| Aiming at the applicability of Hydrus-2D software for simulation of soil water movement in surge\|root irrigation (SRI) in the red soil region, according to the theory of unsaturated soil hydrodynamics and combining with the characteristics of soil water movement in SRI, the soil water infiltration model was established and solved using the Hydrus-2D software, and the simulated and measured values of the wet front migration distance and soil moisture content (SWC) were compared and verified. The results showed that at the end of irrigation, the relative error between the simulated measured values of the Hydrus-2D software for the vertically downward wet front was 5.21%, and the relative error between the simulated and the measured value of the horizontal wet front was -7.28%, and the correlation coefficients, R2, of the simulated and measured values of the wet front were all greater than 0.980, the RMSE’s were within 1.300 cm, and the P values of the F test were also greater than 0.05. At the end of the irrigation, the SWC at different distances from the emitter between the simulated values and measured values were basically the same, both of which showed that they increased first and then decreased as the depth of the soil layer increased. At different positions from the emitter, The relative errors between the simulated and measured values of SWC were within ±10%, and the correlation coefficients, R2, were all greater than 0.990, the RMSE’s were within 0.030 cm3·cm-3, and the P values of the F test were also greater than 0.05. The numerical simulation results could provide a theoretical basis for the rational design and operation of the SRI system in the red soil region. |