基于数值模拟的纳污能力计算方法探讨

以邻苯二甲酸二丁酯(DBP)为典型污染物,采用室内水槽试验、数值模拟及野外示踪试验,分析了水体中污染物降解的主要影响因素,研究了流速、含沙量、粒径等因素对污染物降解过程的影响,并将结果与水质模型进行耦合,提出了新的纳污能力计算方法。分别采用该方法以及《水域纳污能力计算规程》和《全国水资源综合规划地表水资源保护补充技术细则》的计算方法,计算了长江武汉段青山工业用水区DBP纳污能力。结果表明,基于数值模拟的纳污能力计算方法可以解决降解系数取值问题,可为更准确地核定水域纳污能力提供技术支撑。

A Simulation-based Method of Calculating Allowable Permitted Assimilative Capacity of River

With dibutyl phthalate(DBP)as a typical pollutant,a novel method of calculating the allowable permit ted assimilative capacity is put forward.The effects of flow velocity,sediment concentration,and particle size onthe degradation of contaminants in water were analysed through indoor flume experiment,numerical simulation ex periment and tracer experiment in river.And the analysis results were coupled with water quality model to establishthis new method.The allowable permitted assimilative capacity of DBP in Qingshan industrial water functional zonewas calculated respectively by this simulation based method and the given methods from Standard Practice for Cal culating Pollutant Carrying Capacity ofWater and Supplementary Technical Rules for Surface Water Resources Protec tion ofthe National Integrated Water Resources Plan.Calculation results prove that this method solves the problemof the values of degradation parameters,and offers a technical support for confirming the allowable permitted assimi lative capacity of river more accurately.