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Turbulence,suspension and downstream fining over a sand-gravel mixture bed

International Journal of Sediment Research 2013年第2期28卷 194-209页

作者： K.GHOSHAL rahul mazumder C.CHAKRABORTY B.S.mazumder Department of Mathematics Indian Institute of TechnologyKharagpur 721302India Assist.Prof. MIT CambridgeUSA Post-Doctoral Assoc. Fluvial Mechanics Laboratory Physics and Earth Science DivisionIndian Statistical InstituteKolkata 700108India Prof.

Flume experiments were carried out to study the turbulence and its impact on suspension and segregation of grainsizes under unidirectional flow conditions over the sand-gravel mixture *** components of fluid velocity with fluctuations were measured vertically using 3-D Micro-acoustic Doppler velocimeter(ADV).The theoretical models for velocity and sediment suspension have been developed based on the concept of mixing length that includes the damping effect of turbulence due to sediment suspension in the flow over the sand-gravel mixture *** analysis of segregation of grain-sizes along downstream of the bed has been performed using the principle of unsupervised learning or clustering *** data analysis suggests that there is a progressive downstream fining of sediment sizes with selective depositions of gravels,sand-gravels and sand materials along the stream,which may be segmented into three regions such as,the upstream,the transitional and the downstream *** contribution is relevant to understand the direction of ancient rivers,the bed material character in the river form,sorting process and its role in controlling the sediment flux through landscape.

关键词： Sand-gravel mixture Flow velocity ADV Suspension concentration Size-sorting Clustering

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