Exploring Marine and Aeolian Controls on Coastal Foredune Growth Using a Coupled Numerical Model
Exploring Marine and Aeolian Controls on Coastal Foredune Growth Using a Coupled Numerical Model
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DOI：
10.3390/jmse7010013
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发表时间：
2019-01
影响因子：
2.9
通讯作者：
N. Cohn;B. Hoonhout;E. Goldstein;S. de Vries;L. Moore;Orencio Durán Vinent;P. Ruggiero
中科院分区：
文献类型：
--
作者：
N. Cohn;B. Hoonhout;E. Goldstein;S. de Vries;L. Moore;Orencio Durán Vinent;P. Ruggiero
海岸景观的变化代表了空间和时间可变的海洋和风成力量的聚集沉积物输运梯度。存在许多工具，独立地模拟水下和陆上海岸剖面的变化，以响应这些物理力的时间尺度范围。在这方面，沿海前沙丘主要被视为风力驱动的特征。然而，有几个海洋控制沿海前沙丘的生长，如沉积物供应和水分对风成过程的影响。为了更好地理解陆地-海洋界面的相互作用，本文介绍了新的帆板耦合数值模拟框架的发展。Windsurf耦合独立的水下和陆上海岸变化模型来模拟海岸带响应海洋和风成过程的共同演变。在华盛顿，美国的一个非对称的，耗散的海岸系统，展示了模型框架的能力，以模拟沉积物之间的交换近岸，海滩，沙丘为期一年。风浪模拟一般再现观察到的周期的季节性海滩隆起和撤退，以及沙丘的生长，与合理的技巧。探索性模式模拟被用来进一步探索环境强迫变率对年尺度海岸剖面演变的影响。这项工作的研究结果支持的假设，有直接和间接的海洋和气象控制沿海前沙丘侵蚀，这种新的建模工具提供了一种新的手段，探索复杂的形态动力学反馈机制。
Coastal landscape change represents aggregated sediment transport gradients from spatially and temporally variable marine and aeolian forces. Numerous tools exist that independently simulate subaqueous and subaerial coastal profile change in response to these physical forces on a range of time scales. In this capacity, coastal foredunes have been treated primarily as wind-driven features. However, there are several marine controls on coastal foredune growth, such as sediment supply and moisture effects on aeolian processes. To improve understanding of interactions across the land-sea interface, here the development of the new Windsurf-coupled numerical modeling framework is presented. Windsurf couples standalone subaqueous and subaerial coastal change models to simulate the co-evolution of the coastal zone in response to both marine and aeolian processes. Windsurf is applied to a progradational, dissipative coastal system in Washington, USA, demonstrating the ability of the model framework to simulate sediment exchanges between the nearshore, beach, and dune for a one-year period. Windsurf simulations generally reproduce observed cycles of seasonal beach progradation and retreat, as well as dune growth, with reasonable skill. Exploratory model simulations are used to further explore the implications of environmental forcing variability on annual-scale coastal profile evolution. The findings of this work support the hypothesis that there are both direct and indirect oceanographic and meteorological controls on coastal foredune progradation, with this new modeling tool providing a new means of exploring complex morphodynamic feedback mechanisms.