From seasonal flood pulse to seiche: Multi-frequency water-level fluctuations in a large shallow tropical lagoon (Nokoue Lagoon, Benin)

Chaigneau A.; Morel Y.; Benoist M.Duhaut T.Okpeitcha O.V.Assogba A.Sohou Z.Honfo J.Stieglitz T.Allamel P.Awoulmbang Sakpak T.D.Retif F.Peugeot C.

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From seasonal flood pulse to seiche: Multi-frequency water-level fluctuations in a large shallow tropical lagoon (Nokoue Lagoon, Benin)

机译：From seasonal flood pulse to seiche: Multi-frequency water-level fluctuations in a large shallow tropical lagoon (Nokoue Lagoon, Benin)

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? 2022 Elsevier LtdThis study investigated the main water-level (WL) variability modes of Nokoué Lagoon in Benin (West-Africa). The average WL ranges between 1.3 and 2.3 m between the low- and high-water seasons. Seasonal as well as weak interannual variations between 2018 and 2019 are driven by rainfall regime over the catchment and associated river inflow. At sub-monthly scales, the lagoon is tidally choked: ocean tides can reach 90 cm, whereas in the lagoon semi-diurnal and diurnal tides hardly reach few centimeters. Choking conditions vary with river inflow and ocean tide amplitude, correctly represented by a simple tidal choking model. Diurnal modulation and asymmetry of the tide are stronger (weaker) during high (low) water period. We also observed WL variations of ±5–10 cm at a fortnightly frequency, stronger during wet (high-water) season. Superimposed on the seasonal, fortnightly and tidal WL variations, we further observed short-term high-frequency seiche events. Mostly observed during dry (low-water) conditions, they are characterized by typical standing-wave oscillations of 5–10 cm amplitudes and 3 h periods. They are forced by the passage of fast-moving squall-lines that induce strong wind variations, heavy rainfalls and rapid drop-off of the air temperature. Results obtained in this study provide useful metrics for the validation of flood forecasting models to be implemented in Benin, and elsewhere on the West African coastline.

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《Estuarine coastal and shelf science》 |2022年第5期|107767.1-107767.12|共12页
作者
Chaigneau A.; Morel Y.; Benoist M.Duhaut T.Okpeitcha O.V.Assogba A.Sohou Z.Honfo J.Stieglitz T.Allamel P.Awoulmbang Sakpak T.D.Retif F.Peugeot C.;
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Institut de Recherches Halieutiques et Océanologiques du Bénin (IRHOB);

International Chair in Mathematical Physics and Applications (ICMPA–UNESCO Chair) University of Abomey‐Calavi;

Aix-Marseille Université CNRS IRD INRAE Coll France CEREGESTATMarineLaboratoire des Technologies et Sciences Appliquées Université de DoualaRETIF FABIEN PHILIAN Montferrier sur LezHydrosciences Montpellier (HSM) IRD Univ. Montpellier CNRS IMTLaboratoire d’études en Géophysique et Océanographie Spatiale (LEGOS) Université de Toulouse CNES CNRS IRD UPS|Institut de Recherches Halieutiques et Océanologiques du Bénin (IRHOB)|International Chair in Mathematical Physics and Applications (ICMPA–UNESCLaboratoire d’études en Géophysique et Océanographie Spatiale (LEGOS) Université de Toulouse CNES CNRS IRD UPSLaboratoire d’études en Géophysique et Océanographie Spatiale (LEGOS) Université de Toulouse CNES CNRS IRD UPS|Institut de Recherches Halieutiques et Océanologiques du Bénin (IRHOB)Institut de Recherches Halieutiques et Océanologiques du Bénin (IRHOB)|International Chair in Mathematical Physics and Applications (ICMPA–UNESCO Chair) University of Abomey‐Calavi|Laboratoire d'Hydrologie Appliquée (LHA) Institut National de l'Eau (INE);

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Lagoons; Nokoué; Seiches; Tides; Water-levels; Wavelet analysis;

From seasonal flood pulse to seiche: Multi-frequency water-level fluctuations in a large shallow tropical lagoon (Nokoue Lagoon, Benin)

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