Sediment Supply Explains Long-Term and Large-Scale Patterns in Salt Marsh Lateral Expansion and Erosion
Sediment Supply Explains Long-Term and Large-Scale Patterns in Salt Marsh Lateral Expansion and Erosion
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DOI：
10.1029/2019gl083315
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发表时间：
2019-10-29
影响因子：
5.2
通讯作者：
Skov, Martin W.
中科院分区：
文献类型：
--
作者：
Ladd, Cai J. T.;Duggan-Edwards, Mollie F.;Skov, Martin W.
盐沼在横向上经常经历迅速的变化，其原因缺乏共同的解释。我们结合联合收割机的水文，沉积学和气候学数据与历史地图和照片的分析表明，横向沼泽变化的长期模式可以解释大规模的变化，沉积物供应和波浪驱动的运输。150年来，英国北方沼泽扩张，而南方大部分沼泽被侵蚀。造成这种格局的原因是由北向南减少泥沙通量和取驱动波沉积物再悬浮和运输。我们的研究提供了长期和大规模的证据，沉积物供应是横向沼泽动态的关键调节器。目前全球流入海岸的沉积物减少，可能会削弱盐沼和其他沉积生态系统对海平面上升的适应能力。管理沉积物供应并不常见，但对减轻气候变化对沿海的影响可能至关重要。
Salt marshes often undergo rapid changes in lateral extent, the causes of which lack common explanation. We combine hydrological, sedimentological, and climatological data with analysis of historical maps and photographs to show that long-term patterns of lateral marsh change can be explained by large-scale variation in sediment supply and its wave-driven transport. Over 150 years, northern marshes in Great Britain expanded while most southern marshes eroded. The cause for this pattern was a north to south reduction in sediment flux and fetch-driven wave sediment resuspension and transport. Our study provides long-term and large-scale evidence that sediment supply is a critical regulator of lateral marsh dynamics. Current global declines in sediment flux to the coast are likely to diminish the resilience of salt marshes and other sedimentary ecosystems to sea level rise. Managing sediment supply is not common place but may be critical to mitigating coastal impacts from climate change.