基于 ArcGIS 技术的榆林市冰雹灾害风险区划

摘要

The frequency and times of hail disaster, population, GDP and farm land distribution affecting hail occur-rence were chosen as the estimation fac-tors in the zonation and assessment of hail disaster in Yulin based on the data of hail disaster from 12 meteorological stations during 1951 -2010 and from Yulin Municipal Bureau of Civil Affairs during 1951-2012, land use types of ev-ery county and district in 2012, social statistic data, etc. The hail sensitivity, disaster hazard and vulnerability were calculated by using ArcGIS spatial anal-ysis, and then the hail risk zonation of Yulin was obtained. These results helped to improve the ability of prevention and control of hail disaster in Yulin.%以榆林市辖区内12个县级气象观测站1951—2010年冰雹灾害记录，1951—2012年榆林市民政局统计的县域冰雹灾情数据，2012年榆林市各县区土地类型数据，以乡镇为单元的社会统计数据等资料为基础，通过1∶250000 DEM 数字高程模型进行分析模拟，选取与冰雹有影响的地形因素，统计冰雹频次、人口、GDP、耕地分布等作为评价因子，应用 Ar-cGIS 的空间分析功能，分别计算冰雹灾害的敏感性、危险性、易损性，建立分因子的风险区划模型，在此基础上进行加权叠加，形成榆林市冰雹灾害风险区划，有助于提高榆林市冰雹灾害的风险防控能力。