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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Annual to decadal morphodynamics of the foredune system at Greenwich Dunes, Prince Edward Island, Canada
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Annual to decadal morphodynamics of the foredune system at Greenwich Dunes, Prince Edward Island, Canada

机译：加拿大爱德华王子岛格林威治沙丘上，前足系统的年度到年代际形态动力学

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摘要

The purpose of this study was to quantify relationships between season, sediment availability, sediment transport pathways, and beach/foredune morphology at Greenwich Dunes, PEI. This was done for periods ranging from a few days to multiple decades using erosion pins, bedframe measurements, annual surveys, and digital photogrammetry using historical aerial photographs. The relative significance of seasonal/annual processes versus response of the foredune system to broader geomorphic controls (e.g. relative sea level rise, storms, etc.) was also assessed. The data show that there are clear seasonal differences in the patterns of sand supply from the beach to the foredune at Greenwich and that there are differences in sediment supply to the foredune between the east and west reaches of the study area, resulting in ongoing differences in foredune morphology. They also demonstrate that models that incorporate wind climate alone, or even models that include other factors like beach moisture, would not be able to predict the amount of sediment movement from the beach to the foredune in this environment unless there were some way to parameterize system morphology, especially the presence or absence of a dune ramp. Finally, the data suggest that the foredune can migrate landward while maintaining its form via transfers of sediment from the stoss slope, over the crest, and onto the lee slope. Although the rate of foredune development or recovery after disturbance changes over time due to morphological feedback, the overall decadal evolution of the foredune system at Greenwich is consistent with, and supports, the Davidson-Arnott (2005) conceptual model of dune transgression under rising sea level.
机译：这项研究的目的是量化爱德华王子岛格林威治沙丘的季节，沉积物可利用性，沉积物输送途径与海滩/富台山形态之间的关系。使用侵蚀销，床架测量，年度调查以及使用历史航拍照片进行的数字摄影测量，可以完成从几天到几十年不等的时间。还评估了季节/年度过程与前额系统对更广泛的地貌控制的响应（例如相对海平面上升，风暴等）的相对重要性。数据表明，格林威治海滩和沙丘之间的供沙方式存在明显的季节性差异，研究区域东西方之间沙土的供沙量也存在差异，导致研究区域的持续差异。蟾蜍形态。他们还证明，仅采用风气候的模型，甚至包括诸如海滩湿度等其他因素的模型，都无法预测在这种环境下从海滩到前陆的泥沙运动量，除非有某种方法可以对系统进行参数化形态，尤其是是否存在沙丘坡道。最后，数据表明，前陆可以向陆上迁移，同时通过沉积物从高斯斜坡，波峰到背风斜坡的转移来保持其形态。尽管扰动后鱼鳞的发育或恢复的速度会由于形态反馈而随时间变化，但格林威治鱼鳞系统的整体年代际演变与并支持戴维森-阿诺特（Davidson-Arnott，2005年）上升海底沙丘侵害的概念模型水平。

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