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Shallow sediment transport flow computation using time-varying sediment adaptation length
Pu, Jaan H. Shao, Songdong Huang, Y.
Pu, Jaan H.
Shao, Songdong
Huang, Y.
Publication Date
2014-07
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© 2014 International Research and Training Centre on Erosion and
Sedimentation and the World Association for Sedimentation and Erosion Research. Reproduced in
accordance with the publisher's self-archiving policy. This manuscript version is made available
under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
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openAccess
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Abstract
Based on the common approach, the adaptation length in sediment transport is normally estimated in the temporal
independence. However, this approach might not be theoretically justified as the process of reaching of the sediment
transport equilibrium stage is affected by the flow conditions in time, especially for those fast sediment moving flows,
such as scour-hole developing flow. In this study, the 2D shallow water formulation together with a sediment
continuity-concentration (SCC) model were applied to flow with mobile sediment boundary. A time-varying approach
was proposed to determine the sediment transport adaptation length to treat the flow sediment erosion-deposition rate.
The proposed computational model was based on the Finite Volume (FV) method. The Monotone Upwind Scheme of
Conservative Laws (MUSCL)-Hancock scheme was used with the Harten Lax van Leer-contact (HLLC) approximate
Riemann solver to discretize the FV model. In the flow applications of this paper, a highly discontinuous dam-break
fast sediment transport flow was used to calibrate the proposed time-varying sediment adaptation length model. Then
the calibrated model was further applied to two separate experimental sediment transport flow applications
documented in literature, i.e. a highly concentrated sediment transport flow in a wide alluvial channel and a sediment
aggradation flow. Good agreements with the experimental data were presented by the proposed model simulations. The
tests prove that the proposed model, which was calibrated by the discontinuous dam-break bed scouring flow, also
performed well to represent the rapid bed change and the steady sediment mobility conditions.
Version
Accepted manuscript
Citation
Pu JH, Shao S and Huang Y (2014) Shallow sediment transport flow computation using
time-varying sediment adaptation length. International Journal of Sediment Research. 29(2): 171-
183.
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Article