河流连通性综合评价方法研究

保障河流连通性是生态系统保护与修复的一项重要举措,为推进我国江河湖库水系连通工作,亟需加强河流连通性评价的理论方法研究。基于河流生态系统四维结构和功能整体模型,构建了河流连通性综合评价方法;通过梳理国内外河流连通性评价的研究和实践,从4个维度凝练了构建河流连通性指数的5个评价指标,包括破碎度指数、库容调节系数、水资源利用消耗率、路网密度和城市夜间灯光指数;通过综合分析各个指标的阈值和权重,建立了河流连通性指数计算方法、综合评价方法及评价依据。研究成果进一步完善了河流连通性评价的理论方法,为河流连通性评价提供了一种新的思路,可为河流生态系统保护与修复提供参考。

A Holistic Method of Riverine Connectivity Assessment

Guaranteeing riverine connectivity is of pivotal significance to protecting and restoring ecological system. In-depth research on the theory and methodology of assessing riverine connectivity is in urgent need to promote the linking among rivers, lakes and reservoirs. In this paper, a comprehensive assessment method for riverine connectivity is proposed. Five indicators including degree of fragmentation, coefficient of reservoir capacity regulation, water consumption rate, road network density, and nightlight intensity in urban areas are chosen to represent the connectivity in longitude, vertical, horizontal and temporal scales. On the basis of analyzing threshold value and weight of the indicators, the connectivity index is put forward to represent holistic connectivity. The assessment standard is also discussed to provide reference for river connectivity restoration. This research result will provide new ideas for the practice of river ecosystem protection.