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Discussion papers | Copyright
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 23 May 2018

Research article | 23 May 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Hydrology and Earth System Sciences (HESS).

A novel model for simulation of nitrate in aquifers

Roohollah Noori1, Mehrnaz Dodangeh1, Ronny Berndtsson2, Farhad Hooshyaripor3, Jan Franklin Adamowski4, Saman Javadi5, and Akbar Baghvand1 Roohollah Noori et al.
  • 1Department of Environmental Engineering, Graduate Faculty of Environment, University of Tehran, Tehran, 1417853111, Iran
  • 2Department of Water Resources Engineering & Center for Middle Eastern Studies, Lund University, Box 118, SE-221 00 Lund, Sweden
  • 3Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, 1477893855, Iran
  • 4Department of Bioresource Engineering, Faculty of Agricultural and Environmental Sciences, McGill University, Montreal, H9X 3V9, Canada
  • 5Department of Irrigation and Drainage, Aburaihan Campus, University of Tehran, Tehran, 3391653755, Iran

Abstract. Please Numerical groundwater quality models (GQMs) often run at high computational cost resulting in long simulation times and complex parameter calibration that limit their practical applications. In this study, a novel reduced-order model (ROM) was developed for nitrate simulation in groundwater including a simple structure and with similar accuracy as more extensive GQMs. The proposed methodology for the development of ROM presents a solution for the problem in ROMs developed with eigenvectors, to make predictions into the future. The model performance was investigated by simulation of nitrate in the Karaj Aquifer, Iran. The dominant modes of spatiotemporal variation of nitrate during a five-year period was calculated by the model. The results revealed an excellent agreement between nitrate simulated by the ROM and the well-known Modular Transport 3D Multi Species (MT3DMS). The absolute error between the ROM and the MT3DMS was less than 0.5mg/l in the most parts of the aquifer. Thus, results confirm that the use of ROM has advantages through a much simpler structure and shorter calculation times. Observed spatiotemporal variation of nitrate in the aquifer was well represented by the ROM simulations. The simplicity of the model makes it highly interesting also to other water resources problems.

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