【作者】 马文超；

【导师】 姚磊华；

【作者基本信息】 中国地质大学（北京） ， 地下水科学与工程， 2010， 硕士

【摘要】 本论文以乌梁素海湖泊为典型代表,对乌梁素海湖滨带的渗流及补给作用,以及湖岸带反硝化作用进行研究。通过土槽模拟含水层渗流实验的观测数据,表明在湖泊补给地下含水层时,湖泊与含水层从交界处向含水层方向的水流运动特征。通过土槽模拟含水层淋滤实验的观测数据,来表明在湖泊补给地下含水层时,湖泊与含水层交界带位置向含水层方向的水质运移特征。利用水槽试验和数学模拟的方法验证了湖滨带湖水补排潜水时,地下水渗流速度在指定岸坡倾角下,潜水和湖水界面上的分布规律。基于MODFLOW和湖滨带土壤剖面反硝化速率概念模型,测定了湖滨带潜水层中反硝化速率。建立了湖岸带反硝化渗流与渗流实验的数学求解模型,并结合模型所模拟的边界,及岩层性质等因素,采用Visual modflow 4.0进行模拟,经过对模型的校正,模拟结果能够很好的再现实验结果,并预测了60天内,含水层中地下水的溶质分布。通过模型的计算值,得到了溶质浓度稳定后的观测点位反硝化的硝酸根浓度。采用BaPS测定反硝化系统,测定了当含水层中输入硝酸根浓度时间的不同,含水层中的反硝化速率值。揭示了在受到硝酸根影响时间不同的情况下,含水层中反硝化作用的发生时间与强度。而后,结合上述水位与水质的实测值与计算值,与溶质输入含水层稳定后的,反硝化速率与含水层的水位值、硝酸根含量关系进行分析,发现硝酸氮的含量与含水层水位都影响了反硝化作用的发生速率。因此通过上述研究内容初步揭示了,由于湖泊补给地下水,含水层中所产生的水流运移、溶质分布以及硝酸根与以上因子共同作用对反硝化作用所产生的影响。更多还原

【Abstract】 This thesis is represented Wuliangsuhai lake, to investigate the seepage way, recharge function and the dentrification of the lakeshore. Soil tank had been designed and been taken to reproduction the lakeshore circumstances. The reappeared groundwater flow showed the transport way and features of the junction between the lake and the underground , the reappeared circumstances indicated the movement of the water quality.The combination of using the soil tank test and the mathematics simulation had been testified during the lake recharge the aquifer, the seepage velocity showed the regularly way in the junction zone. The velocity of the dentrification of the lakeshore had been calculated by using the Visual Modflow 4.0.When the simulation is taking place, it is necessary to build the differential equation to describe the dentrification and seepage test where the initial condition and the formation also have been under the consideration. After build the Visual Modflow 4.0, the step of correction had been taken place,the result of simulation showed in well matched . It showed the 60 days flow and concentration distributing situation by using software.The velocity of the dentrification were measured by the BaPS instrument, the result showed the velocity was different when the concentration of the nitrate were different. Both the measured and simulated hydraulic head and water quality of the stable aquifer, that affect the happening of the dentrification.Therefore, through the research aboved, the regular pattern of the affection to the dentrification both by the water movement , the quality distribution and concentration of the nitrate, have been revealed preliminary.更多还原