【摘要】 西藏及邻区从地貌、晚新生代沉积物、岩石圈构造及地震活动性等方面与其它地区截然不同,构成了其独特的地质背景。研究表明,地质灾害的分布受地质背景和人类工程的控制与影响,不同的地域条件发育的地质灾害类型及程度具有不同的特点。通过对影响该区崩滑流地质灾害发展趋势的三个主要因素的分析,预测21世纪初期近二十年期间,该区崩滑流将进入一个高潮期。由于区域地下水位的持续下降和气候向干旱化发展,土地沙化、草场退化及多年冻土退化短期内将趋于恶化。更多还原

【Abstract】 Tibet and its vicinity is varied from other regions in physiognomy、later-Cenozoic sediment、tectonism、seism activity and other aspects,these forms its particular geologic background.Study shows that geohazard distributing is controled and influenced by geologic background and human engineerings,varied zone develop varied geohazard type and degree.Through analysing three main factors which influences geohazard evolvement,this paper forecasts that almost 20 years in the early 21 centuries,landslide、collapse and debris flow will come into a high tide period.Because of regional underground water level continual dropping and climate changing to aridity,land desertifacation and degeneration of glassland and tundra will tend to worse in short period.更多还原