Tides in the Casamance estuary: A modeling study

IF 2.2 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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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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卡萨芒斯河口的潮汐：模拟研究

卡萨芒斯河口位于塞内加尔南部，是一个具有显著生态、旅游和经济意义的地区。由于其在旱季的反河口性质，它经历了强烈的季节性盐度变化。本研究旨在描述卡萨芒斯河口西部，从河口到ziiguinchor镇，在旱季的潮汐动态特征。利用高空间分辨率的三维非线性模型，我们重点模拟了潮汐高程和潮流，并通过河口内和河口的海平面和水流测量来评估它们。虽然模拟的潮汐高程与观测一致，揭示了河口内向东的潮汐传播，但河口附近和入海口的潮流被低估了。欧拉剩余环流以向海为主，而拉格朗日剩余环流由于受到斯托克斯漂移的补偿而明显减弱。这项建模研究标志着在卡萨芒斯河口进行全面环境影响评估的关键的第一步，为更深入地了解和保护该地区铺平了道路。

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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.