CRITICAL HYDROLOGIC CONDITION FOR OVERFLOW BURST OF MORAINE LAKE
JIANG Zhong-xinl, CUI Peng2, JIANG Liang-wei3
1. The No.2 Survey and Design Institute of MOR; 2. Institute of Mountain Hazards and Environment, the Chinese Academy of Sciences; 3.Chengdu University of Technology
Abstract：Flood water and debris flow caused by glacial lake burst caused by glacial landslide falling into the lake is a serious mountain disaster in glacial area of (Tibet). After the experiment formula calculating threshold flow velocity of non-uniform sand was gotten, with d95 of the glacial till in the dyke can be threshold sizes, calculation formula of critical height (H0)of overflow head was guided. Then, calculation formulas of ascendant height (H1) of lake water surface and surge height (H2) on burst mouth caused by glacial landslide falling into moraine lake are guided. Therefore, critical hydrologic condition of moraine lake burst with overflow type are: the burst is inevitable as H1>H0;the burst is possible as H1
2004, Vol. 21 
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