论文部分内容阅读
利用3种不同水流运移方程分别模拟井管附近不同区域的水流运动,基于流量守恒原理实现不同流态区域边界的耦合,建立了有代表性的观测井-含水层系统场景;利用建立的耦合模型模拟了观测井-含水层系统中水头的分布,基于模型模拟数据分析了观测井井筒存在对含水层局部水头分布及地下水水质采样和环境监测结果的影响;还分析了地下水三维水流强度、观测井井径以及含水层介质参数等对井筒效应的影响规律:井筒效应在粘土等渗透系数和比单位贮水系数相对较小的含水层介质中更为明显,其影响随着三维水流强度及观测井井径的增加而增大;进行了上述参数的敏感性分析,指出对于同一参数其在不同区间的敏感性比例不同,对于不同参数观测井井径的敏感性比例最大,因此在地下水环境监测的工程实践中减小观测井井径是相对快速且有效提高监测和采样精度的方法.
Three kinds of different water flow equations are used to simulate water flow in different areas around the well pipe respectively. Based on the principle of flow conservation, the coupling of different flow regime boundaries is established, and a representative observation well-aquifer system scenario is established. By using the established coupling The model simulates the head distribution in the observation well-aquifer system. Based on the model simulation data, it analyzes the influence of wellbore presence in the aquifer on local head distribution and groundwater quality sampling and environmental monitoring results. The three-dimensional groundwater flow intensity, Well diameter and aquifer parameters on the wellbore effect law: wellbore effect in the clay and other permeability coefficient than the unit water storage coefficient is relatively small aquifer medium is more obvious, the impact of the three-dimensional flow intensity and observation The sensitivity of the above parameters is analyzed, and the sensitivity of the same parameters to different sections is different, and the sensitivity to the borehole diameter of observation wells with different parameters is the largest. Therefore, in the monitoring of groundwater environment Reducing the well diameter of observation wells in engineering practice is relatively quick and effective in monitoring and sampling Methods degrees.