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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-197
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-197
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: development and technical paper 09 Sep 2019

Submitted as: development and technical paper | 09 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

The Coastline Evolution Model 2D (CEM2D) V1.1

Chloe Leach1, Tom Coulthard2, Andrew Barkwith3, Daniel R. Parsons2, and Susan Manson4 Chloe Leach et al.
  • 1School of Geography, The University of Melbourne, Parkville, Melbourne, VIC 3010, Australia
  • 2Department of Geography, Geology and Environmental Science, University of Hull, Hull, HU6 7RX, UK
  • 3British Geological Survey, Environmental Science Centre, Keyworth, Nottingham, NG12 5GG, UK
  • 4Environment Agency, Crosskill House, Mill Lane, Beverley, HU17 9JW, UK

Abstract. Coasts are among the most intensely used environments on the planet, but they also present dynamic and unique hazards including flooding and erosion. Sea level rise and changing wave climates will alter patterns of erosion and deposition, but some existing coastline evolution models are unable to simulate these effects due to their one-dimensional representation of the systems, or of sediment transport processes. In this paper, the development and application of the Coastline Evolution Model 2D (CEM2D) is presented, that incorporates these influences. The model has been developed from the established CEM model and is capable of simulating fundamental cause-effect relationships in coastal systems. The two-dimensional storage and transport of sediment in CEM2D, which is only done in one-dimension in CEM, means it is also capable of exploring the influence of a variable water level on sediment transport and the formation and evolution of morphological features and landforms at the meso-scale, from 10 to 100 years and over 10 to 100 kilometres. The model sits between one-dimensional and three-dimensional models, with the advantage of increased complexity and detail in model outputs compared to the former, but with more efficiency and less computational expense than the latter.

Chloe Leach et al.
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AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Chloe Leach et al.
Model code and software

CEM2D_v1-1_CODE C. Leach https://doi.org/10.5281/zenodo.3341888

Chloe Leach et al.
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Latest update: 15 Nov 2019
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Short summary
Numerical models can be used to understand how coastal systems evolve over time, including likely responses to climate change. However, many existing models aimed at simulating 10–100-year time periods do not represent a vertical dimension and therefore, are unable to include the effect of sea-level rise. The Coastline Evolution Model 2D (CEM2D) presented in this paper is an advance in this field, with the inclusion of the vertical coastal profile against which the water level can be altered.
Numerical models can be used to understand how coastal systems evolve over time, including...
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