سنجش و گزينش مناسب ترين روش هاي برآورد باركف رودخانه ها (مطالعه موردي : رودخانه زرين گل -استان گلستان

Comparison and choosing the best methods of estimating rivers bed load(Case study: Zarringol river)

Study of the sediment movement in rivers to understand accurate hydraulic behavior and river morphology, is an important issue in river engineering Based on transport mechanism, bed material load is divided into suspended load and bed load. There are many empirical and semiempirical equations to estimate bed load now. But complication of sediument transport phenomenon arised from the reaction of hydraulic and sediument parameters caused that, these equations cannot predict sediment transport rate accurately. So the evaluation and choosing the best methods to estimate rivers bed load by comparison of cacluated and measured data are very important. In this article, sixteen equations are studied to estimate the bed load of Zarringol River in Golestan province. Then calculated and measured data by Helly-Smith sampler are compared and the results are analysed graphically. At the end, the best methods to calculate Zarringol river bed load discharge are proposed.