Tides in the Casamance estuary: A modeling study

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research Pub Date : 2025-02-01 DOI:10.1016/j.csr.2024.105389

Birane Ndom , Siny Ndoye , Bamol Ali Sow , Vincent Echevin

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引用次数: 0

Abstract

The Casamance estuary, located in southern Senegal, is a region of remarkable ecological, tourist and economic significance. It undergoes strong seasonal variations of salinity due to its reverse estuary nature during the dry season. This study aims to characterize tidal dynamics in the western part of the Casamance estuary, spanning from the river mouth to the town of Ziguinchor, during the dry season. Utilizing a three-dimensional, non-linear model with a high spatial resolution, we focused on simulating the tidal elevations and currents and evaluating them with sea level and current measurements both within the estuary and at its mouth. Whereas modelled tidal elevations agreed with observations, revealing eastward tidal propagation within the estuary, tidal currents near the river mouth and into the estuary were underestimated. The Eulerian residual circulation was mainly seaward whereas the Lagrangian residual circulation was significantly weaker due to compensation by the Stokes drift. This modeling study marks a crucial first step towards conducting comprehensive environmental impact assessments in the Casamance estuary, paving the way for a deeper understanding and preservation of this region.

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来源期刊

Continental Shelf Research 地学-海洋学

CiteScore

4.30

自引率

4.30%

发文量

136

审稿时长

6.1 months

期刊介绍： Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.