基于层次分析法的城市河流生态修复评估

城市的发展改变了许多河流的自然水文环境，并导致河流生态系统中水质、物理生境和生物完整性下降。评估受损河流水体修复的效果，需要结合物理、化学的参数，以及对生物结构、多样性和过程的影响。构建了包含河流水力、水质、水生生物、河岸带及物理结构5个方面15个指标的城市河流生态修复评估指标体系，运用群组决策的层次分析法(AHP)，确定了各指标的权重，重要性排序前5位依次为：水质污染指数、鱼类IBI、水源补给量、藻类多样性、透明度。并以我国南方城市岐江河整治修复状况为例进行综合评价，结果表明,河流生态系统修复评估结果为可以接受，体现了河流整治工程使河流水质、生态的状况有所改善，但河流生态系统恢复需要较长的周期，修复初期生态系统仍处于受损状态。〖

EVALUATION OF URBAN RIVER ECOLOGICAL REMEDIATION BY USING ANALYTICAL HIERARCHY PROCESS

Development of cities has caused changes to the natural hydrology and environment of many rivers，and resulted in decrease of water quality,physical habitat and biological integrity of river ecosystems.Physical and chemical parameters as well as impacts on biological structure,biodiversity and biological process should be taken into considerations when the effect of river ecological remediation was to be evaluated.In this article，an index system including 15 indicators in five aspects of river hydraulics,water quality,aquatic biota,river coast and physical structure was established for evaluating the effect of ecological remediation of urban rivers.A group decision making model of AHP was employed to determine the weights of the indicators and the first five important ones were average pollution index of water quality,fish IBI,water recharge volume,algal diversity and water transparency in sequence.The Qijiang River in a southern city of China was studied as a case for comprehensively evaluating the effect of river ecological restoration.The result was “acceptable”,which showed that remediation engineering would make improvements on the water quality and ecosystem of river,though this could be a rather slow process and the river ecosystem would still be in a state of damage at the early stage of remediation.〖