Health evaluation of the Minjiang River lower reaches based on the segmented comprehensive evaluation method
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Abstract:
In order to study the health evaluation of the tidal river,12 specific aspects including river morphology,hydrology,water quality,saltwater invasion,biological and social service functions were constructed based on the hydrological,water environment and water ecological characteristics of tidal channel.A segmentedcomprehensive evaluation method was proposed to solve the special difference between the natural characteristics and social function of the long river channel.For health[JP] evaluation,the lower reaches of the Minjiang River were taken as an example in this study.The lower reaches of the Minjiang River can be divided into 5 segments,i.e., the dam of Shuikou power stationBifurcated segment,BifurcatedHongshan Bridge (North channel) segment,Hongshan BridgeConfluence (North channel segment BifurcatedConfluence (South channel) segment and ConfluenceMingjiang River mouth segment,respectively.The results revealed that health state of the BifurcatedConfluence (South channel) segment was categorized in subhealth,while the other 4 segments channels and the overall health status of the lower reaches of the Minjiang River were in general grade.Based on the segmentedintegrated river health evaluation model,the grade criteria of river health and the health status of each river segment can be obtained.The use of game theory to optimize the combined weights of indicators can reduce the subjective impact of weight on the evaluation results,which is worthy of further promotion and application.
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