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Multi-timescale morphological modelling of a dune-fronted sandy beach

Harshinie Karunarathna Orcid Logo, Jennifer Brown, Antonia Chatzirodou, Pushpa Dissanayake, Paul Wisse

Coastal Engineering, Volume: 136, Pages: 161 - 171

Swansea University Author: Harshinie Karunarathna Orcid Logo

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DOI (Published version): 10.1016/j.coastaleng.2018.03.005

Abstract

Medium/long term trends (annual to decadal scale) of beach change are mostly used to make coastal management decisions. However, short term, extreme episodic events (short term) can erode the beach to exceed sustainable erosion thresholds thereby impacting long term trends of coastal change. Therefo...

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Published in: Coastal Engineering
ISSN: 0378-3839
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa39004
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spelling 2019-09-05T10:11:38.2870986 v2 39004 2018-03-09 Multi-timescale morphological modelling of a dune-fronted sandy beach 0d3d327a240d49b53c78e02b7c00e625 0000-0002-9087-3811 Harshinie Karunarathna Harshinie Karunarathna true false 2018-03-09 CIVL Medium/long term trends (annual to decadal scale) of beach change are mostly used to make coastal management decisions. However, short term, extreme episodic events (short term) can erode the beach to exceed sustainable erosion thresholds thereby impacting long term trends of coastal change. Therefore, understanding coastal change at short and medium-long term (years to decades) timescales is essential to provide sustainable solutions to beach erosion. In this paper, we investigate and simulate the change of a beach-dune system for a megatidal coastline in the UK at storm timescale and at medium-long term timescale corresponding to sea level rise, in order to assess their significance in terms of beach management. The field site of choice is the Sefton coast, located in Liverpool Bay, United Kingdom. The approach used here involves process based modelling to determine storm-induced beach erosion and the application of modified Bruun Rule (Dean and Houston, 2016) to determine medium-long term evolution associated with climate change impacts. The application of the process-based model, XBeach, reveals that storm-induced short term beach erosion can be in the same scale or may surpass average medium/long term erosion thresholds and therefore, should be taken in to account when managing coastlines. Despite the complexities of the megatidal Sefton coast, the modified Bruun Rule proved to be capable of capturing long term beach profile change and assures that it can be confidently used to determine medium-long term beach-dune change due to sea level rise, once reliable estimates of longshore transport and sediment sources/sinks are made. Journal Article Coastal Engineering 136 161 171 0378-3839 Morphology change; Bruun rule; XBeach; Sefton coast; Storm impact; Beach-dune erosion 30 6 2018 2018-06-30 10.1016/j.coastaleng.2018.03.005 The paper presents a novel combined process-based and behavioural coastal morphodynamic modelling approach for forecasting multi-timescale coastal change. This paper is a product of EPSRC FloodMEMORY (EP/K013513/1) and an Impact Acceleration Grant ‘Are simple estimates of coastal recession enough for sustainable coastal management?’ projects. The methodology developed in this paper led to NERC Mitigating hydro meteorological hazard impacts through transboundary river management in the Ciliwong River basin (NE/S003282/1) project and two invited talks in Ocean University China and Kanazawa University Japan. COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2019-09-05T10:11:38.2870986 2018-03-09T08:27:37.5649659 Harshinie Karunarathna 0000-0002-9087-3811 1 Jennifer Brown 2 Antonia Chatzirodou 3 Pushpa Dissanayake 4 Paul Wisse 5 0039004-27032018093311.pdf karunarathna2018.pdf 2018-03-27T09:33:11.1100000 Output 3073776 application/pdf Version of Record true 2018-03-27T00:00:00.0000000 true eng
title Multi-timescale morphological modelling of a dune-fronted sandy beach
spellingShingle Multi-timescale morphological modelling of a dune-fronted sandy beach
Harshinie Karunarathna
title_short Multi-timescale morphological modelling of a dune-fronted sandy beach
title_full Multi-timescale morphological modelling of a dune-fronted sandy beach
title_fullStr Multi-timescale morphological modelling of a dune-fronted sandy beach
title_full_unstemmed Multi-timescale morphological modelling of a dune-fronted sandy beach
title_sort Multi-timescale morphological modelling of a dune-fronted sandy beach
author_id_str_mv 0d3d327a240d49b53c78e02b7c00e625
author_id_fullname_str_mv 0d3d327a240d49b53c78e02b7c00e625_***_Harshinie Karunarathna
author Harshinie Karunarathna
author2 Harshinie Karunarathna
Jennifer Brown
Antonia Chatzirodou
Pushpa Dissanayake
Paul Wisse
format Journal article
container_title Coastal Engineering
container_volume 136
container_start_page 161
publishDate 2018
institution Swansea University
issn 0378-3839
doi_str_mv 10.1016/j.coastaleng.2018.03.005
document_store_str 1
active_str 0
description Medium/long term trends (annual to decadal scale) of beach change are mostly used to make coastal management decisions. However, short term, extreme episodic events (short term) can erode the beach to exceed sustainable erosion thresholds thereby impacting long term trends of coastal change. Therefore, understanding coastal change at short and medium-long term (years to decades) timescales is essential to provide sustainable solutions to beach erosion. In this paper, we investigate and simulate the change of a beach-dune system for a megatidal coastline in the UK at storm timescale and at medium-long term timescale corresponding to sea level rise, in order to assess their significance in terms of beach management. The field site of choice is the Sefton coast, located in Liverpool Bay, United Kingdom. The approach used here involves process based modelling to determine storm-induced beach erosion and the application of modified Bruun Rule (Dean and Houston, 2016) to determine medium-long term evolution associated with climate change impacts. The application of the process-based model, XBeach, reveals that storm-induced short term beach erosion can be in the same scale or may surpass average medium/long term erosion thresholds and therefore, should be taken in to account when managing coastlines. Despite the complexities of the megatidal Sefton coast, the modified Bruun Rule proved to be capable of capturing long term beach profile change and assures that it can be confidently used to determine medium-long term beach-dune change due to sea level rise, once reliable estimates of longshore transport and sediment sources/sinks are made.
published_date 2018-06-30T03:49:29Z
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score 11.016235

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