基于组合赋权模糊物元可拓模型的渭河流域甘肃段河流健康评价

River health evaluation in Gansu section of Weihe River Basin based on combined weighted fuzzy matter-element extension model

从水文完整性、化学完整性、形态结构完整性、生物完整性及社会服务功能5个准则层出发,构建了渭河流域甘肃段河流健康评价指标体系;采用基于改进层次分析法和Critic法的组合赋权法和模糊物元可拓模型计算河流健康状况评价等级,对渭河流域甘肃段河流健康状况进行了评价,并结合障碍诊断模型,分析了该研究区域河流健康突出问题。结果表明:2017—2019年渭河流域甘肃段干流河流健康等级均为亚健康状态,且呈现小幅好转趋势;5个准则层中化学完整性表现最差,流域治理应重点关注河流水质治理;评价河段的敏感度指标与水文、化学、生物完整性相关,是提高河流健康水平最有效的敏感因子。

Based on the five criteria of hydrological integrity,chemical integrity,morphological structure integrity,biological integrity and social service function,the river health assessment index system for the Gansu section of the Weihe River Basin was constructed.The combined weighting method based on the improved analytic hierarchy process and the Critic method,and the fuzzy matter-element extension model were used to calculate the assessment grade of the river health.The river health in the Gansu section of the Weihe River Basin was evaluated and the prominent problems of water health of the Weihe River were analyzed with the obstacle diagnosis model.The results show that from 2017 to 2019,the health levels of the main stream of the Gansu section of the Weihe River Basin were in a sub-health state but with a slight improvement trend.The chemical integrity of the five criteria layers was the worst,indicating that the watershed management should pay more attention to the river water quality management.The indicators for assessing the sensitivity of river sections are related to the hydrological,chemical and biological integrity,and are the most effective sensitive factors to improve the river health level.