运用GIS平台对甘肃省各地区的自然灾害成灾面积(主要是洪灾和旱灾)进行了分类,以期为全省综合自然灾害风险管理工作提供科学依据.研究结果表明:1)甘肃省各地区自然灾害成灾面积差异很大,且只有定西、庆阳、嘉峪关、甘南和金昌的自然灾害成灾面积类型随年份发展变化不大,其余地区的自然灾害成灾面积类型则随年份发展出现不同变化;2)定西和庆阳是典型的自然灾害重度灾区,天水、陇南、平凉和白银偶尔成为重度灾区或中度灾区;嘉峪关、甘南和金昌始终是自然灾害轻度灾区,张掖和临夏州偶尔是中度灾区或轻度灾区;武威和兰州变化比较大,随年份不同可以分别是轻度、中度和重度灾区;酒泉比较特别,除了2000年属于重度灾区外,其余年份都是轻度灾区.
Based on GIS platform,damages due to natural disasters(mainly floods and droughts) in different municipalities of Gansu province are classified to provide a scientific basis for comprehensive natural disaster risk management.The results show that: 1) damaged areas in different municipalities vary widely,and only in Dingxi,Qingyang,Jiayuguan,Gannan,Jinchang municipalities the classes of damaged area change less from year to year,but in the other municipalities they change more;2) Dingxi and Qingyang municipalities are typical severe damaged areas,Tianshui,Longman,Pingliang and Baiyin municipalities are areas of severe damaged occasionally or moderate damaged,Jiayuguan,Gannan and Jinchang municipalities are slight damaged areas always,Zhangye and Linxia municipalities are moderate or slight damaged areas;in Wuwei and Lanzhou municipalities the disasters change a lot,from slight to severe;Jiuquan municipality is rather special,where the disaster is slight but was severe in 2000.