IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 5 - FLUVIAL HYDRAULICS AND RIVER MANAGEMENT : Why Cannot Sediment Transport Be Accurately Predicted
Why Cannot Sediment Transport Be Accurately Predicted
Author : Shu-Qing Yang
Sediment transport is a geophysical phenomenon that sediment particles are driven to move in streamwise and vertical directions by the corresponding forces. Almost all existing formulae of sediment transport were derived based on the assumption that sediment transport can be fully expressed by streamwise parameters like velocity or boundary shear stress etc., whilst the vertical parameters are not included, like the variation of water depth (pressure) over time and space, vertical velocity or seepage. This paper investigates the effect of vertical motion on sediment transport, it was found that the vertical motion can be well represented by a vertical velocity and the upward velocity increases particles? mobility, and the downward motion increases its stability. Decelerating flows can promote the upward flow and vice versa, this is why severe erosion always occurs in decelerating flows. New equations were developed to express the influence of vertical motion on sediment transport, in which streamwise and vertical parameters are included. A reasonably good agreement between the measured and predicted sediment transport was achieved.
File Size : 564,197 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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