Assessment of bed load transport formula by using developed applied software (STE) (Case study: Chehel-chai,Khormaloo and Soosara rivers in Golestan province)

Document Type : Research Article


1 MSc Student/Water Engineering, Gorgan University of Agricultural Sciences and Natural Resources

2 Water Engineering, Gorgan University of Agricultural Sciences and Natural Resources


Accurate estimation of flow and sediment discharges, as basic information, is important for many river engineering projects. To estimate bed load in the rivers, many experimental and semi-experimental equations have been developed but depending on the hydraulic conditions and sediment characteristics in each river, some of these equations may yield better results than the others. In this study, by developing an applied software, the abilities of 27 available equations for estimating bed load transport in rivers of Golestan province (Chehel-Chay, Khormaloo and Soosra), in which bed load is measured, have been evaluated. It should be noted that in this developed software quasi-two[1]dimensional models also can be used for computing velocity and sediment load distribution in cross section of the river. The software is also able to increase the accuracy of estimations by calculating calibration coefficients in the studied river. The results showed that by using the developed software, the best method for estimating bed load in the studied rivers is Yang’s method. In this case, the percentage of discrepancy ratio between 0.5 to 2 for the rivers Chehel-Chay, Khormaloo and Soosra is 43.8%, 50% and 30.8% respectively. Also, using quasi-two-dimensional models, increases percentage of discrepancy ratio between 0.5 to 2 for the rivers Chehel-Chay, Khormaloo and Soosra by 6.3%, 6% and 8%, respectively. The results also showed that by calculating and applying a calibration coefficient, accuracy of methods can be improved for the studied rivers.


Main Subjects

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