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山区镇域山洪灾害危险性分区研究――以跳石镇为例

DOI: 10.13577/j.jnd.2015.0312, PP. 90-96

Keywords: 山洪,危险分区,镇域,跳石镇

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Abstract:

山洪对山区人们的生命和财产安全构成了严重的威胁,近年来的一系列山洪灾害造成了重大的人员伤亡和财产损失,严重制约了山区社会经济的可持续发展。以重庆市巴南区跳石镇为研究范围,针对山区镇域山洪灾害的形成特点,构建了由微地貌类型、地形坡位、汇流累积量和植被覆盖度等组成的山区镇域山洪危险分区指标体系,并在ArcGIS平台支持下,通过相应方法获取研究区危险分区指标数据,利用建立的镇域山洪危险分区模型计算得到各评价网格单元山洪危险综合指数并据此进行了综合分区。研究结果表明:跳石镇山洪灾害以低危险和中危险等级为主,分别占总面积的40.12%和34.23%,而中危险区和高危险区共占总面积的47.37%;居民房屋位于中危险和高危险区范围内的面积达846427.9m2,占房屋总面积的45.40%;在汛期,跳石镇防治山洪的任务较繁重。研究成果可为跳石镇的山洪灾害防灾减灾提供决策依据,同时也可为山区镇域山洪灾害危险分区提供理论参考。

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