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A Computational Investigation of Storm Impacts on Estuary Morphodynamics / Dominic, Reeve; Harshinie, Karunarathna

Journal of Marine Science and Engineering, Volume: 7, Issue: 12, Start page: 421

Swansesa University Authors: Dominic, Reeve, Harshinie, Karunarathna

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DOI (Published version): 10.3390/jmse7120421

Abstract

Global climate change drives sea level rise and changes to extreme weather events, which can affect morphodynamics of coastal and estuary systems around the world. In this paper, a 2D process-based numerical model is used to investigate the combined effects of future mean sea level and storm climate...

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Published in: Journal of Marine Science and Engineering
ISSN: 2077-1312
Published: MDPI AG
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URI: https://cronfa.swan.ac.uk/Record/cronfa52864
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Abstract: Global climate change drives sea level rise and changes to extreme weather events, which can affect morphodynamics of coastal and estuary systems around the world. In this paper, a 2D process-based numerical model is used to investigate the combined effects of future mean sea level and storm climate variabilities on morphological change of an estuary. Morphodynamically complex, meso-tidal Deben Estuary, located in the Suffolk at the east coast of the UK is selected as our case study site. This estuary has experienced very dynamic behaviors in history thus it might be sensitive to the future climate change. A statistical analysis of future storms around this area, derived from a global wave model, has shown a slight increase of storm wave heights and storm occurrences around the estuary in future as a result of global climate variations under medium emission scenario. By using a process-based model and by combining the forecast ‘end-of-century’ mean sea level with statistically derived storm conditions using projected storms over a time slice between 2075–2099, we determined hydrodynamic forcing for future morphodynamic modelling scenarios. It is found that the effect of increased sea level combined with future storms can significantly alter the current prevailing morphodynamic regime of the Deben Estuary thus driving it into a less stable system. It is also found that storm waves can be very significant to morphodynamic evolution of this tide-dominated estuary.
Keywords: Deben Estuary; morphodynamics; numerical modelling; storm impacts; sea level rise; climate change
Issue: 12
Start Page: 421