Abstract
This study presents an identification mehtod of infiltration and roughness parameters for border irrigation. At the begining of an identification procedure, infiltration and roughness parameters are estimated by simple algebraic equations with measurements of rate of advance and surface-water profile. Approximate estimates of the parameters are corrected by an iterative method with an exact solution of the hydrodynamic model. The method was applied to border irrigation tests. Each parameter converged to a certain value after 3 or 4 iterations. Once the parameters are evaluated, rate of advance, surface-water profile and infiltrated water profile ofborder irrigation can be predicted by the hydrodynamic model with various inlet flow rates. In practice, an average infiltrated water along the border has to be estimated by a simple method with reasonable accuracy. To multiply the infiltrated water at an upstream end by a shape factor is a practical method to estimate the average infiltrated water along the border. Equations to calculate the shape factor were assessed based on the infiltrated water profile by simulation. Some of the equations were proved to be able to estimate an accurate value of the shape factor.
