MODELING TRANSPORT OF NITRATE IN SHAHROOD AQUIFER

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JAFARI HADI; VALIZADEH MOHADESSEH

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Journal: GEOCHEMISTRY Year:2014 | Volume:3 | Issue:1 Page(s): 393-402

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Title

MODELING TRANSPORT OF NITRATE IN SHAHROOD AQUIFER

Author(s)

JAFARI HADI | VALIZADEH MOHADESSEH | Issue Writer Certificate

Keywords

MODELINGQ2

MT3DMSQ2

NITRATEQ2

SHAHROODQ2

Abstract

Shahrood aquifer in Semnan province is affected by NITRATE pollution sources such as domestic wells, agricultural return flow and industrial activities. These factors caused an increase of about 5.5 to 140 mg/L in groundwater NITRATE concentration. In this research the transport and fate of NITRATE in SHAHROOD aquifer was studied. Groundwater flow was firstly was simulated using MODFLOW code and the model was calibrated under steady and unsteady states and was verified for a period of 3-years. Then transport of NITRATE was simulated by MT3DMS code. Initial and boundary conditions and transport mechanisms (advection, dispersion, diffusion and chemical reactions) of NITRATE were considered and the model was calibrated based on the concentration changes in urban area during a period of 2-years. The results show that NITRATE transport in SHAHROOD aquifer is greatly affected by groundwater flow direction and hydraulic conductivity. A zone of low hydraulic conductivity in the west and depression cones due to pumping wells concentration in the south of urban area, prevent NITRATE spreading to the aquifer downstream. Denitrification process which decreases the NITRATE concentration is probably not involved, because the urban area is located near the aquifer recharge zone where the oxidation conditions are prevailed. Based on the MODELING results, NITRATE concentration in urban waste waters recharging SHAHROOD aquifer varies from 70 to 450 mg/L. The risk zone of NITRATE contamination in urban area was also investigated. NITRATE concentration in return flow from agricultural areas was calibrated at about 200 mg/L. Regarding volume of the return flows, about 152 kg NITRATE is annually leached from SHAHROOD agricultural areas. In general, wastewaters recharge from SHAHROOD urban areas have the highest impact on the NITRATE contamination of the groundwater resources.

Cites

SENSITIVITY ANALYSIS OF DRASTIC MODEL IN VULNERABILITY ASSESSMENT OF SHAHROOD ALLUVIAL AQUIFER

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APA: Copy

JAFARI, HADI, & VALIZADEH, MOHADESSEH. (2014). MODELING TRANSPORT OF NITRATE IN SHAHROOD AQUIFER. GEOCHEMISTRY, 3(1), 393-402. SID. https://sid.ir/paper/230850/en

Vancouver: Copy

JAFARI HADI, VALIZADEH MOHADESSEH. MODELING TRANSPORT OF NITRATE IN SHAHROOD AQUIFER. GEOCHEMISTRY[Internet]. 2014;3(1):393-402. Available from: https://sid.ir/paper/230850/en

IEEE: Copy

HADI JAFARI, and MOHADESSEH VALIZADEH, “MODELING TRANSPORT OF NITRATE IN SHAHROOD AQUIFER,” GEOCHEMISTRY, vol. 3, no. 1, pp. 393–402, 2014, [Online]. Available: https://sid.ir/paper/230850/en

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