甘肃省30年来崩滑灾害特征

Characteristics of Collapse and Landslide Disasters in Gansu Province within 30 Years

甘肃省是我国地质灾害最严重的省份之一。通过广泛的资料搜集,对1981―2010年甘肃省102起灾害性滑坡和15起灾害性崩塌进行分析,结合地质、降雨等条件研究了甘肃省30年来崩滑灾害的分布特征。结果表明:时间上1981―2000年年崩滑次数在2次左右,2000年以后的灾害次数大体呈持续上升趋势;空间上崩滑灾害主要分布在甘肃中部、东部及东南部,且兰州市的崩滑灾害密度远大于其它地区;崩滑灾害的成因是复杂的地质环境和人类工程活动等多因素综合作用的产物。研究结果对提升甘肃省崩滑灾害预警预报水平和指导防灾减灾工作有一定的参考价值。

Gansu is one of the provinces which are severely effected by geological disasters.Through widespread collection of data and analysis on 102 catastrophic landslides and 15 catastrophic collapses happened in Gansu during 1981―2010, and in association with the geological conditions and rainfall,the distributing characteristics of collapses and landslide within 30 years in Gansu province are studied.The results show that the yearly frequency of collapses and landslides during 1981―2000 was about twice,but it appeared to be on the consecutive rising trend after 2000.In space,the disasters of collapses and landslides were mainly distributed in the central,the east and the southeast of Gansu province,especially the intensity of disasters in Lanzhou city was much higher than other areas.The mechanism of collapse and landslide are complicated,which are combination of many factors like complicated geological environment and mankind＇s engineering activities.The result can enhance the level of alarm and forecast of collapses and landslides disasters,and provide some constructive suggestions about prevention disasters in Gansu province.