Evaluation of the Agro-Hydrological SWAP Model in Simulating Water Table Fluctuation and Subsurface Drainage Rate

Document Type : Research Paper

Authors

Abstract

In this study, evaluation of SWAP model in simulating water table fluctuations and subsurface
drainage rate was investigated at the wheat- grain maize cultivated unit in the Voshmgir irrigation
network, Golestan province. Water table levels and drainage rate data were monitored in the study
area at different times during the evaluation period. The statistical comparison based on the root
mean square error (RMSE) showed the values of 9.55 cm and 0.22 mm/day for the estimated
ground water depth and drainage flow rate, respectively. The simulated groundwater levels and
subsurface drainage rate agreed well with those measured values. The analysis of the estimated
bottom flux by the model and comparison of the measured and simulated water table depths showed
that there was a negligible water exchange between the shallow groundwater and the soil profile
beneath the impermeable layer. For analysis of managerial scenarios, no flow condition at the
bottom of the soil profile, and zero bottom flux can be applied as the bottom boundary conditions.
Therefore, the SWAP is a powerful model in estimating hydrological components of drainage
system and drain water management in irrigated areas.

Keywords

Main Subjects


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