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Modeling the Bight of Benin (Gulf of Guinea, West Africa) coastline response to natural and anthropogenic forcing

Abessolo, Grégoire O. ; Hoan, Le Xuan LU ; Larson, Magnus LU and Almar, Rafael (2021) In Regional Studies in Marine Science 48.
Abstract

The 400-km long coast of the Bight of Benin, formed by sand barriers and lagoons, is bordered to the east by the Niger River Delta and to the west by the Volta River Delta and is characterized by several coastal infrastructures, of which the most important are the deep water harbors of Lomé, Cotonou, and Lagos. In this study, an enhanced version of the CASCADE coastal evolution model was implemented in order to reproduce the evolution of the coast over the period 2000-2015, considering the presence of coastal infrastructure, inlets, and the reduced sediment influx from rivers. The model results showed simulated coastal response around the main coastal infrastructure in agreement with observed data. In addition, the validated model was... (More)

The 400-km long coast of the Bight of Benin, formed by sand barriers and lagoons, is bordered to the east by the Niger River Delta and to the west by the Volta River Delta and is characterized by several coastal infrastructures, of which the most important are the deep water harbors of Lomé, Cotonou, and Lagos. In this study, an enhanced version of the CASCADE coastal evolution model was implemented in order to reproduce the evolution of the coast over the period 2000-2015, considering the presence of coastal infrastructure, inlets, and the reduced sediment influx from rivers. The model results showed simulated coastal response around the main coastal infrastructure in agreement with observed data. In addition, the validated model was used to estimate the amount of sediment needed to control erosion through beach nourishment downstream of the harbors. The impact of reducing sediment input on coastal evolution was investigated through model parameterization of the influx at the boundary. Overall, the model may be a useful tool for improving regional coastal policies in the Bight of Benin.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bight of Benin, Coastal management, Harbor, Inlet, Sediment transport rate, Shoreline evolution model
in
Regional Studies in Marine Science
volume
48
article number
101995
publisher
Elsevier
external identifiers
  • scopus:85122663713
ISSN
2352-4855
DOI
10.1016/j.rsma.2021.101995
language
English
LU publication?
yes
id
4067ec8b-b909-4523-9a73-cf64984cd30d
date added to LUP
2022-03-04 15:13:14
date last changed
2022-04-27 19:21:19
@article{4067ec8b-b909-4523-9a73-cf64984cd30d,
  abstract     = {{<p>The 400-km long coast of the Bight of Benin, formed by sand barriers and lagoons, is bordered to the east by the Niger River Delta and to the west by the Volta River Delta and is characterized by several coastal infrastructures, of which the most important are the deep water harbors of Lomé, Cotonou, and Lagos. In this study, an enhanced version of the CASCADE coastal evolution model was implemented in order to reproduce the evolution of the coast over the period 2000-2015, considering the presence of coastal infrastructure, inlets, and the reduced sediment influx from rivers. The model results showed simulated coastal response around the main coastal infrastructure in agreement with observed data. In addition, the validated model was used to estimate the amount of sediment needed to control erosion through beach nourishment downstream of the harbors. The impact of reducing sediment input on coastal evolution was investigated through model parameterization of the influx at the boundary. Overall, the model may be a useful tool for improving regional coastal policies in the Bight of Benin.</p>}},
  author       = {{Abessolo, Grégoire O. and Hoan, Le Xuan and Larson, Magnus and Almar, Rafael}},
  issn         = {{2352-4855}},
  keywords     = {{Bight of Benin; Coastal management; Harbor; Inlet; Sediment transport rate; Shoreline evolution model}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Regional Studies in Marine Science}},
  title        = {{Modeling the Bight of Benin (Gulf of Guinea, West Africa) coastline response to natural and anthropogenic forcing}},
  url          = {{http://dx.doi.org/10.1016/j.rsma.2021.101995}},
  doi          = {{10.1016/j.rsma.2021.101995}},
  volume       = {{48}},
  year         = {{2021}},
}