility controls the size (height and width) of a breach and the speed at which it forms and, thus, the peak discharge. Three categories or types of obstructions are defined. A regression equation is developed to predict an outburst flood peak discharge based on the blockage type, the dam height, and the volume of impounded water at the time of breaching. Prediction limits are also calculated, which provide a sound statistical assessment of the possible peak outflow range. Knowing the potential consequence of a breach, orderly evacuation of the downstream population when failure of a landslide blockage is approaching can then be carried out.KeywordsLandslideDamBlockageBarrier lakeBreachOutburst floodPeak discharge
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