Sediment inception under breaking tidal bores |
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| Affiliation: | 1. Department of Petroleum Engineering and Applied Geophysics, Norwegian University of Science and Technology, Trondheim, Norway;2. Department of Geology and Mineral Resources Engineering, Norwegian University of Science and Technology, Trondheim, Norway;3. MultiClient Geophysical, Stasjonsveien 18, 1396 Billingstad, Norway;1. Department of Mathematics, University of Oslo, Norway;2. Department of Physics, University of Oslo, Norway;3. Department of Geosciences, University of Oslo, Norway;1. Department of Mathematics, University of Oslo, N-0316 Oslo, Norway;2. Statoil ASA, Research Center Porsgrunn, NO-3908 Porsgrunn, Norway |
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| Abstract: | A tidal bore may develop in an estuary during the spring tide conditions when the tidal range exceeds 5–6 m and the flood tide is confined to a narrow funnelled estuary with low freshwater levels. The tidal bore is of great importance for the geomorphology of the estuarine zone. In this study, some physical modelling was performed to investigate the sediment motion inception beneath a tidal bore on a movable gravel bed. The results show the significant impact of breaking bore propagation on the gravel bed motion. The dominant contribution to sediment transport inception is the longitudinal pressure gradient force, while the transient recirculation motion next to the bed yields to a drag force acting in the upstream direction and contributing to sediment motion. |
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