Journal of Environmental Hydrology
Journal of Environmental Hydrology
ISSN 1058-3912
Quarterly electronic journal of the International Association for
Environmental Hydrology
On the World Wide Web at http://www.hydroweb.com
JEH VOLUME 4 (1996)
SEDIMENT TRANSPORT AT VERY HIGH CONCENTRATIONS AND ITS MOVEMENT BEHAVIOR
Aiwen Ying
Water Information Center
Ministry of Water Resources
Beijing, China
In the Yellow River, the annual average sediment discharge and the
annual average sediment concentration are the highest in the world. The
measured maximum concentration approaches 1600 kg/m3 in its
tributary. The mechanisms of sediment movement are much different between
very high concentrations and the general concentration. For the case of
hyperconcentration, the decisive condition for the suspension of sediment
particles is the Bingham ultimate shear stress (for Model I), or the intergranular
dispersive stress (for Model II), but it is no longer the vertical turbulent
intensity of the flow. The theoretical equations of vertical suspended
sediment concentration such as the Rouse equation derived from low sediment
concentrations are no longer applicable.
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