Simulation of Water Table Fluctuations and Nitrate Concentration with DRAINMOD-N Model in Paddy Rice Field (Case Study: Capic)

Document Type : Research Paper

Authors

Abstract

In this study, simulations of water table fluctuations and nitrate concentration of groundwater were
investigated in paddy rice fields which were equipped with controlled drainage system. This research
was done in Haraz Technology and Development center in Mazandaran province north of Iran. For
simulating the qualitative and quantitative variations of groundwater surface in the drained area,
DRAINMOD-N model was applied using calibrated and measured data. It was necessary to calibrate
the mineralization, denitrification and dispersivity constants in acceptable range to achieve the best
fitness between the measured and simulated data. Therefore, the above constants were obtained
0.000035, 0.4 and 5 respectively. The analysis was done in graphical and statistical modes between
the measured and simulated data. The statistical comparison was done by the mean bias error
(MBE), model efficiency (EF) and correlation factor (r) indices. indices were achieved 3.38, 0.53,
and 0.80 for estimation of the ground water level and 0.61, 0.97, and 0.99 for the estimation of
nitrate concentration, respectively. The DRAINMOD-N model maybe used as a powerful model in
simulation and management of water pollution in drained area for reducing the environmental risks
which may be occurred in paddy rice fields.

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Main Subjects


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