水利工程对河网连通性的影响研究——以太湖西苕溪流域为例

Study on impacts from water conservancy projects on river network connectivity——a case of Xizhaoxi River Sub-catchment of Taihu Lake Basin

河网连通性对维护河流生态系统的结构和功能具有重要作用,水利工程可改变天然河网的连通性,直接威胁到河流生态系统的健康与稳定。利用空间分析、连续性指标以及树状河网连通性指数等方法,深入探讨了闸坝对河网连通性的影响。结果表明,树状河网连通性指数能够较为全面地分析不同数量、可通过性及地理位置的闸坝对河网连通性的影响,可以广泛应用于流域规划过程中不同方案的比较,从而为水利工程设施的选址及设计提供参考。

The connectivity of river network plays an important role in maintaining the structure and function of fiver ecosystem. However, the water conservancy project can change the connectivity of natural fiver network and directly endanger the stability and health of fiver ecosystem. Based on the methods such as spatial analysis, continuity index, Dendritic Connectivity Index（DCI） , etc. , the impacts from sluices and dams on the connectivity of river network are deeply discussed herein. The result shows that with the Dendritic Connectivity Index（DCI）, more overall analysis can be made on the impacts from the sluices and dams on various geographic locations with various amounts and connectivities. Therefore, this method can be widely applied to the comparison of different alternatives during planning of river basins and then provide a reference for the site selection and design of the water conservancy project and facility concerned.