基于云模型的平原河流生态系统健康评价

Assessment of River Ecosystem Health in Plain River Network Using Cloud Model with Improved Order Relation Analysis

河流生态系统健康评价是河流生态系统治理的基础。为评估平原河网地区河流生态系统健康状况,结合平原河网地区河流的特性,从河流水文、河流形态、河岸带、水体理化、河流生物和社会服务功能6个方面,构建平原河流生态系统健康评价指标体系;确立健康、亚健康、不健康、病态、重度病态5个评价等级;采用改进的序关系分析法确定各指标权重,建立基于云模型的平原河网地区河流生态系统健康评价模型。以典型平原河网地区河流——水阳江(高淳段)为研究对象,评价其河流生态系统健康状况。将改进的序关系法-云模型结果与模糊层次分析法评价模型结果进行对比。结果表明:改进后的方法可降低评价过程中的主观性,充分体现模糊性和随机性,评价结果合理,符合实际。

The basis of managing river ecosystem lies in the assessment of river ecosystem health.A cloud model for assessing the health of river ecosystem in plain river network area is presented.The index system of the assessment model includes six aspects:river hydrology,river morphology,riparian zone,physical and chemical properties of water,river biology,and social service function;the weight of each index is determined via improved order relation analysis.The health of river ecosystem is classified into five levels:healthy,sub-healthy,unhealthy,ill-conditioned,and severely ill-conditioned.The model was applied to the Shuiyang River(Gaochun Section),a typical river in plain river network area,as a case study,and the result was compared with that of the fuzzy analytic hierarchy process model.The comparison demonstrates that the cloud model with improved order relation reduces the subjectivity while fully reflecting the fuzziness and randomness in the evaluation process.The assessment results are reasonable and comform with the reality.