Author(s): Xiaonan Tang; Donald W. Knight
Linked Author(s): Xiaonan Tang, Donald W. Knight
Keywords: Overbank flow; Compound channel; Sediment transport; Flowresistance
Abstract: Experimental results are presented concerning stage-discharge relationships, resistance and sediment transport rates for compound channels with a mobile main channel bed and rigid smooth or roughened floodplains. The variation of resistance with depth, the effect of bed forms, and the abrupt reduction in resistance at the bankfull stage, are all linked to the stage-discharge relationships. The sediment transport rates Gs (g/s) are shown to gradually increase with increasing flow rate, but the concentration X (ppm) only increases up to the bankfull stage, after which it gradually decreases as the overbank flow increases. The effect of floodplain roughness on Gs is also described.
Year: 2001