Vegetation control allows autocyclic formation of multiple dunes on prograding coasts
Vegetation control allows autocyclic formation of multiple dunes on prograding coasts
复制标题
植被控制允许在前进的海岸上自动循环形成多个沙丘
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
P. Ruggiero
中科院分区：
文献类型：
--
作者：
L. Moore;O. D. Vinent;P. Ruggiero
我们使用来自华盛顿州长滩半岛（美国）超过15年的沙丘生长记录以及最近发布的沿海沙丘模型（经过修改以包含植被生长和当地沙丘之间的反馈）来研究多个沙丘的形成。坡度。在存在的海岸线的侵蚀，我们发现，多个沙丘脊的形成可以是自循环的，纯粹从内部沙丘动力学，而不是需要在外部条件的变化。我们的研究结果表明，海岸线的渗透率和沙丘的横向增长率的比例是决定多个沙丘的高度，数量和形式的关键，允许可测试的预测的发展。我们的研究结果与观测结果一致，并意味着在使用沙丘脊作为过去气候，海平面，土地利用和构造活动变化的代理时需要谨慎，因为外部事件和多个沙丘的形成之间的关系可能不是以前认为的一对一。
We investigate the formation of multiple dunes using a >15 yr record of dune growth from Long Beach Peninsula, Washington State (USA), and a recently published coastal dune model modified to include a feedback between vegetation growth and local dune slope. In the presence of shoreline progradation, we find that multiple dune ridge formation can be autocyclic, arising purely from internal dune dynamics rather than requiring variations in external conditions. Our results suggest that the ratio of the shoreline progradation rate and the lateral dune growth rate is critical in determining the height, number, and form of multiple dunes, allowing the development of testable predictions. Our findings are consistent with observations and imply that caution is required when using dune ridges as proxies for past changes in climate, sea level, land use, and tectonic activity because the relationship between external events and the formation of multiple dunes may not be one to one as previously thought.