【作者】 蒋任飞；

【导师】 白丹；

【作者基本信息】 西安理工大学 ， 环境工程， 2004， 硕士

【摘要】 本文在对宁夏石嘴山市的水文地质和地下水资源及污染进行系统分析的基础上，建立了石嘴山市地下水水质模型。并采用有限差分法，利用Processing Modflow软件对石嘴山市浅层地下水中污染物的运动进行数值模拟研究。研究成果为预测中水长期灌溉绿化带对地下水质的影响提供了依据。这对缓解城市水资源短缺矛盾，保护地下水水源，改善生态环境具有重要意义。研究成果如下： (1)将研究区单一潜水和“双层结构”区统一概化成潜水层。并针对研究区水文地质结构复杂的情况，将研究区划分为五个计算亚区。在参考以前研究的基础上，分别计算出各亚区水文地质参数初值并确定边界条件。 (2)建立了石嘴山市地下水水流模型，代入参数初值，利用1992年～1995年地下水位观测值对水流模型进行识别，通过多次调试，反求出反映水文地质参数的渗透系数K和给水度μ。并利用1996年～1999年地下水位观测值对水流模型进行了验证。 (3)建立了石嘴山市地下水水质模型，以氯离子作为模拟离子，利用PMWIN软件中的MT3D对水质模型进行模拟计算，反求出弥散度。通过与实测资料的拟合，对模型进行了校正。 通过对水流模型和水质模型的拟合和检验结果表明，计算值与实测值吻合较好，模型的概化符合实际，各亚区有关参数的取值是合理的。更多还原

【Abstract】 On the basis of systematical analysis of the conditions of hydrogeology and groundwater pollution and resources in Shizuishan city, Ningxia province, the groundwater quality models were proposed in this paper. The finite difference method was applied to simulate the movement of contaminant in the shallow ground water in Shizuishan city by means of the Processing Modflow software. The research results provided the base for predicting the effect of irrigating the greenwood by using middle-water for a long time. It is of a great significance to protect groundwater resource areas and improve the bio-environ conditions. The main research results are summarized as following:1. The research area consisted of a single phreatic aquifer and "double-layer structure" aquifer was simplified as a phreatic aquifer, which was divided into five subregions owing to the complexities of hydrogeological structure of the research area. On the foundation of reference researches, the original values of hydrogeological parameter of each subregion were calculated respectively and the boundary conditions were identified.2. The groundwater flow model in Shizuishan city was presented in this paper. The groundwater flow model into which the initial values of hydrogeological parameters were inputted was calibrated according to the comparison between the calculated values and the observed values of groundwater hydraulic heads from 1992 to 1995, and through much trialing thehydrogeological parameters such as hydraulic conductivity and storage coefficient were calibrated. At last the groundwater flow model was tested by means of the observed data of groundwater level from 1996 to 1999.3. The mathematical model of contaminant transportation in groundwater was proposed in this paper. The chlorine ion was used as simulated ion, and using the MT3D package of PMWIN software to simulate the way of the contaminant movement in groundwater to get the diffusive degree. By comparison between the computed data and observed data this model was modified.The results of numerical simulation show that the calculated values are in good agreement with the observed data, the simplified assumptions are practical, and that some values of hydrogeological parameters in each subregion are rational.更多还原