Relationship between bedload and suspended sediment in the sand-bed Exu River,in the semi-arid region of Brazil |
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Authors: | Jose Ramon B Cantalice Moacyr Cunha Filho Borko D Stosic Victor Casimiro Piscoya Sergio M S Guerra Vijay P Singh |
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Institution: | 1. Agronomy Engineering Department, Soil Conservation Engineering Laboratory, Rural Federal of Pernambuco University (UFRPE) Brazil, Recife-PE, Brazilcantalice21@hotmail.com;3. Informatics and Statistics Department, Rural Federal of Pernambuco University (UFRPE), Recife-PE, Brazil;4. Rural Technology Department, Rural Federal of Pernambuco University (UFRPE), Recife-PE, Brazil;5. Biological and Agricultural Engineering Department &6. Civil &7. Environmental Engineering Department, Texas A &8. M University, College Station, Texas, USA |
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Abstract: | AbstractSuspended sediment and bedload discharges in sand-bed rivers shape semi-arid landscapes and impact sediment delivery from these landscapes, but are still incompletely understood. Suspended sediment and bedload fluxes of the intermittent Exu River, Brazil, were sampled by direct measurements. The highest suspended sediment concentration observed was 4847.4 mg L-1 and this value was possibly associated with the entrainment of sediment that was deposited in the preceding year. The bedload flux was well related to the stream power and the river efficiently transported all available bedload with a mean rate of 0.0047 kg m-1 s-1, and the percentage of bedload to suspended sediment varied between 4 and 12.72. The bed sediment of Exu River was prone to entrainment and showed a proclivity for transport. Thus, sand-bed and gravel-bed rivers of arid environments seem to exhibit the same mobility in the absence of armour layer.Editor D. Koutsoyiannis; Associate editor B. TouaibiaCitation Cantalice, J.R.B., Cunha Filho, M., Stosic, B.D., Piscoya, V.C., Guerra, S.M.S., and Singh, V.P., 2013. Relationship between bedload and suspended sediment in the sand-bed Exu River, in the semi-arid region of Brazil. Hydrological Sciences Journal, 58 (8), 1789–1802. |
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Keywords: | sediment transport sand-bed rivers stream power semi-arid variability sediment delivery |
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