辽河流域典型控制单元水环境承载力评估与预警

Evaluation and early warning of water environment carrying capacity of typical control units in Liao River Basin

新常态下,亟须开展辽河流域水环境承载力评估,以满足国家新时期对流域水环境管理工作的要求。针对辽河流域特点,选取流域内3个典型控制单元,采取目标-准则-指标层级关系框架建立水环境承载力指标体系,耦合多种数学模型,对控制单元水环境承载力现状进行评估,提出不同控制单元分阶段水环境承载力提升方案,并确定控制单元水环境承载力最佳阈值。结果表明,3个控制单元水环境承载力指数介于0.10~0.55之间,总体呈超载状态。3个控制单元调整方案均可实现水环境承载力的提升,同时控制单元水环境承载力阈值也可为辽河流域水环境管理提供支撑。

In order to achieve the new demand of water environmental management in the basin,the evaluation of water environmental carrying capacity is needed urgently.Based on the characteristics of Liao River Basin,taking three control units of Liao River as examples,the water environmental carrying capacity index system is established by three-layer frame designing(goal layer-criterion layer-index layer)and the assessment is carried out to combine with multiple mathematical models.Then the lifting schemes in different stages are designed and the threshold values of control units are obtained.The results show that the water environmental carrying capacity indexes of the control units range from 0.10 to 0.55,indicating an overload situation.The solutions to the control unit can improve the overall level of water environmental carrying capacity.The proposed threshold values of water environmental carrying capacity also support the regional water environment management.