| Title: | NUMERICAL MODELING OF SHIP-INDUCED CURRENTS IN CONFINED WATERWAYS |
| DOI No: | 10.1142/9789812701916_0019 |
| Source: | COASTAL ENGINEERING 2004 (pp 256-268)
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| Author(s): | OKEY G. NWOGU
Dept. of Naval Architecture and Marine Engineering, University of Michigan, Ann Arbor, MI 48109, USA
ZEKI DEMIRBILEK
Coastal and Hydraulics Laboratory, U.S. Army Engineer Research and Development Center, Vicksburg, MS 39180, USA
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| Abstract: | In this paper, we investigate the waves and currents that are generated by vessels moving in narrow navigation channels. A slender-body approximation is adopted for the flow field near the ship while a weakly dispersive asymptotic model is adopted for the flow field far from the ship. The matched asymptotic expansions method is used to match the slender body solution in the near field with the shallow water approximation for the far field. At leading order, the ship is represented by a moving distribution of sources placed along the ship's centerline in the far-field problem. A time-domain, finite difference method is used to solve the resulting set of Boussinesq-type equations. The numerical model is used to investigate the effect of changes in the reflective properties of the channel boundaries on the water level fluctuations and circulation pattern in confined waterways. Numerical model predictions are also compared with data obtained from field experiments in the Mississippi River – Gulf Outlet (MRGO) channel. |
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