Taking the plain river network area of the Taihu Lake Basin as an example, starting from the basin water ecological safety concept of river development and protection, and based on the hydrology and hydrodynamics; the characteristics of the water ecological environment of the water system in the plain river network area; the development, construction, and operation conditions of water conservancy projects; and the effects on the water ecological environment, the water conservancy projects were classified, and the effects of different water conservancy projects on the hydrology and hydrodynamics, water environment quality, hydrobios, and benthos were identified. The main evaluation indexes of the water ecological environmental impact assessment of the water conservancy projects were put forward. The evaluation index system of the water ecological environment of water conservancy projects in the plain river network area was established.%以太湖流域平原河网地区为例,从河流开发与保护的流域水生态安全概念出发,基于平原河网地区水系的水文水动力、水生态环境特征,根据水利工程的开发建设及运行状况,及其对水生态环境产生的不同影响,对水利工程进行分类,分别辨析不同水利工程对水文水动力、水环境质量、水生生物、底栖生物的影响,提出水利工程水生态环境影响评价的主要评价指标,构建平原河网地区水利工程水生态环境效应评估指标体系.
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