五元联系数在长江下游生态航道评价中的应用

针对生态航道评价中存在的模糊、不确定性问题,基于集对分析理论和层次分析法,建立了五元联系数模型,根据生态航道评价指标体系各指标与等级标准的联系程度,构造联系度公式,结合层次分析法计算各评价指标的权重,运用该模型开展了长江下游南京-浏河口段生态航道评价,结果表明,南京-浏河口段生态航道等级为Ⅲ级,其中航运功能、自净功能和景观娱乐功能为Ⅰ级,生态功能为Ⅳ级,需要结合该河段实际情况加强生态环境保护工作。敏感性分析表明,功能层权重的小幅度波动不会对评价结果造成较大影响,说明对该河段的评价结果比较稳定。

Application of five-element connection number to assessment of ecological waterway in the lower reaches of Yangtze River

Aiming at the fuzzy and uncertainty problems in ecolog ical wat erw ay assessment, w e built a five2element connectio n number model o n the basis of AHP ( Analy tic H ierar chy Pr ocess) method and the SPA ( Set Pa ir Analysis) . Accor ding to the co nnection between each index o f the eco log ical waterway assessment index sy st em and the g rade standard, we constr ucted the co nnection degr ee formula, and calculat ed the weight of each assessment index by AHP. The model w as applied t o assess the ec2 o lo gical waterway of Nanjing2Liuhekou reach in the low er r eaches of Yang tze River. T he r esults showed that the health condi2 tion of this ecolog ical w aterw ay w as in Gr ade " III" . The navig atio n functio n, self2purificat ion function, and landscape & enter2 tainment funct ion w ere in Grade " I", while the eco log ical function w as in Grade " IV". It is necessary to str eng then eco lo gical en2 v iro nmental pr otectio n o f the reach. A sensitivity ana lysis indicated that t he assessment results w ere not sensitive t o small2am2 plitude fluctuatio n o f the weig hts o f the function layer, sug g esting that the evaluation results of the Nanjing2Liuhekou reach wer e stable.