In this study, a numerical simulation is applied to investigate the effective factors on the seepage from the earthen channels. To authenticate the information at hand, some of the earthen channels in the Zayandeh-Rud irrigation network in Iran and Gediz watershed in Turkey were studied. 246 numerical models, including different sections of trapezoidal, rectangular and triangular earthen channels, were performed using the finite elements method (FEM). The results showed that, for a numerical simulation, a width of 15 times wider than the top width of the water surface in the channel would be required for the modelling of the left and right lateral boundaries. The comparison of the seepage with empirical relationships showed that the empirical relationships have too much error in the seepage estimation, however, Moritz’s relation with the coefficient of determination (R2) of 0.373 was better than the others. The linear and nonlinear multivariate regression relationships provide a suitable match for the seepage discharge estimation. The wetted perimeter has been distinguished as an effective parameter in the seepage from the channels, yet the channels side slope has a low impact on the seepage.

在这项研究中，数值模拟被用来调查影响土质通道渗流的有效因素。为了验证手头的信息，研究了伊朗Zayandeh-Rud灌溉网络和土耳其Gediz分水岭的一些土质渠道。使用有限元方法（FEM）进行了246个数值模型，包括梯形，矩形和三角形土质通道的不同截面。结果表明，对于数值模拟，建模左右两侧边界将需要比通道中水面顶部宽度宽15倍的宽度。渗流与经验关系的比较表明，经验关系在渗流估算中有太多误差，但是，Moritz与确定系数（R2）为0.373的关系要好于其他。线性和非线性多元回归关系为渗流估算提供了合适的匹配条件。润湿的周长已被认为是渠道渗流的有效参数，但渠道侧坡对渗流的影响很小。