潮汐消散的形态动力反馈引发了微潮沼泽的消失

Geology Pub Date : 2024-02-09 DOI:10.1130/g51798.1
S. Zapp, G. Mariotti
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引用次数: 0

摘要

沿海沼泽的消失通常归因于外部作用力的变化,如海平面上升速率的增加或沉积物供应的减少。在这里,我们展示了大面积沼泽消失可能仅由内部机制造成,特别是由自生潮汐窒息造成。当沼泽被填平时,海床摩擦增加了潮汐消散,最终减小了向陆部分的潮差。潮差减小会减少沼泽平台上的沉积物输入,并增加池塘积水,即使海平面上升速度不大,也会导致沼泽内部损失。据预测,这一过程将发生在耗散型微潮汐沼泽中,而这些沼泽正经历着全球最快的沼泽消失速度。考虑这一机制对于理解沼泽丧失、海平面上升和沉积物供应之间的关系以及最终预测未来沼泽演变至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tidal dissipation morphodynamic feedback triggers loss of microtidal marshes
Coastal marsh loss is commonly attributed to changes in external forcings, such as an increase in sea-level rise rate or a reduction in sediment supply. Here we show that extensive marsh loss can be caused by internal mechanisms alone, and specifically by autogenic tidal choking. This occurs when the marsh fills in, increasing tidal dissipation by bed friction and eventually decreasing the tidal range in its landward section. The reduced tidal range decreases sediment import on the marsh platform and increases ponding, both of which lead to interior marsh loss even with modest sea-level rise rates. This process is predicted to occur in dissipative microtidal marshes, which are experiencing some of the fastest rates of marsh loss worldwide. Considering this mechanism is essential to understanding the relationship between marsh loss, sea-level rise, and sediment supply and to eventually predicting future marsh evolution.
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