水系连通的类型及连通模式

Types and modes of water system connectivity

水系连通是保证河流系统健康完整、功能正常发挥的重要条件,水系连通性衰退问题备受社会关注。为了深入了解河流系统的连通性,基于河流系统的组成单元和主要功能,系统分析了水系连通性的内涵、连通类型和连通模式。水系连通性的内涵包括边界的流畅性和稳定性、水流的连续性和流动性、泥沙的输移和交换以及生物的生长繁衍与多样性。水系连通可分为河道连通、水系连通及流域间水系连通三个层次;进而提出了主流连通模式、分-汇流连通模式和滩槽连通模式等3种连通模式,并讨论了各种连通模式的关键问题。

The river system connectivity is one of important condition for the health and integrity of the river system.The river function and its decline have caused wide social concern.For the more thorough understanding of the river system connectivity,its connotations are analyzed based on the main functions and constitutional unit of the river system,which includes the fluency and stability of the boundary,continuity and mobility of the flow,transport and exchange of sediment load,and the biological multiplying and diversity.In addition,three levels of the river system connectivity are summarized,that is,the connectivity of channels,the connectivity of rivers in the basins,and the connectivity of drainage systems.Three analysis modes are channel connectivity mode,diversion-convergence connectivity mode,and floodplain-mainstream connectivity mode.Finally,the key problems of various models are discussed.