退田还湖适宜性的评价——以太湖流域洮、滆湖地区为例

Suitability Evaluation of Restoring the Lake From the Land——A case study of the Taohu and Gehu Lake

应用1954～1981年多期航空像片解译获得的太湖流域围湖遥感解译资料和1979年、1991年和2001年3个时相的Landsat数据获得1954～1981年、1981～1991年和1991～2001年3个时段洮、滆湖地区湖泊及环湖土地的利用类型动态变化的相关数据,采用DEM计算获得径流积累量指标,采用Landsat遥感数据提取植被生长适宜度指标和建筑用地量指标,使用上述3个指标并采用层次分析法确定各个评价指标的权重,实现对早期围湖造田地块退田还湖适宜性评价.将评价结果与该地区后期(1991～2001年)湖泊及环湖土地的利用变化进行比较分析,选择出适宜退田还湖的地块,为该地区水土资源合理开发利用提供了科学依据.

In the article, Taohu and Gehu Lake of Taihu drainage area were taken as examples where land-use type changed enormously. The article used the statistic data of polderization in the Taihu drainage area which were acquired from the 1954 - 1981 aero data and the 3 times Landsat data of 1979,1991and, 2001 to extract dynamic land use information around the Taohu and Gehu Lake in 1954 ～ 1981,1981 - 1991and 1991 -2001, DEM was used to calculate the index of flow accumulation and the Landsat data were used to acquire the index of vegetable grow suitability and the index of building quantity. With the help of the three indexes and the APH method, the author can evaluate the suitability of restoring the lake from the land. At last the result of the study was compared with the land use type in 1991 -2001, and the appropriate plot was chosen to restore into lake. The result of the estimate can provide the scientific basis for using the water and land resource around the lake in this area.