Determining the Coefficients of Philip's Equation and the Optimal Roughness Coefficient Using the Simulation of the Advancing Phase in Border Irrigation with the Dynamic Wave Model
Surface irrigation is one of the most common irrigation methods. Due to the low efficiency of surface irrigation, water loss is significant in this system. It is necessary to know the characteristics and coefficients of water infiltration rate in the soil for accurate and adequate planning of surface irrigation. One of the equations used in this field is Phillip's infiltration equation. In this study, the infiltration coefficients of Phillip's equation and Manning's roughness coefficient in border irrigation are determined based on the comparison of the actual advance curve with the advance curve calculated with the dynamic wave model, and the results were compared with the double cylinder method and the two-point method of Ebrahimian et al. (5). The actual infiltration volume was obtained from the difference between the inlet and outlet volumes. The error of the mentioned method in calculating the infiltration volume was 5.53%. Meanwhile, the errors in the double cylinder and two-point Ebrahimian (5) method were 59.62% and 19.08%, respectively. In heavy soils, the longer the length of the border increases, the method is more accurate in estimating Philip's coefficients, while in light soils, the advancing time, which in addition to length is a function of permeability, input discharge, and the slope of the bottom of the bed is increased, the accuracy of the method in estimating Philip's penetration coefficients is increased.
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Flood Routing in Rivers Using Two-Dimensional HEC-RAS Software and its Comparison with the Non-Linear Muskingum Method
M. Amiri, E. Fazel Najafabadi, M. Shayannejad*
Journal of Hydrology and Soil Science, -
Estimation of soil moisture using remote sensing and its evaluation with field data (Case study of Hormoz Abad Plain)
M. Tajsaeid, M. Gheysari, E. Fazel Najafabadi*, R. Jafari, E. Seyfipurnaghneh
Journal of Hydrology and Soil Science, -
Yield and Water Productivity of Wheat under Drip-Tape and Surface Irrigation System in East of Isfahan
S. Aghaei*, M. Gheysari, M. Shayannejad
Journal of Hydrology and Soil Science,