多孔介质中污染物运移规律研究及工程应用

发布时间：2019-01-13 09:37

【摘要】：当前,世界各国非常重视地下水污染的问题。有些地区地下水污染已到了相当严重的程度,对生产建设,尤其是对人的健康造成了很大威胁。因此,研究地下水的污染现状,预测其发展方向,制定相应的控制措施以及净化已污染的地下水已成为重要的研究课题。本文概化建立了非稳定流数值模型,利用此模型对济南市区泉域附近地下水进行了数值模拟,得到了济南市区泉域内地下水的时空分布规律及污染物迁移特性。在此基础上,针对某新建项目污染质泄漏对地下水环境产生的影响,通过设置不同的横纵向弥散度对污染物运移特性进行探究。结果表明,在泉群附近区域内,污染物纵向运移过程中对流起主要作用,纵向弥散度的取值影响较小；而污染物横向运移过程中弥散起主要作用,横向弥散度的取值影响较大。本研究成果对泉群附近的地下水环境保护及地下水污染防控具有重要借鉴意义。根据数值模拟的预测结果在项目区内设置不同监测点,并根据监测点处的污染物浓度变化对模型进行识别和验证,验证结果表明模型具有较高的准确性,模型对预测具有较高的指导意义。用建立的概念模型预测了未来20年污染物在地下水中的迁移变化趋势。预测结果表明,未来20年污染物继续向趵突泉方向迁移,污染物浓度继续升高,但到达一个临界值就会趋于平衡,而且此临界值在允许范围内。污染物也会对周围地下水造成一定污染,污染物的扩散速度与周围区域地下水的开采速度有一定的关系,如地下水开采量加大,会加快污染物的扩散。
[Abstract]:At present, countries all over the world attach great importance to the problem of groundwater pollution. Groundwater pollution in some areas has reached a fairly serious level, which poses a great threat to production and construction, especially to human health. Therefore, it has become an important research topic to study the status quo of groundwater pollution, forecast its development direction, formulate corresponding control measures and purify polluted groundwater. In this paper, a numerical model of unsteady flow is established, and a numerical simulation of groundwater near the spring region of Jinan urban area is carried out. The spatial and temporal distribution of groundwater and the characteristics of pollutant migration in spring region of Jinan urban area are obtained. On this basis, aiming at the impact of pollutant leakage on groundwater environment in a new project, the characteristics of pollutant transport are studied by setting different horizontal and longitudinal dispersion degrees. The results show that the convection plays a major role in the vertical transport of pollutants in the region near the spring group, and the value of longitudinal dispersion has little effect, while the dispersion plays a major role in the lateral transport of pollutants, and the value of transverse dispersion is more important. The research results have important reference significance for groundwater environmental protection and groundwater pollution prevention and control in the vicinity of Quan Group. According to the predicted results of numerical simulation, different monitoring points are set up in the project area, and the model is identified and verified according to the change of pollutant concentration at the monitoring point. The verification results show that the model has high accuracy. The model has a high guiding significance for prediction. The change trend of pollutant transport in groundwater in the next 20 years is predicted by using the established conceptual model. The predicted results show that in the next 20 years, pollutants will continue to migrate to Baotu Spring, and the concentration of pollutants will continue to increase, but when a critical value is reached, it will tend to be balanced, and the critical value is within the allowable range. Pollutants will also cause some pollution to the surrounding groundwater. The diffusion rate of pollutants has a certain relationship with the exploitation speed of the groundwater in the surrounding area. If the exploitation of groundwater increases, the diffusion of pollutants will be accelerated.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X523

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