基于GIS的复杂河网区域洪水灾害风险评价

Flood Risk Analysis in Complex River-networks Area Based on GIS

在长江中下游的一些冲积平原区域,由于其气候和地形的特点、历史原因以及人为的活动影响造成其演变成复杂河网区域.实验证明,这种破碎度较高区域经常受到洪水威胁,而其抗灾能力又较弱,该区域自身的特殊性使得对其进行的区域风险评价重要但是困难.在降雨、地形等常规指标不能很好地反映该区域风险等级的基础上,首次引入河网密度、土壤结构以及河网特性等指标对湖南省境内常德冲柳地区进行二级区域风险评价,取得了比传统分析方法更精确更全面的实验评价结果.

There are some flood plants in the middle and lower reaches of the Yangtze River, which become complex river-network areas because of the climate, terrain, history and artificial effect. These areas are frequently threatened by floods, and can not cope with flood disasters, so it is urgent and hard for us to make flood disaster risk zonation in these areas. As general factors, such as rainfall and terrain, can not describe the risk properly in these complex river-networks areas, we have used river-networks＇ density, soil structure and so on to make sub-flood risk evaluation in the case of Chongliu Area in Changde, Hunan. The more the research progress, the more achievements we can get, We have used this way to control and plan flood resources.