Extraordinary Mountain Slide in Yigong of Xizang and Its Measures for Disaster Mitigation

This article analyzes the reason and themechanism blocking stream of the Extraordinary mountain slide which was occurred in Yigong river of xizang in April 9,2 000.The possible disaster of what the a ccumulated body of the slide intereptedthe stream water is analyzed also.Implementing structural measures and nonstructural measures of the wrecking and disaster mitigation are introduced.