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Paper Information

Journal:   GEOCHEMISTRY   SPRING 2014 , Volume 3 , Number 1; Page(s) 393 To 402.
 
Paper: 

MODELING TRANSPORT OF NITRATE IN SHAHROOD AQUIFER

 
 
Author(s):  JAFARI HADI, VALIZADEH MOHADESSEH*
 
* FACULTY OF EARTH SCIENCES, UNIVERSITY OF SHAHROOD, SHAHROOD, IRAN
 
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.

 
Keyword(s): MODELING, MT3DMS, NITRATE, SHAHROOD
 
 
References: 
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Click to Cite.
APA: Copy

JAFARI, H., & VALIZADEH, M. (2014). MODELING TRANSPORT OF NITRATE IN SHAHROOD AQUIFER. GEOCHEMISTRY, 3(1), 393-402. https://www.sid.ir/en/journal/ViewPaper.aspx?id=402913



Vancouver: Copy

JAFARI HADI, VALIZADEH MOHADESSEH. MODELING TRANSPORT OF NITRATE IN SHAHROOD AQUIFER. GEOCHEMISTRY. 2014 [cited 2021May12];3(1):393-402. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=402913



IEEE: Copy

JAFARI, H., VALIZADEH, M., 2014. MODELING TRANSPORT OF NITRATE IN SHAHROOD AQUIFER. GEOCHEMISTRY, [online] 3(1), pp.393-402. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=402913.



 
 
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