基于CRITIC法的平陆运河内河段生境健康评价

Habitat Health Assessment of the Inland Section of the Pinglu Canal Based on the CRITIC Method

广西平陆运河是珠西流域连接北部湾港的亿吨级水运交通大动脉,科学合理地评估平陆运河内河段生态健康状况,可以为水利及生态环境规划建设提供依据。作为监测水体健康状况和指导受损水生态修复和保护的重要手段,河流健康评价一直是研究重点,但缺少量化综合指标的研究。以大致涵盖了钦江和沙坪河两大流域的5个测样点为例,构建了平陆运河内河段生境健康量化评价体系。通过平陆运河河流健康为基准,分别从水生生物指标、水文指标、水质指标、河流形态指标4个准则层构建平陆运河内河段河流健康评价指标体系,确定13个评价指标。由于CRITIC权重法能够基于评价指标的对比强度和指标之间的冲突性来综合衡量指标的客观权重,明确地表征平陆运河内河段生境健康状态,将基于CRITIC权重法对平陆运河内河段的健康状态进行综合评价。研究结果表明:平陆运河内河段测样点中健康状态的点位有2个,亚健康状态的点位有3个,无一般、差、极差的点位,总体上平陆运河内河段生境健康状态整体处于健康状态。最后根据评分等级探讨了平陆运河建成后在水生生物指标、水文指标、水质指标、河流形态4个准则层方面分别有哪些变化与亟需解决的问题,针对性地提出了对平陆运河内河段生境修复的对策与建议。

The Pinglu Canal in Guangxi is a 100-million-ton water transportation artery connecting the Beibu Gulf Port in the western Zhuhai Basin.Scientific and reasonable assessment of the ecological health of the inland section of the Pinglu Canal can provide a basis for the plan-ning and construction of water conservancy and ecological environment.As an important means to monitor the health of water bodies and guide the restoration and protection of damaged water ecology,river health assessment has always been a research focus,but there is a lack of research on quantitative comprehensive indicators.In this study,we took five sample points as an example,which roughly covered the two major basins of the Qinjiang River and the Shaping River,so as to construct a quantitative evaluation system of habitat health in the inner section of the Pinglu Canal.Based on the river health of the Pinglu Canal,this paper constructed a river health evaluation index system in the inner section of the Pinglu Canal from four criterion layers:aquatic biological index,hydrological index,water quality index and river mor-phological index,and determined 13 evaluation indicators.Since the CRITIC weight method can comprehensively measure the objective weight of the indicators based on the contrast intensity of the evaluation indicators and the conflict between the indicators,and clearly charac-terize the habitat health status in the inland section of the Pinglu Canal,this method is adopted.The results show that there are 2 sites in the healthy state and 3 sites in the sub-health state in the sample points of the inner section of the Pinglu Canal,and there are no general,poor or extremely poor points.On the whole,the habitat health status of the inland reach of the Pinglu Canal canal is in a healthy state.Finally,the changes and problems that need to be solved urgently in the four criterion layers of aquatic biological index,hydrological index,water quality index and river morphology after the completion of the Pinglu Canal are discussed.In this paper,the countermeasures and sugges-tions for habitat restoration in the inland section of the Pinglu Canal are put forward.