前丘槽井喷及相关抛物状沙丘的地表发育

IF 3.1 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Niels van Kuik , Job de Vries , Christian Schwarz , Gerben Ruessink
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引用次数: 2

摘要

前沙丘槽井喷是在最靠海的沙丘及其毗邻的沉积裂片上形成的细长的风蚀洼地。尽管槽式井喷对海岸沙丘的沙收支和植物多样性具有重要意义,但槽式井喷的时空演变尚不清楚。我们在Google Earth Engine平台上设计了一个自动化工作流程,从20世纪80年代中期以来可用的中分辨率卫星图像中生成井喷表面积的时间序列,并将其应用于荷兰、丹麦和美国的井喷系统。井喷面积在多年、季节性和偶发时间尺度上有所不同。多年变化反映了生长、稳定和衰退阶段的连续发展。从增长到稳定的过渡似乎与井喷形状(宽长比)的变化有关。腐烂阶段开始时,植被阻碍了井喷与海滩的连接;叶片仍可向内陆迁移,并在完全植被覆盖之前发展成抛物面沙丘。井喷面积的季节变化随纬度增大而增大;荷兰和丹麦站点冬季观测到的较大面积可能反映了季节性植物发育和冬季强风的影响。仅在丹麦地区冬季观察到的井喷面积的间歇性增加与明显的前丘侵蚀有关。没有任何偶发事件将井喷改变为不同阶段或持续影响季节性动态。未来的工作应侧重于对井喷面积和沙量变化的综合分析,以提高我们对沙-植被相互作用驱动井喷动力学的认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Surface-area development of foredune trough blowouts and associated parabolic dunes quantified from time series of satellite imagery

Foredune trough blowouts are elongated wind-eroded depressions in the most seaward dune and their adjoining depositional lobes. Despite their importance to the sand budget and floral diversity of coastal dunes, the spatiotemporal evolution of trough blowouts is not well understood. We designed an automated workflow in the Google Earth Engine platform to produce time series of blowout surface area from medium-resolution satellite imagery available since the mid-1980s and applied it to a blowout system in the Netherlands, Denmark and the USA. Blowout surface areas were found to vary on multi-annual, seasonal and episodic time scales. Multi-annual change reflects successive development through stages of growth, stabilization and decay. The transition from growth to stabilization appears to be related to a change in blowout shape (width-to-length ratio). The decay phase starts with vegetation obstructing the blowout connection to the beach; the lobe can still migrate inland and develop into a parabolic dune before also becoming fully vegetated. The seasonal variations in blowout area increase with latitude; the observed larger areas in winter at the Dutch and Danish site presumably reflect seasonal plant development and the effect of stronger winds in winter. Episodic increases in blowout area, observed during winter at the Danish site only, are associated with pronounced foredune erosion. None of the episodic events changed blowouts into a different stage or persistently affected seasonal dynamics. Future work should focus on the combined analysis of changes in blowout area and sand volume to improve our understanding of sand-vegetation interactions driving blowout dynamics.

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来源期刊
Aeolian Research
Aeolian Research GEOGRAPHY, PHYSICAL-
CiteScore
7.10
自引率
6.10%
发文量
43
审稿时长
>12 weeks
期刊介绍: The scope of Aeolian Research includes the following topics: • Fundamental Aeolian processes, including sand and dust entrainment, transport and deposition of sediment • Modeling and field studies of Aeolian processes • Instrumentation/measurement in the field and lab • Practical applications including environmental impacts and erosion control • Aeolian landforms, geomorphology and paleoenvironments • Dust-atmosphere/cloud interactions.
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