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《Journal of Jilin University(Earth Science Edition)》 2011-05
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Analysis to the Lahars Extent in Changbai Mountains by Numerical Simulation

WAN Yuan,XU Jian-dong,LIN Xu-dong,PAN Bo Institute of Geology,China Earthquake Administration,Beijing 100029,China  
The core model of LAHARZ is a semi-empirical numerical model based on the hydrodynamics model and combination with the analysis on the lahars of nine volcanoes.The lahars in four high easy-happening rivers,Erdaobai River,Songhua River,Yalu River and Tumen River,are simulated by the LAHARZ based on the 1∶250000 digital elevation model.The threshold of the energy cone is set to 0.07 according to historical plume height and the average slope.By comparing and matching the simulated river with the real river,the river threshold value is determined to be 5 000.And the volume thresholds are defined as 108m3,109m3,1010m3,and 1011m3 by their historical lahar volumes.The simulated results show that the flow distance and the damage scale were influenced by the different thresholds,which is similar with the historical lahars' extent.The damage grades are divided into four levels as 40 km,70 km,80 km and 100 km.It is important for the planning and construction in the Changbai Mountain area.In addition,this disaster zoning model and method can be used to be the reference of other volcanoes.
【Fund】: 国家自然科学基金项目(40972209);; 中国地震局行业专项项目(200708-27)
【CateGory Index】: P642.23
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