期刊
ESTUARINE COASTAL AND SHELF SCIENCE
卷 267, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2022.107767
关键词
Water -levels; Lagoons; Tides; Seiches; Nokoue '; Wavelet analysis
资金
- IRD
- IRHOB
- ANR @RAction chair medLOC [ANR-14-ACHN-0007-01]
- OmiDelta project of the Embassy of the Netherlands in Benin through National Institute of Water (INE)
- IRD, France
- Agence Nationale de la Recherche (ANR) [ANR-14-ACHN-0007] Funding Source: Agence Nationale de la Recherche (ANR)
This study investigated the main water-level variability modes of Nokoue Lagoon in Benin. Seasonal and weak interannual variations are mainly influenced by rainfall regime and river inflow, while tidal conditions vary with river inflow and ocean tide amplitude. Diurnal modulation and asymmetry of the tide are stronger during high water period.
This study investigated the main water-level (WL) variability modes of Nokoue ' 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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