Two-Dimensional Total Sediment Load Model Equations |
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Authors: | Blair Greimann Yong Lai Jianchun Huang |
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Affiliation: | 1Hydraulic Engineer, U.S. Bureau of Reclamation, Denver Federal Center, Bldg. 67, P.O. Box 25007 (86-68540), Denver, CO 80225-0007. E-mail: bgreimann@do.usbr.gov 2Hydraulic Engineer, U.S. Bureau of Reclamation, Denver Federal Center, Bldg. 67, P.O. Box 25007 (86-68540), Denver, CO 80225-0007. 3Research Engineer, Civil and Environmental Engineering, Colorado State Univ., Fort Collins, CO, 80523-1372.
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Abstract: | An unsteady total load equation is derived for use in depth-averaged sediment transport models. The equation does not require the load to be segregated a priori into bed and suspended but rather automatically switches to suspended load, bed load, or mixed load depending on a transport mode parameter consisting of local flow hydraulics. Further, the sediment transport velocity, developed from available data, is explicitly tracked, and makes the equation suitable for unsteady events of sediment movement. The equation can be applied to multiple size fractions and ensures smooth transition of sediment variables between bed load and suspended load for each size fraction. The new contributions of the current work are the consistent treatment of sediment concentration in the model equation and the empirical definition of parameters that ensure smooth transitions of sediment variables between suspended load and bed load. |
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Keywords: | Two-dimensional models Sediment transport Parameters Bed load |
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