The coastal dynamics along the sandy beaches in the Algiers bay is strongly influenced by the hydrodynamic agents, morphological factors, human activities, societal infrastructure and presence of hard structures, which disrupts their hydro-sedimentary balance. The present work contributes to the knowledge of hydrodynamic and morpho-sedimentary forcing mechanisms at sandy beaches by focusing on the impact of extreme sea-weather events of the two most contrasting periods of the year (winter and summer) on coastal processes. Two beaches in the eastern part of Algiers bay were studied by combining field measurements of currents and sediment flux with numerical models (MIKE 21/3 Coupled Model FM). The model validation was done based on the measured nearshore current and sediment transport during low to moderate energy swell conditions with current meter ‘Global water Fp101’ and ‘Krauss sediment traps’. Time series of wind and wave established by Infoplaza Marine weather database were used as input at the open boundaries of the model domain. The results showed a reversal of the dominant direction of the longshore currents, and a very high prevalence of cross-shore sediment transport over longshore sediment transport (LST) due to the coarse grain size of the sediment (very coarse sand). The results indicated that, waves coming from the west prevail in winter have an average wave height varies from 1.5 to 2.1 m, driven a longshore current of 0.17–0.27 m/s, with an estimated seasonal cross-shore sediment transport between 1530 and 5540 m³/year/m. During the summer season, waves approaching from the northeast dominate with an average of Hs that does not exceed 1 m, these waves generate a rip current equal to 0.24 m/s and this current can generate a cross-shore sediment flux in the order of 4000 m³/year/m. The results also reveal the development of morphological landforms represented in the submerged longshore bars at the shallow water depending largely on the hydrodynamic conditions and the cross-shore flux between the land/sea interfaces.

阿尔及尔海湾沙滩的沿海动力学受到水动力因素，形态因素，人类活动，社会基础设施和坚硬结构的强烈影响，这破坏了它们的水沙沉积平衡。通过关注一年中两个最相反的时期（冬季和夏季）的极端海洋天气事件对沿海过程的影响，本研究有助于了解沙滩的水动力和形态沉积强迫机制。通过将水流和泥沙通量的现场测量结果与数值模型（MIKE 21/3耦合模型FM）相结合，研究了阿尔及尔湾东部的两个海滩。全球水Fp101”和“克劳斯沉积物陷阱”。由Infoplaza Marine天气数据库建立的风浪时间序列被用作模型域开放边界的输入。结果表明，由于沉积物的粒度较粗（非常粗大的沙粒），因此沿岸流动的主导方向发生了逆转，跨岸沉积物运输相对于沿岸沉积物运输（LST）的普及率很高。结果表明，冬季来自西方的波浪占主导地位，平均波浪高度在1.5至2.1 m之间，驱动的近岸水流为0.17至0.27 m / s，估计的季节性跨岸泥沙运移在1530至5540之间³米/年/米 在夏季，从东北方向来的海浪占主导地位，平均Hs不超过1 m，这些海浪产生等于0.24 m / s的裂隙水流，并且该水流可以产生大约为的跨岸沉积物通量。 4000 m ³ /年/米 研究结果还揭示了浅水淹没的长岸坝所代表的形态地貌的发展，这在很大程度上取决于水动力条件和陆/海界面之间的跨岸通量。