基于GIS的区域集水指数分析——以潮田河流域为例

为研究岩溶发育区域的流域集水情况，采取遥感（RS）和地理信息系统（GIS）技术对潮田河流域进行分析，以区域环境指标地形指数、地表指数和植被指数为主要参数，构建基于栅格的综合集水指数评估模型。结果表明：潮田河流域集水综合指数平均值为2.91，区域的汇水权重为地形（0.423 52>）植被（0.296 91） >地表（0.219 55），地形状态指数对流域集水影响最大，地表状态指数和植被状态指数影响较小，岩溶发育强烈和水系密度偏差区域分布在集水综合等级低于III级的区域。

Analysis of regional catchment index based on GIS: An example of the Chaotian river basin

In order to evaluate the catchment situation more effectively，a comprehensive catchment index evaluation model based on grid was constructed by remote sensing（RS） and geographic information system（GIS）for the Chaotian River basis. It took topographic index，surface index and vegetation index as main parameters. The results show that the average value of regional catchment comprehensive index is 2.91，and the magnitude order of catchment weights is topography（0.42352）> vegetation（0.29691）> surface（0.21955）. The topographic state index has the greatest influence on catchment，while the surface state index and vegetation state index have relatively little influence. The areas with intense karst development and deviation of water system density are distributed in the areas with catchment comprehensive grade lower than III.