%0 Journal Article %T Effect of slope on soil wetting pattern under surface drip irrigation and simulation HYDRUS-2D model %J Water and Irrigation Management %I University of Tehran, College of Aburaihan %Z 2251-6298 %A Heidari, Zeinab %A Farasati, Masoumeh %A Ghobadian, Rasool %D 2015 %\ 09/23/2015 %V 5 %N 2 %P 277-288 %! Effect of slope on soil wetting pattern under surface drip irrigation and simulation HYDRUS-2D model %K maximum wet depth %K maximum wet width %K moisture pattern %K sloping land %K Richards equation %R 10.22059/jwim.2015.57459 %X 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. %U https://jwim.ut.ac.ir/article_57459_c4ebad2e6a5fe50bca3423b94b913917.pdf