An analysis of river health features in Gansu Province and evaluation system reconstruction
River health management is an essential component of ecological civilization construction and a key task of the river chief system.By collecting and analyzing the health evaluation results of 162 representative rivers in Gansu Province,this study employed statistical methods to assess the overall health status and characteristics of rivers,the spatial heterogeneity of evaluation indicators,and the applicability of the current river health evaluation system.The results show that the 1st quartile of the health evaluation score for rivers in Gansu Province is 68.1,the 2nd quartile(median)is 75.1,and the 3rd quartile is 81.4,indicating a relatively good level of river health.Overall,the rivers exhibit stable morphological structures,fluctuating hydrological conditions,relatively good water quality,and low biodiversity.The river health level increases from west to east,closely related to the climatic environment and water resource utilization patterns of the region.To address the inapplicability of standardized evaluation indicators for northwest rivers,a health evaluation system tailored to the characteristics of northwest rivers was reconstructed.Clear and specific definitions were provided for five health levels:ideal,healthy,sub-healthy,unhealthy,and pathological.The system applies indicators across four aspects,including water space,water cycle,water environment,and aquatic organisms,to describe changes in river attributes.Verification results demonstrate that the reconstructed evaluation system improves the coefficient of variation in the criterion layer and key indicators compared to the original system.
river healthcharacterizationriver ecosystemevaluation systemrivers in arid zonesGansu Province
万方数据
维普
