Sediment budget and sediment availability are direct metrics for evaluating the resilience of coastal bays to sea‐level rise (SLR). Here we use a high‐resolution numerical model of a tidally dominated marsh‐lagoon system to explore feedbacks between SLR and sediment dynamics. SLR augments tidal prism and inundation depth, facilitating sediment deposition on the marsh platform. At the same time, our results indicate that SLR enhances ebb‐dominated currents and increases sediment resuspension, reducing the sediment‐trapping capacity of tidal flats and bays and leading to a negative sediment budget for the entire system. This bimodal distribution of sediments budget trajectories will have a profound impact on the morphology of coastal bays, increasing the difference in elevation between salt marshes and tidal flats and potentially affecting intertidal ecosystems. Our results also clearly indicate that landforms lower with respect to the tidal frame are more affected by SLR than salt marshes.

中文翻译：

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海平面上升引发的泥沙通量差异将重塑沿海海湾

沉积物预算和沉积物的可利用性是评估沿海海湾对海平面上升（SLR）的复原力的直接指标。在这里，我们使用潮汐控制的沼泽泻湖系统的高分辨率数值模型来探索单反和沉积物动力学之间的反馈。SLR扩大了潮汐棱镜和淹没深度，有助于沉积物沉积在沼泽平台上。同时，我们的结果表明，SLR增强了退潮主导的水流并增加了泥沙的悬浮，降低了滩涂和海湾的泥沙截留能力，并导致整个系统的泥沙收支为负。沉积物预算轨迹的这种双峰分布将对沿海海湾的形态产生深远的影响，增加盐沼和滩涂之间的海拔差异，并可能影响潮间带生态系统。我们的结果也清楚地表明，相对于潮汐框架而言，地貌较低的地形比盐沼受SLR影响更大。