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Water 2017, 9(6), 447; doi:10.3390/w9060447

Beach Response to Wave Forcing from Event to Inter-Annual Time Scales at Grand Popo, Benin (Gulf of Guinea)

1
Fishery Resources Laboratory, University of Douala, BP 2701 Douala, Cameroon
2
LEGOS (Université Paul Sabatier de Toulouse/CNRS/CNES/IRD), 31400 Toulouse, France
3
Institut de Recherches Halieutiques et Océanologiques du Bénin, 03 BP 1665 Cotonou, Benin
4
International Chair in Mathematical Physics and Applications/Unesco Chair, University of Abomey-Calavi, 01 BP 526 Cotonou, Benin
*
Author to whom correspondence should be addressed.
Received: 31 March 2017 / Revised: 14 June 2017 / Accepted: 16 June 2017 / Published: 21 June 2017
(This article belongs to the Special Issue Sediment Transport in Coastal Waters)
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Abstract

This paper assesses the morphological storm-event impact, seasonal cycles, trends of wave forcing, and beach’s response at the coastal area of Grand Popo, Benin. Three and a half years’ worth of data were collected from 2013 to 2016, using a video system calibrated with field data collected during a 10 day experiment. A comparison was carried out with Wavewatch III IOWAGA wave hindcast data. The along-shore-averaged shoreline position exhibited a seasonal pattern, which was related more to the average wave height than the average storm intensity. Storms occur in austral winter (June, July, August, and September). Based on 12 storms, the results revealed that the average storm duration was 1.6 days, with a mean erosion of 3.1 m. The average post-storm beach recovery duration was 15 days, and the average recovery rate was 0.4 m/day. The impact of storms was more or less amplified depending on the eroding and accreting periods of the wave climate. There was an inter-annual eroding trend of about −1.6 m/year, but the causes of this trend could not be explained. View Full-Text
Keywords: shoreline; waves forcing; storms; resilience; post-storm recovery; Bight of Benin; seasonal cycle; trend shoreline; waves forcing; storms; resilience; post-storm recovery; Bight of Benin; seasonal cycle; trend
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Abessolo Ondoa, G.; Bonou, F.; Tomety, F.S.; du Penhoat, Y.; Perret, C.; Degbe, C.G.E.; Almar, R. Beach Response to Wave Forcing from Event to Inter-Annual Time Scales at Grand Popo, Benin (Gulf of Guinea). Water 2017, 9, 447.

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