Assessment of nitrate contamination in unsaturated zone of urban areas: The case study of Tehran, Iran
Assessment of nitrate contamination in unsaturated zone of urban areas: The case study of Tehran, Iran
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DOI：
10.1007/s00254-008-1464-0
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发表时间：
2009-06-01
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影响因子：
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通讯作者：
Ataie-Ashtiani, Behzad
中科院分区：
文献类型：
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作者：
Joekar-Niasar, Vahid;Ataie-Ashtiani, Behzad
模拟氮在非饱和带和饱和带中的去向是一个复杂的过程，需要详细的地球化学数据。过程的复杂性和数据的不一致性是两个主要问题，这使得问题的定量评估更加复杂。在这项工作中，提出了一个集总参数模型（LPM），已被评估为一个数据有限的情况下，研究非饱和带中的硝酸盐和铵的时间和稳态行为。模型中各组分的浓度取为水深平均浓度，忽略了扩散通量。案例研究区域是德黑兰市含水层，该含水层被排入地下水的生活废水高度污染。氮污染的三个来源已被研究，即生活污水，公园/娱乐应用，和湿沉降。结果表明，在最初几米（< 5 m）的硝酸盐产量相当大。为了将模型计算结果与实测结果进行比较，利用Vornoi图进行了误差估计分析。最后，仿真结果与实测结果有较好的相关性，验证了LPM方法的有效性。
Modeling fate of nitrogen in unsaturated and saturated zone is a complex process, which requires detailed geochemical data. Complexities of the process as well as data insufficiencies are two major issues, which make quantitative assessment of the problem more complicated. In this work, a lumped-parameter model (LPM) is proposed that has been evaluated for a data-limited case to study temporal and steady-state behavior of Nitrate and Ammonium in unsaturated zone. The concentration of components in the model are assumed as the depth-averaged concentrations, and dispersive fluxes have been neglected. The case study area is Tehran City aquifer, which is highly contaminated by domestic wastewater discharge into the groundwater. Three sources for Nitrogen contamination have been studied, namely domestic wastewater, park/recreational applications, and wet deposition. Results show that Nitrate production in the first few meters (< 5 m) is quite large. To compare the model results with the measurements, error estimation analysis based on Vornoi map has been fulfilled. Finally, it is shown that there is a fairly good correlation coefficient between simulation and measurements, which approves the validity of the LPM.