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Abstract of the Article

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Bed Load Transport under Unsteady Flow Conditions

Authors:
[ Esmaieli ] - PhD Student, Water Sciences Engineering Faculty
[ Shafaie Bajestan ] - Professor, Water Sciences Engineering Faculty
[ Kashefipour ] - Assistant Professor, Water Sciences Engineering Faculty

Abstract:

In this research study the sediment transport under unsteady flow conditions has been investigated using a series of experiments carried out in a tilted laboratory flume. A reservoir was installed at the upstream of the flume for generating different unsteady hydrographs. Fine sand with uniform size distribution and an average size of 1.5mm was used with three different discharges and three different base flow times. The results show that for the same discharge, sediment load was increased with decreasing base flow time. Sediment load was found to be a function of the primary wave conditions and its amount is more than what is generally occurred for steady conditions. For hydrographs with long base flow time, sediment transport under unsteady conditions would be almost the same as for the steady conditions.

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