The response of tidal range in tidal marshes under sea-level rise (SLR) is essential to the marsh resilience, but how tidal ranges respond to different marsh evolutions remains unclear. Here, we show the existence of bifurcate responses of tidal range to SLR using both numerical model and theoretical analyses. The tidal range tends to increase if marsh accretion keeps pace with SLR; otherwise, the tidal range tends to decrease. As tidal range plays the key role in marsh evolution, the interactions between changing tidal range and marsh evolution lead to positive feedback on marsh resilience. If the marsh accretion can keep up with the SLR, the increase in the tidal range can enhance marsh resilience to SLR. If the marsh cannot keep up, the decrease in the tidal range may further threaten the marsh resilience or even lead to marsh retreat.

中文翻译：

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潮差对河口海平面上升与沼泽演化的分岔响应

海平面上升（SLR）下潮汐沼泽的潮差响应对沼泽恢复力至关重要，但潮差如何响应不同的沼泽演化尚不清楚。在这里，我们使用数值模型和理论分析表明潮差对 SLR 的分叉响应的存在。如果沼泽增生与 SLR 保持同步，潮差往往会增加；否则，潮差趋于减小。由于潮差在沼泽演化中起着关键作用，潮差变化与沼泽演化之间的相互作用导致了对沼泽恢复力的正反馈。如果沼泽的增生能够跟上 SLR，潮差的增加可以增强沼泽对 SLR 的恢复能力。如果沼泽跟不上，潮差的减小可能会进一步威胁沼泽的恢复力，甚至导致沼泽退缩。