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

Leach, Chloe; Coulthard, Tom; Barkwith, Andrew; Parsons, Daniel R.; Manson, Susan


Chloe Leach

Andrew Barkwith

Daniel R. Parsons

Susan Manson


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 the sediment transport processes. In this paper, the development and application of the Coastline Evolution Model 2D (CEM2D) are presented, a model which incorporates these influences. The model has been developed from the established CEM and is capable of simulating fundamental cause-effect relationships in coastal systems. The two-dimensional storage and transport of sediment in CEM2D, which are only done in one-dimension in CEM, mean 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 mesoscale. 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.


Leach, C., Coulthard, T., Barkwith, A., Parsons, D. R., & Manson, S. (2021). The Coastline Evolution Model 2D (CEM2D) V1.1. Geoscientific Model Development, 14, 5507-5523.

Journal Article Type Article
Acceptance Date Jul 22, 2021
Online Publication Date Sep 7, 2021
Publication Date Sep 7, 2021
Deposit Date Aug 9, 2022
Publicly Available Date Aug 9, 2022
Journal Geoscientific Model Development
Print ISSN 1991-9603
Electronic ISSN 1991-9603
Publisher European Geosciences Union
Peer Reviewed Peer Reviewed
Volume 14
Pages 5507-5523
Public URL
Additional Information The current version of the Coastline Evolution Model 2D (CEM2D) is available from the project website (, last access: 16 August 2021) and on Zenodo (, Leach, 2019) distributed under the terms of the GNU General Public License.


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