Analysis and evaluation of flood-control functions of wetland taking Dongting Lake as an example
湿地的防洪功能分析评价：以东洞庭湖为例

Wetlands are the most productive ecosysterms which provide functions of hydrology, water quality, food chain and habitats. They also possess social and economic values. Their majar hydrological function is flood control, including flood storage, cutting flood peak down, flood detection, and reducing erosion. In this paper we analyse and estimate quantitatively the flood control functions of the East Dongtinghu Wetland applying GIS, remote sensing data, mathematic simulation, statistical analysis, spacial calculation. The methods for evaluating the flood control functions of wetlands are provided. The area of the East Dongtinghu Wetland occupies 87.9% of the whold East Dongting Lake basin. The water storage occupies 80% of the lake's total. Because of human reclamation and silt deposition, the flood control functions are declining quickly.