Effect of slope on soil wetting pattern under surface drip irrigation and simulation HYDRUS-2D model

Document Type : Research Paper


1 M.Sc. Student of Irrigation and Drainage, Agricultural Faculty, Razi University, Kermanshah, Iran

2 Assistant Professor, Agricultural Faculty, Razi University, Kermanshah, Iran & Assistant Professor, Agricultural Faculty, Gonbad-e Kavoos University, Gonbad, Iran

3 Associate Professor, Agricultural Faculty, Razi University, Kermanshah, Iran


In this study, effect of slope on soil wetting pattern under surface drip irrigation and simulation with HYDRUS-2D model evaluated.The physical model made of Plexiglas to size 83, 6 and 54 cm (length, width, height) filled with silty clay loam soil was used. To achieve the desired discharge, a small drip irrigation system created that includes a water tank with a fixed height (about 2 meters), a emitters regulated manually, and pipe transferring the water to emitters. Discharge was 4 L/hr and the slopes of selective were 0, 5, 15 and 25 percent. Irrigation time for each test was fixed and 2 hours. Readings of wet pattern was performed until 24 hours after irrigation and fixed wetting pattern. HYDRUS-2D model was Simulation selection model. To determine soil hydraulic parameters Rosetta model used. For The maximum wet depth and maximum wet width obtained RMSE value between 1.44-3.4% that shows the error is low. The results showed that HYDRUS-2D model have high ability to simulate the wetting pattern flat and slope lands.


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