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Article

Morphodynamics and Evolution of Estuarine Sandspits along the Bight of Benin Coast, West Africa

1
Department of Civil and Environmental Engineering, Tohoku University, Aoba 6-6-06, Sendai 980-8579, Japan
2
International Research Institute of Disaster Science, Tohoku University, Aoba 4681-1, Sendai 980-8572, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Maria Mimikou and Achim A. Beylich
Water 2021, 13(21), 2977; https://doi.org/10.3390/w13212977
Received: 30 August 2021 / Revised: 18 October 2021 / Accepted: 19 October 2021 / Published: 21 October 2021
It is well known that estuarine systems are significantly affected by hydrodynamic conditions such as river discharge, storm surges, waves and tidal conditions. In addition to this, human interferences through developmental projects have the capability of disrupting the natural morphological processes occurring at estuaries. In West Africa, the goal to improve standards of living through large-scale dam construction, offshore ports and coastal erosion countermeasures has triggered alarming changes in the morphodynamics of estuarine systems. The estuaries at the Volta River mouth (Ghana) and “Bouche du Roi” inlet (Benin), located along the Bight of Benin coast, West Africa, were selected as two case study sites to examine their long-term morphodynamics and sandspit evolution. In this study, we primarily analyzed estuarine morphology using remotely sensed images acquired from 1984 to 2020. We further estimated the longshore sediment transport for this region using results from the image analysis and the depth of active sediment motion. Our results reveal that the longshore sediment transport rates for this region are in the magnitude of 105–106 m3/year. Comparative analysis with other estuaries and sandy coasts suggests that the longshore sediment transport along this coast has one of the largest rates estimated in the world. View Full-Text
Keywords: estuarine systems; river mouth; tidal inlet; longshore sediment transport; morphodynamics; satellite image analysis; sandspit; coastal erosion; morphological evolution; Bight of Benin estuarine systems; river mouth; tidal inlet; longshore sediment transport; morphodynamics; satellite image analysis; sandspit; coastal erosion; morphological evolution; Bight of Benin
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MDPI and ACS Style

Lawson, S.K.; Tanaka, H.; Udo, K.; Hiep, N.T.; Tinh, N.X. Morphodynamics and Evolution of Estuarine Sandspits along the Bight of Benin Coast, West Africa. Water 2021, 13, 2977. https://doi.org/10.3390/w13212977

AMA Style

Lawson SK, Tanaka H, Udo K, Hiep NT, Tinh NX. Morphodynamics and Evolution of Estuarine Sandspits along the Bight of Benin Coast, West Africa. Water. 2021; 13(21):2977. https://doi.org/10.3390/w13212977

Chicago/Turabian Style

Lawson, Stephan Korblah, Hitoshi Tanaka, Keiko Udo, Nguyen Trong Hiep, and Nguyen Xuan Tinh. 2021. "Morphodynamics and Evolution of Estuarine Sandspits along the Bight of Benin Coast, West Africa" Water 13, no. 21: 2977. https://doi.org/10.3390/w13212977

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