洪涝灾害与地形的相关性研究——以肇庆市为例  

Correlation between flood disaster and topography:a case study of Zhaoqing City

作　　者：谢立华[1] 赵寒冰[1] 

机构地区：[1]华南农业大学信息学院,广东广州510642

出　　处：《自然灾害学报》2013年第6期240-245,共6页Journal of Natural Disasters

基　　金：广东省科技计划项目(2010B020315020)

摘　　要：影响洪涝灾害发生的因子很多,除了触发因子降水外,内部因子河流密度、地形起伏等也是不可缺少的条件。为研究地形起伏与洪涝灾害发生的关系,在GIS技术的支持下,对地形因子进行分级,并利用贡献率法研究了地形因子对洪涝灾害的影响,定量地给出了两者的关系。结果表明,研究区内地形因子分级的前3级对洪涝淹没面积的贡献率达到了96.14%;贺江上游以及西江、绥江等下游地势较低区域容易发生洪涝灾害。从定量角度说明了地形绝对高程越低、地形变化程度越小,也就越容易发生洪涝灾害,研究结果将为洪涝灾害风险评估和灾害预测等灾害理论提供依据。Many factors influence the flood disaster. Besides triggered factor -precipitation, the internal factors, like river density and topographic relief, are also indispensable conditions. To study the relationship between topographic relief and flood disaster, with the support of GIS technology, the paper classifies the terrain factors, studies the influence of terrain factors on the flood disasters by rate method, and finds the relationship between them quantitatively. Results show that, in the research area, the contribution rate of the first three levels in the classification of terrain factors reaches 96.14% for flood inundation area; the lower areas, like the upper reach of Hejiang River, the lower reach of Xijiang River and Suijinag River, are subject to the flood disaster. The results quantitatively state that, the lower the terrain absolute height and the less the degree of terrain changes, the more vulnerable of the flood disaster. The results of the study could provide a reference for disaster theories on flood disaster risk assessment, hazard prediction and so on.

关 键 词：洪涝灾害 地形 贡献率 GIS 

分 类 号：X43[环境科学与工程—灾害防治]