University of Tehran Press Iranian Journal of Soil and Water Research 2008-479X 50 3 2019 07 23 3D Numerical Modeling of Subsurface Flow through Rock Drains and Evaluation of Analytical Solutions 3D Numerical Modeling of Subsurface Flow through Rock Drains and Evaluation of Analytical Solutions 665 674 72012 10.22059/ijswr.2018.268304.668040 FA Eshagh Ansari PhD Student of Water Engineering Department, Faculty of Agricultural Engineering, Agricultural and Natural resources University of Sari, Sari, Iran Mohsen Masoudian Associate Professor of Water Engineering Department, Faculty of Agricultural Engineering, Agricultural and Natural resources University of Sari, Sari, Iran Mohammad Sedghiasl Associate Professor of Soil Science Department, College of Agricultur, Yasouj University, Yasouj, Iran 0000-0002-9159-251X Journal Article 2018 11 04 In this paper, subsurface flow profiles through coarse porous media have been simulated using a 3-D numerical model with and without surface discharge and their results have been compared with experimental data as well as with analytical solutions. SEEP/3D model, which is based on the finite element method, was used to simulate subsurface flow. The experimental model was consisted of coarse porous media with 6.4 m in length, 0.8 m in width and 1 m in height. The experiments were performed for different boundary conditions with two bed slopes of 4 and 20.3 %. The simulated data of watertableprofiles and seepage discharges were compared with those corresponding experimental data. In no recharge conditions with 4% slope, the numerical data were compared with both experimental and analytical dataindicating that the numerical results underestimated the watertable profilesas compared to the experimental ones. The results was better for the 20.3%-slope. In surface recharge condition, the numerical results only compared with analytical solution of Bear (1972), and the results indicated underestimation as compared to the experimental data. In this paper, subsurface flow profiles through coarse porous media have been simulated using a 3-D numerical model with and without surface discharge and their results have been compared with experimental data as well as with analytical solutions. SEEP/3D model, which is based on the finite element method, was used to simulate subsurface flow. The experimental model was consisted of coarse porous media with 6.4 m in length, 0.8 m in width and 1 m in height. The experiments were performed for different boundary conditions with two bed slopes of 4 and 20.3 %. The simulated data of watertableprofiles and seepage discharges were compared with those corresponding experimental data. In no recharge conditions with 4% slope, the numerical data were compared with both experimental and analytical dataindicating that the numerical results underestimated the watertable profilesas compared to the experimental ones. The results was better for the 20.3%-slope. In surface recharge condition, the numerical results only compared with analytical solution of Bear (1972), and the results indicated underestimation as compared to the experimental data. https://ijswr.ut.ac.ir/article_72012_468707b84b82703bd18e097ffdc27f12.pdf