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Developing a Process Driven Morphological Model for Long Term Evolution of a Dynamic Coastal Embayment

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Document pages: 17 pages

Abstract: Numerical modelling of coastal morphology is a complex and sometimesunrewarding exercise and often not yielding tangible results. Typically, theunderlying drivers of morphology are not properly accounted for in numericalmodels. Such inaccuracies combined with a paucity of validation data create adifficulty for coastal planners engineers who are required to interpret suchmorphological models to develop coastal management strategies. This studydevelops an approach to long term morphological modelling of a barrier beach systemthat includes the findings of over 10 years of coastal monitoring on a dynamiccoastal system. The novel approach to predicting the long term evolution of thearea combines a mix of short term hydrodynamic monitoring and long termmorphological modelling to predict future changes in a breached barrier system.A coupled wave, wind, hydrodynamic and sediment transport numerical model wasused to predict the coastal evolution in the dynamic barrier beach system ofInner Dingle Bay, Co. Kerry, Ireland. The modelling approach utilizes theschematisation of inputs to reflect observed trends. The approach is subject totwo stages of validation both quantitative and qualitative. The studyhighlights the importance of considering all the parameters responsible fordriving coastal evolution and the necessity to have long term monitoringresults for trend based validation.

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