青海化隆县地质灾害易发性区划

Zoning of geological disasters of Hualong county in Qinghai province

通过青海化隆县1:5万地质灾害详细调查工作,基本查清了该县境内的地质灾害类型、规模、危害程度及时空展布规律,并进行了地质灾害易发程度分区和风险性评价。(1)县境内共发育地质灾害点438处,其中滑坡243处,不稳定斜坡92处,泥石流沟90条,崩塌13处,其展布主要受控于地形地貌和气候条件。(2)利用GIS信息量模型区划评价了县境内的地质灾害高易发区和高风险区,认为化隆县境内地质灾害高易发区面积占县境总面积的49.1%;中易发区面积占33.5%。;低易发区面积占17.4%。(3)地质灾害高风险区面积占总面积的44.3%;中风险区面积占37.4%;低风险区面积占18.3%。评价区划成果将为当地政府有效开展地质灾害群测群防工作提供基础数据。

Based on the detailed investigation of geological disasters of Hualong County in 2008 by authors,the types,scales,harmful degree and the spatial and temporal distribution of geological disasters within the county had already been identified,and the geological disaster-prone and risk assessment zoning were also been classified.1) There are 438 geological disaster points of the whole country,and the numbers of landslide are 243,the unstable slopes are 92,the debris flows are 90 and the collapses are 13,which are mainly controlled by topography and climatic conditions of the Tibet Plateau.2) The geological disasters high-prone areas are accounted for 49.1% of the total area of the county;and the middle-prone areas are accounted for 33.5%;the low-prone areas are accounted for 17.4%.3) The high risk-assessment areas of geological disasters are accounted for 44.3%;the dangerous areas are accounted for 37.4%;and low-risk areas are accounted for 18.3%.The results of this investigation will give some advises to prevent the geological disasters for the local government.