Three-dimensional numerical modelling of wind-driven circulation in a homogeneous lake |
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Authors: | Mü steyde B. Ko yigit,Roger A. Falconer |
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Affiliation: | aDepartment of Civil Engineering, Gazi University, Maltepe 06570, Ankara, Turkey;bHydroenvironmental Research Centre, Cardiff School of Engineering, Cardiff University, P.O. Box 925, Cardiff CF24 0YF, UK |
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Abstract: | A three-dimensional numerical model has been developed to study wind-induced circulation patterns in a shallow homogeneous lake with a complex bathymetry. The governing equations are the unsteady Reynolds-Averaged Navier–Stokes equations in which the non-hydrostatic pressure distribution has been included. The model was tested against analytical solutions and laboratory data for wind-induced currents and then applied to Esthwaite Water, a small lake in Cumbria, UK. The model was used to study the main model parameters and to generate typical circulation patterns for a variety of conditions in the lake. Simulations showed that a non-hydrostatic pressure distribution did not have any noticeable influence on the overall circulation pattern in the lake. However, comparisons with field data at some measurement stations in the near-shore region with sharply varying bottom topography showed that the hydrodynamic pressure component had some influence on the vertical velocity profile. |
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Keywords: | Wind-induced circulation Lake circulation Numerical modelling Non-hydrostatic pressure Semi-implicit Finite difference method |
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