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Equilibrium erosion of soft rock shores with a shallow or absent beach under increased sea level rise

Lookup NU author(s): Dr Mike Walkden

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Abstract

A process-based numerical model was used to explore the response of soft rock shores with low volume beaches to variable rates of sea level rise. Equilibrium recession rates were simulated for ranges of wave height and period, tidal amplitude, rock strength, beach volume and rate of sea level rise. Equilibrium shore profiles were found to be steeper with higher rates of sea level rise. Beaches were represented as protective surfaces yet were found to cause no significant reduction in equilibrium recession rate when their volumes were below a critical threshold. Reduced equilibrium recession rates were found with beaches that extended sufficiently far below low tide level. The model results imply that, given several constraints, a very simple relationship exists between increased rates of sea level rise and the response of eroding composite soft rock/low volume beach shores. © 2008 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Walkden M, Dickson M

Publication type: Article

Publication status: Published

Journal: Marine Geology

Year: 2008

Volume: 251

Issue: 1-2

Pages: 75-84

Print publication date: 19/05/2008

ISSN (print): 0025-3227

ISSN (electronic): 1872-6151

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.margeo.2008.02.003

DOI: 10.1016/j.margeo.2008.02.003

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