Abstract
The purpose of this paper is to present the multidisciplinary approach adopted to undertake a detailed coastal flood and erosion risk management investigation at Cloughaninchy beach (Ireland). The site was severely affected by a series of extreme events with extreme high tide combined with a severe sea swell and onshore winds resulting in severe damage due to flooding and wave action as well as substantial retreat of the dune system. Based on a comprehensive assessment and multidisciplinary studies an appropriate plan was subsequently developed to best manage the risks identified and to further assess the feasibility of the recommended management plan options and measures. The project is an example of how vital the integration of specialized disciplines (coastal engineering, hydraulic flood modelling and coastal morphology) is in the determination of the appropriate protection measures for coastal sites.
Highlights
BackgroundIn January 2014 significant areas of the west coast of Ireland were subject to severe coastal storm events
On Friday morning, 3 January 2014 a combination of high tide, substantial sea swell and extreme onshore winds resulted in severe damage to the naturally occurring coastal protection infrastructure at Cloughaninchy beach, Co
Numerical models Detailed numerical modelling studies were developed to assess the various risks at the site. These models include: 1) MIKE 21 Spectral Wave model of both the nearshore and offshore area to assess wave influence on both flooding and coastal erosion, 2) MIKE 21 HD coastal flood model where wave overtopping discharges were incorporated into the 2D model, 3) 1D ISIS hydraulic river model and 4) MIKE 21 Litpack model to assess sediment transport
Summary
In January 2014 significant areas of the west coast of Ireland were subject to severe coastal storm events. This study describes the multidisciplinary studies undertaken to assess the coastal risks and develop an appropriate solution and management plan for the site These studies included: wave propagation modeling, tidal flood modeling including overtopping, erosion, fluvial influence, optioneering, coastal management plan and cost-benefit analysis. Description of the site The study area is a 2km coastal area located on the West coast of Ireland and consists of a natural dune system, sandy beach and natural shingle surrounded by rock outcrops (Fig. 2). Following the storm damage in January 2014 Clare County Council constructed emergency coastal works at the southern section consisting of a rock revetment made up of rock armour and fill material
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