2、然断点法及经验订正法,将全市暴雨灾害划分为高风险、次高风险、中风险、次低风险及低风险5个等级。区划结果表明:榆林市北部府谷、神木县和南部子洲、吴堡县暴雨多发,灾害风险等级最高;西部定边、靖边暴雨最少,灾害风险等级最低。关键词:暴雨灾害;区域自动气象站;GIS技术;风险区划YulinStormDisasterRiskZoningBasedonArcGISAbstract:Summarizes the Storm Data from 1951 to 2012 of 12 counties’ Weather station a
3、nd their 162 regional automatic weather stations in Yulin City, Shaanxi Province, divided the rainstorm level according to the percentile method, combined with the city's annual precipitation distribution characteristics and topography, economy, population inform
4、ation determine the the storm disasters zoning factor, Small grid simulation the zoning factor by ArcGIS, and give different weights, get the distribution of rainstorm disaster in Yulin city by comprehensive operation. Division of the rainstorm disaster into 5
5、grade by natural breakpoint method and empirical correction method. The divisions results show that: Fugu and Shenmu County in north, Zizhou and Wubao in south of Yulin have rainstorm multiple, which means a highest level of disaster risk; Dingbian and Jingbian i
6、n west of Yulin have less frequent rainstorm, disaster risk in a lowest level.Keywords:stormdisaster;regionalautomaticweatherstation;GIStechnology;riskzoning1榆林暴雨的气候概况陕西省榆林市暴雨出现概率是0.64站(次)/a,主要集中在7—9月份,大部分暴雨具有局地性强、历时短、灾情重的特点,占暴雨总次数的72%。9根据榆林市12县区气象站1951~2011年观测资料