Lack of appropriate technology, difficulty of measuring bed load and unclear boundary between bed load and suspended load induce experts to determine a part of suspended load as bed load. This ratio in many rivers with different conditions has the same coefficient and sometimes in a river, different experts estimate various ratios. In this study, two reach of Taleghan and Jajroud rivers was selected to determine the ratio, while stream flow was simulated by HEC-RAS software in both reaches. Bed load was calculated by Meyer-PeterMuller, Casey, Schoklitch and Van Rijn equations, and Einstein, Chang-Simons-Richardsin, Begnold and Toffalati equations were used to estimate suspended load. After validation of equations, results showed that in both rivers, Schoklitch equation provides the best estimation for bed load. For suspended load, the Einstein and the Bagnold equations provided the best estimation for Jajroud and Taleghan rivers, respectively. R and Re tests and selecting of best equations for estimation of bed and suspended loads showed that bed load to suspended load ratio was about 3.76 and 0.14 in Jajroud and Taleghan rivers, respectively.
کلید واژگان :Bed load, HEC-RAS, Jajroud River, Suspended load, Taleghan River.
ارزش ریالی : 300000 ریال
با پرداخت الکترونیک