Equilibrium beach profile model for perched beaches |
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| Authors: | M Gonzlez R Medina M A Losada |
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| Institution: | a Ocean and Coastal Research Group, Departamento de Ciencias y Técnicas del Agua y del Medio Ambiente, Universidad de Cantabria, 39005 Santander, Spain;b Departamento de Mecánica de Fluidos y Ciencias Térmicas, Universidad del Valle, A.A. 25360, Cali, Colombia;c Universidad de Granada, Departamento de Ingeniería Civil, Campus de Cartuja, 18071 Granada, Spain |
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| Abstract: | A beach profile equilibrium model for perched beaches is presented. The model assumes that wave reflection at the seaward and leeward sides of the breakwater is the most important process that modifies Dean's equilibrium profile model for non-perched beaches. The influence of wave breaking over the submerged structure is also discussed. Several laboratory data sets are used to analyze the merit of the proposed model for describing the equilibrium condition of a perched beach. A good comparison is obtained. Results show that if the ratio between the water depth above the submerged structure, d, and the water depth at the toe of the structure, he, is large, d/he>0.5, only minor advance of the shoreline is achieved with the construction of a toe structure. A considerable advance is obtained for d/he less that 0.1. In these situations, however, resonant effects may result in an inefficient structure. The proposed model is used to provide an estimation for the required sand volume and the associated beach advance for the case of narrow breakwaters. |
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| Keywords: | Beaches Coastal engineering Mathematical models Water waves Breakwaters Erosion Equilibrium beach profile model Submerged breakwaters |
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