جستجوی مقالات مرتبط با کلیدواژه « chehelchay » در نشریات گروه « آب و خاک »

Determining the exact value of bed load is concerned with investigators. In this study the performance of 13 bed load sediment transport formula developed for use in steep gravel-bedded armored ChehelChay River, Iran is tested. The formulas are applied in the manner intended by the original authors. The results have been expressed in terms of a discrepancy ratio (r) defined as the ratio of the predicted and measured transport rate. The method of Ackers and White yields the best results for field data with 64% of the predicted transport rates in the range of 0.5≤ r ≤2. The Meyer-Peter and Mueller and Van Rijn equations yields approximately good results with 43%, and 36% of the predicted transport rates within a factor 2 of the measured values, respectively.