نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی سابق کارشناسیارشد گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز
2 استادیار گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز
3 استادیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه کردستان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Saturated hydraulic conductivity (Ks) and drainable porosity () are two important parameters for designing subsurface drainage systems under unsteady-state flow conditions. In this study, an inverse method was developed to estimate the optimal values of Ks and. In the proposed inverse method, a genetic algorithm was used as an optimization technique. The drainage equation used in this research was Glover-Dumm equation. In order to measure the data required for calibration and evaluation of the developed inverse method, a sand box was designed and constructed in the laboratory. Also, the values of Ks and were measured directly. The water table height between the two subsurface drains was simulated by using the values of Ks and obtained from inverse method and direct method. The comparison of water table profiles indicated that predicting the water table profile using the values of Ks and obtained from inverse method was more accurate. In addition, the value of RMSE index decreased significantly using inverse method. Thus, this method was more exact. Therefore, it appears that the inverse method presented in this study is a highly efficient approach for estimating the values of Ks and.
کلیدواژهها [English]