基于GIS的重庆市干旱灾害风险评估与区划

以重庆地区的干旱灾害为研究对象,在分析重庆地区干旱灾害气候背景和经济环境的基础上,从干旱灾害发生的成灾环境、灾害发生的可能性、以及承灾体的易损性三个方面选取了地貌、灾害频率、人口、社会经济等评价因子;应用模糊评价法建立了干旱灾害孕灾背景、灾害危险性、承灾体易损性等数学模型;运用MapInfo Professional软件,通过对属性数据库和图形数据库的操作得到干旱灾害的孕灾背景、灾害危险性、承灾体易损性评价图层,经过图层叠加、斑块合并以及等级划分后得到干旱灾害的风险评估及其区划。

Risk Assessment and Division of Drought Hazard Based on GIS in Chongqing City

Taking the draught disasters in Chongqing as an example, with the adequately analyzing of weather background and population, society, economy in Chongqing, the author chooses these evaluation factors: the physiognomy, the frequency of disasters occurring, the population, the economy from the background of disasters, the possibility of disasters and the vulnerability of stricken things. By using hazy evaluation method, this thesis constitutes mathematics model for the background of weather disasters, the possibility of disasters and the vulnerability of stricken things, and at the same time the evaluation was made. Based on the basis datum and maps, with the utilizing MapInfo Professional software, in manipulating the attribute data-base and graphics data-base, the maps of the background of weather disasters, the maps of the possibility of disasters and the maps of the vulnerability of stricken things were gained. By overlaying and uniting of the maps and compartmentalizing of hazard grade, the hazard attributions for draught disaster were achieved.