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建立了耦合入渗带与潜水层的地下水渗流和石油污染物迁移的数学模型 ,给出了模型的数值解。针对可变潜水面边界给出了节点变性和迭代求解方法。在认识大庆宋芳屯油田基本条件的基础上 ,运用实际地质、水文地质条件和上述模型 ,对宋一联合站含油污水外排环境的污染范围、程度和自净作用进行了模拟分析。含油污水外排不仅造成土壤的严重污染 ,而且由于土壤自净能力的降低 ,最终将使污水以原生浓度进入含水层。由于含水层处于饱水状态 ,生物降解能力和对污染物的吸附能力不如表层土壤 ,因此 ,污染物将在很长的时间内存在于含水层之中。本研究对含油污水外排所造成的土壤和地下水污染提供了定量评价方法。
A mathematic model of groundwater seepage and petroleum pollutant migration coupling between infiltration zone and submersible zone was set up and the numerical solution of the model was given. A method of node denaturation and iterative solution is given for the variable diving surface boundary. Based on the understanding of the basic conditions of Daqing Songfangtun Oilfield, the actual geologic and hydrogeological conditions and the above model were used to simulate the pollution extent, degree and self-purification of polluting environment of the oil-bearing sewage in Songyihe United Station. Exhausting of oily wastewater not only causes serious soil pollution, but also results in the initial concentration of wastewater entering the aquifer due to the reduction of soil self-purification capacity. Because aquifers are saturated, biodegradability and ability to adsorb pollutants are not as strong as the topsoil, so contaminants will persist in aquifers for an extended period of time. This study provides a quantitative assessment method for soil and groundwater pollution caused by the efflux of oily wastewater.