摘要
在ARC/INFO的支持下,利用1∶5万的DEM,1∶25万全国数字化地形图,以及定边、靖边、子长和延川4县1∶10万土地利用图与多年水文统计资料,通过叠加分析,对西气东输工程沿线陕西段的洪水风险进行了评估。选取地形、降水、土地利用和社会经济易损性4个因子进行综合分析,分别得到了它们对洪水影响的栅格图,通过对各栅格图的叠加,得到了洪水风险分级图。结果表明,管线西部的定边和靖边,其降水量较低,海拔较高,村镇密度相对较低,洪水风险较低,主要为1级、2级和3级;管线西部的子长和延川县,其地形起伏大,降水量大,植被覆被较低,村镇密度大,洪水风险较大,主要为4级和5级,风险最高的地区集中在秀延河、永坪川、清涧河、东部丘陵沟壑区河谷平原、黄河周围地区及子长县的大部分地区。
Based on the DEM of 1∶50 000, 1∶250 000 national digital topographical map, land use map of 1∶100 000 and the hydrologic data of counties Dingbian, Jingbian, Zichang and Yanchuan, flood risk assessment in the Shaanxi section along the West-East Pipeline Project (WEPP) was conducted under support of ARC/INFO. Four factors including topography, precipitation, land use and project vulnerability were selected. Firstly three raster coverage maps were made by analyzing the factors. And then the flood risk assessment map was derived by overlapping the coverage. The risk degrees were divided into five levels: Class 1, Class 2, Class 3, Class 4 and Class 5. The result (indicates) that flood risk degrees are mainly Class 1, Class 2 and Class 3 in the west of the Shaanxi section along the WEPP, which characterizes less precipitation, higher elevation and lower town density. The high flood risk degrees are Class 4 and Class 5 in Zichang and Yanchuan Counties, which include Xiuyan River,Yongpingchuan River, Qingjian River, river valley and the region along the Yellow River.
出处
《自然灾害学报》
CSCD
北大核心
2004年第5期75-79,共5页
Journal of Natural Disasters
基金
国家基金委创新群体项目(40321101)
中国石油天然气股份有限公司科学研究与技术开发项目(XQSGQS053)
