An enhanced depth-averaged tidal model for morphological studies in the presence of rotary currents |
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| Authors: | Simon P Neill Mohammad R Hashemi Alan J Elliott |
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| Institution: | 1. Centre for Applied Marine Sciences, University of Wales (Bangor), Marine Science Laboratories, Menai Bridge, LL59 5AB, UK;2. Department of Water Engineering, Shiraz University, Shiraz, Iran |
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| Abstract: | A simple and efficient method to improve morphological predictions using depth-averaged tidal models is presented. The method includes the contribution of secondary flows in sediment transport using the computed flow field from a depth-averaged model. The method has been validated for a case study using the 3D POLCOMS model and ADCP data. The enhanced depth-averaged tidal model along with the SWAN wave model are applied to morphological prediction around the Lleyn Peninsula and Bardsey Island as a case study in the Irish Sea. Due to the presence of a headland in this area two asymmetrical tidal eddies are developed in which the cyclonic eddy is stronger as a result of Coriolis effects. The results show that the enhanced model can effectively predict formation of sand banks at the centre of cyclonic eddies, while the depth-averaged model, due to its inability to accommodate secondary flow, is inadequate in this respect. |
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| Keywords: | Coastal morphology Sand banks Coriolis force Rotary currents Secondary flow Irish Sea |
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