Modeling of multicomponent transport with microbial transformation in groundwater: The Fuhrberg Case
Modeling of multicomponent transport with microbial transformation in groundwater: The Fuhrberg Case
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地下水中微生物转化的多组分传输建模：Fuhrberg 案例
DOI：
10.1029/wr026i008p01707
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发表时间：
1990
影响因子：
5.4
通讯作者：
J. Boettcher
中科院分区：
文献类型：
--
作者：
E. Frind;W. H. M. Duynisveld;O. Strebel;J. Boettcher
本文服务于双重目的，展示了一种数值技术，似乎有潜力的非线性反应运输porcills的研究，并提出了一个案例研究的反应运输过程的影响是深刻的。案例研究涉及德国北方的Fuhrberger费尔德含水层，该含水层为拥有50万人口的汉诺威提供了大部分供水。部分含水层从农业活动中接受大量的硝酸盐流入。含水层中的硝酸盐通过微生物转化为硫酸盐，这种转化取决于沉积物中存在的还原硫化合物的可用性，硫酸盐也进一步转化。个别转换发生在含水层的不同反应区内。相关的动力学过程可以表述为一个非线性传输问题，涉及溶解或固体形式的多个相互作用的物种。该系统是使用有限元为基础的技术，产生一个对称系数矩阵的传输方程，同时提供二阶精度的时间模拟。矩阵的形式允许使用高效和鲁棒的对称共轭梯度求解器。该技术以合理的成本提供了足够的空间分辨率能力，并处理二维或三维的不规则几何图形。保留了传统有限元的方便性和通用性。一个垂直截面模拟识别不同的反应区的含水层，并提供洞察控制参数的效果。模拟研究是预测地下水资源命运的第一步。«少
This paper serves the twofold purpose of demonstrating a numerical technique that appears to have potential in studies of nonlinear reactive transport porblems and of presenting a case study where the implications of reactive transport processes are profound. The case study relates to the Fuhrberger Feld aquifer in northern Germany, which provides the bulk of the water supply for the half-million city of Hannover. Part of the aquifer receives a strong influx of nitrate from agricultural acitivites. The nitrate in the aquifer is microbially transformed into sulfate, the transformation depending on the availability of reduced sulfur compounds present in the sediment, and the sulfate is also transformed further. The individual transformations occur within distinct reaction zones in the aquifer. The relevant dynamic processes can be formulated as a nonlinear transport problem involving multiple interacting species in dissolved or solid form. The system is simulated using a finite element-based technique that generates a symmetric coefficient matrix for the transport equation, while providing second-order accuracy in time. The form of the matix allows the use of a highly efficient and robust symmetric conjugate gradient solver. The technique provides an ample spatial resolution capacity at reasonable cost and handles grids with irregular geometrymore » in two or three dimensions. The convenience and versatility of conventional finite elements is retained. A vertical-section simulation identifies different reaction zones in the aquifer and gives insight into the effect of the controlling parameters. The simulation study is a first step in the developemtn of a prognosis for the fate of the groundwater resource.« less