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《Scientia Geographica Sinica》 1998-03
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THE CHARACTERISTICS AND VERTICAL ZONESPECTRUM OF NATURAL DISASTERS IN THETIANSHAN MOUNTAINS, XINJIANG

Xiong Heigang (Geography Department, Xinjiang University, Xinjiang, 830046)Liu Gengnian Cui Zhijiu (Geography Department, Peiking University, Beijing, 100876)  
With the mountain elevation increase and climate condition change, the rule of distribution, happening and development of the various natural disasters, which is caused by climate, produce some change and form the vertical zone spectrum of special mountain natural disasters. This research is helpful to finding effective variety measures of prevention disasters, avoiding and reducing the harm of natural disasters. There are 12 types of disasters in Tianshan Mountains, they can be divided three zones.1. Base zone (torrential rain-collapse zone): The various disasters of this zone are caused by sudden precipitation in the low-middle mountain of the arid area. The disasters occur mainly from May to August. Thus, the frequency period of their hurst is simultaneous with the maximum period of precipitation in every year.2. Middle zone (snowmelt water-icing zone): Most disasters, which happen in the middle-high mountain area, have close relation with variation of temperature. The kinds of disasteres include destruction of thawing snow water, iceing damage, glacial debrisflow, glacial lake burst, thawing sinking, snow drift of middle mountain and middle mountain avalanche.3. Upper zone (snow drift-avalanche zone) : The movement of snow creates disaster in this zone. There are snow drifts of high mountain above the wooded-line in mountain and the avalanches of high mountain, which is above 3500 meters and mainly form in summer.
【Fund】: 国家自然科学基金(49671075)及中国科学院天山冰川观测实验站基金资助项目
【CateGory Index】: X43
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