城镇化进程中水电站建设对河流连通性的影响研究与实践

Research and Practice on the Influence of Hydropower Station Construction on River Connectivity in the Process of Urbanization

河流连通性具有纵向、横向、垂向和时间4个维度特征,其中纵向维度(即纵向连通性)在城镇化进程中受人类活动干扰最多、影响最普遍。基于国内外河流纵向连通性在概念、研究机制、计算方法等研究与实践的基础上,以广东省云浮市南山河流域为例,采用VCI法、阻隔系数法、改进阻隔系数法、DCI法定量评估水电站建设对河流水系纵向连通性的影响,通过计算每个水电站对连通性的影响,有针对性地提出恢复河流连通性的建议,为水利水电开发建设和中小型流域水系管理提供可参照的模式。

River connectivity features longitudinal,lateral,and vertical dimensions,as well as time.Specifically,the longitudinal dimension(longitudinal connectivity)is highly disturbed and widely affected by human activities in the process of urbanization.Based on the research and practice of the longitudinal river connectivity both in China and abroad in terms of concepts,research mechanisms,and calculation methods,this paper took the Nanshan River Basin in Yunfu city,Guangdong Province as an example and adopted the VCI,barrier coefficient,improved barrier coefficient,and DCI methods to quantitatively evaluate the influence of hydropower station construction on longitudinal river connectivity.In addition,by calculating the impact of each hydropower station on the connectivity,the paper proposed suggestions for restoring the river connectivity in a targeted manner,which provides a reference model for the development and construction of water conservancy and hydropower and the management of small and medium-sized river basins.