Research on Theory and Method of River Health Assessment

On the basis of comprehensive analysis on connotation, assessment methods and index system of river health, combined with the national river health assessment pilot project, river health assessment system is improved by increasing indicators and correcting their weights. The weights of ecological health and functional health of each zone in the national ecological function zoning are revised. According to each river’s characteristics and ecological function type in water ecological zone, the weights of four indicators (hydrology, physical form, water quality and aquatic life) of ecological health are determined by the procedure of expert proposal initial determination feedback inspection revision. Taking the mainstream of the Yellow River from Huayuankou Station to Gaocun Station as an example, its health condition is assessed by determining weights of ecological health (including the weights of its four indicators in criteria layer) and functional health according to the ecological-functional partition and water ecological zoning it belongs to. The result is at the lower limit of good level.