受波浪影响的沼泽边缘的季节性退缩率

IF 3.5 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Lukas WinklerPrins, Jessica R. Lacy, Mark T. Stacey, Joshua B. Logan, Andrew W. Stevens
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引用次数: 0

摘要

海浪对沼泽边界的侵蚀是沼泽消失的一个主要原因,但很少有研究能捕捉到季节性差异对沼泽边缘退缩率的影响,从而揭示大部分侵蚀发生的时间模式。通过对南旧金山湾陡峭的沼泽边界进行一年的研究,我们发现了一个明显的季节性信号,即春夏季沼泽在强海风的推动下快速后退,但秋冬季沼泽边缘位置变化不大。然而,我们发现,在较平静的季节,靠近沼泽边界的泥滩过渡区域会出现增生,这表明泥滩和侵蚀沼泽峭壁的形态动力学相互交织。我们观察到季节内退缩率的空间异质性很大,但在较长(年和十年)时间尺度上的异质性较小。我们探讨了沼泽边缘退缩率与附近波场特性之间的关系,并将其与现存的关系联系起来,但我们的结果表明,在短(季节)时间尺度上,用简单的模型来处理空间侵蚀/侵蚀变化是很困难的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seasonality of Retreat Rate of a Wave-Exposed Marsh Edge

Wave-driven erosion of marsh boundaries is a major cause of marsh loss, but little research has captured the effect of seasonal differences on marsh-edge retreat rates to illuminate temporal patterns of when the majority of this erosion is occurring. Using five surface models captured over a study year of a marsh with a steep escarped boundary in South San Francisco Bay, we find a pronounced seasonal signal, where rapid marsh retreat in the spring and summer is driven by a strong sea breeze but little change is found in the marsh-edge position in the fall and winter. We found accretion in the mudflat transition region close to the marsh boundary in the calmer seasons however, suggesting intertwined morphodynamics of mudflats and the eroding marsh-scarp. We observed large spatial heterogeneity in retreat rates within seasons, but less on longer (annual and decadal) timescales. The relationship between marsh-edge retreat rates and properties of the wave field nearby is explored and contextualized against extant relationships, but our results speak to the difficulty in addressing spatial erosion/accretion variability on short (seasonal) timescales with simple models.

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来源期刊
Journal of Geophysical Research: Earth Surface
Journal of Geophysical Research: Earth Surface Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
6.30
自引率
10.30%
发文量
162
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