Abstract
The modelling results of outburst floods and debris flows, which can possibly occur in the Daraisit River Valley, are presented in this paper. The modelling was carried out according to 2 scenarios: the outburst of Lake Sist, the formation of a debris flow on a large tributary of the Daraisist River. The FLO-2D hydrodynamic model and the modernized transport-shear mudflow model developed by Yu.B. Vinogradov were applied in this study. The evaluation of the outburst flood discharge was carried out on the basis of a bathymetric survey. A digital elevation model (DEM) ALOS PALSAR with a resolution of 12.5 m was used as relief data for the valley, and survey data from an unmanned aerial vehicle (UAV) was applied for the debris flow fan. As a result, maps of the spatial distribution of velocities and depths for the rivers Daraisist and Pyanj were obtained. The most vulnerable areas within the Sist village were also identified.
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