The Red Sea Project (RSP) is based on a coastal lagoon with over 90 pristine islands. The project intends to transform the Red Sea coast into a world-class tourist destination. To better understand the regional dynamics and water exchange scenarios in the lagoon, a high-resolution numerical model is implemented. The general and tidal circulation dynamics are then investigated with a particular focus on the response of the lagoon to strong wind jets. Significant variations in winter and summer circulation patterns are identified. The tidal amplitude inside the lagoon is greater than that outside, with strong tidal currents passing over its surrounding coral reef banks. The lagoon rapidly responds to the strong easterly wind jets that occur mainly in winter; it develops a reverse flow at greater depths, and the coastal water elevation is instantly affected. Lagrangian particle simulations are conducted to study the residence time of water in the lagoon. The results suggest that water renewal is slow in winter. Analysis of the Lagrangian coherent structures (LCS) reveals that water renewal is largely linked to the circulation patterns in the lagoon. In winter, the water becomes restricted in the central lagoon with only moderate exchange, whereas in summer, more circulation is observed with a higher degree of interaction between the central lagoon and external water. The results of LCS also highlight the tidal contribution to stirring and mixing while identifying the hotspots of the phenomenon. Our analysis demonstrates an effective approach for studying regional water mixing and connectivity, which could support coastal management in data-limited regions.

红海项目（RSP）基于一个沿海泻湖，有90多个原始岛屿。该项目旨在将红海沿岸改造成世界一流的旅游胜地。为了更好地了解泻湖中的区域动态和水交换情况，实施了一个高分辨率数值模型。然后研究了一般和潮汐环流动力学，特别关注泻湖对强风射流的响应。识别出冬季和夏季的循环模式有显着变化。泻湖内的潮汐幅度大于外面的潮汐，强烈的潮流流过其周围的珊瑚礁堤岸。泻湖迅速响应主要发生在冬季的强东风。它会在更大的深度产生逆流，沿海水位立即受到影响。进行拉格朗日粒子模拟以研究水在泻湖中的停留时间。结果表明，冬季换水较慢。对拉格朗日相干结构（LCS）的分析表明，水的更新与泻湖中的环流模式密切相关。在冬季，中央泻湖中的水受到限制，只有适度的交换，而在夏季，中央泻湖与外部水之间的相互作用程度更高，则观察到更多的循环。LCS的结果还突出了潮汐对搅拌和混合的贡献，同时确定了现象的热点。我们的分析证明了研究区域水混合和连通性的有效方法，