S264 : Selection the most appropriate method to estimate suspended load and bed load of Bydvaz Esfarayn River
Thesis > Central Library of Shahrood University > Agricultural Engineering > MSc > 2015
Authors:
Abstarct: The amount of sediment in rivers is the one of the most important problems in river engineering. Sediment transport phenomenon is the complexity of the development of several methods.
Methods In this study the most suitable criteria to estimate suspended load, bed load and total load sediment in river Bidvaz is selected. For this purpose, the amount of suspended sediment and bed load Bidvaz river gauging station in Ghaleh Sefid was measured at the time of flooding. For the measurement of suspended sediment sampling bottles for sampling and bed load sampler was used Helly-Smith. Then, Profile, hydraulic and river engineering Bidvaz measured and calculated. The samples were sent to the laboratory of soil mechanics and calculate and graph gradation curves and the concentration of suspended solids was determined. Water District of enterprise software to calculate the observed values of suspended sediment, bed and total load sediment was used. There are three methods for calculation of suspended sediment load (methods Lane & Kalinske’s, Einstein and Chang, Simons & Richardson’s) and four bed load calculation methods (methods Shields, Meyer-Peter, Schoklitsch and Casey) and seven valid method for calculate the total load (methods Engelund & Hansen, Ackers & White, Colby1957, Doboys, Einstein-Brown, Meyer-Peter and Modified Einstein) was used. To evaluate and compare the two methods were used RMSE and absolute percentage error relative.
Comparing the values and observed the following results were obtained:
1. Chang method with RMSE = 27.23 and 10 percent relative error is proposed to calculate the suspended load.
2. Shalkych method with RMSE = 412.16 and 10 percent relative error is proposed to calculate the bed load.
3. Colby 1957 method with RMSE = 191.62 and 10 percent relative error is proposed to calculate the total sediment load. England relation to the calculation of the Total Load offers good results.
Keywords:
#Sediment transport #bed load #suspended load #the load of sediment #river Bidvaz #Helly-Smith Link
Keeping place: Central Library of Shahrood University
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Keeping place: Central Library of Shahrood University
Visitor: