Calculating the flux at the bottom boundary of the root zone under shallow groundwater table based on SWAP model

Soil-Water-Atmosphere-Plant Model is calibrated and validated the water transfer parameters by comparing the simulation results with the observed values. The model is used to simulate the upward flux at the bottom boundary of root zone in the Otindag sandy area in 2005-2006, analyze variation of the precipitation, buried depth of groundwater table, flux, and crop evapotranspiration. The main results of the papers are as follows: Root zone is mainly supplied by groundwater in low-flow year (2005), groundwater is supplied in wet year (2006).