Spatial and temporal scales of shoreline morphodynamics derived from video camera observations for the island of Sylt, German Wadden Sea

Spatial and temporal scales of shoreline morphodynamics derived from video camera observations for the island of Sylt, German Wadden Sea
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来自德国瓦登海叙尔特岛摄像机观测的海岸线形态动力学的时空尺度

DOI:
10.1007/s00367-016-0461-7
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发表时间:
2017
期刊:
影响因子:
2.1
通讯作者:
Winter
Winter
中科院分区:
地球科学4区
文献类型:
--
作者:
Blossier;Winter

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根据2011年至2014年沿着1.3 km长的桑迪海滩的连续摄像机监测数据,对德国瓦登海叙尔特岛的海滩形态动力学的时空尺度进行了评估。它们的作用是根据调查的时间间隔和沿岸分辨率,在这个地点量化海滩监测计划所涵盖的海岸线变化量。相关方法,用于量化沿岸的空间尺度的海岸线起伏,结合半经验建模和频谱分析的海岸线的时间波动。数据表明,在2011-2014年研究期间,沿岸分辨率为150米,每月调查时间间隔捕获了70%的南极尺度海岸线变化。沿岸间距为10 m,调查时间间隔为5天,以监测95%的海岸线时间波动方差,空间方差变化步长为5%。虽然监测战略,如土地或航空测量是可靠的数据收集方法,视频摄像机部署仍然是最便宜的技术,提供高时空分辨率所需的监测submartre-scale的形态动力学过程,例如,涉及小型到中型海滩营养。
Spatial and temporal scales of beach morphodynamics were assessed for the island of Sylt, German Wadden Sea, based on continuous video camera monitoring data from 2011 to 2014 along a 1.3 km stretch of sandy beach. They served to quantify, at this location, the amount of shoreline variability covered by beach monitoring schemes, depending on the time interval and alongshore resolution of the surveys. Correlation methods, used to quantify the alongshore spatial scales of shoreline undulations, were combined with semi-empirical modelling and spectral analyses of shoreline temporal fluctuations. The data demonstrate that an alongshore resolution of 150 m and a monthly survey time interval capture 70% of the kilometre-scale shoreline variability over the 2011–2014 study period. An alongshore spacing of 10 m and a survey time interval of 5 days would be required to monitor 95% variance of the shoreline temporal fluctuations with steps of 5% changes in variance over space. Although monitoring strategies such as land or airborne surveying are reliable methods of data collection, video camera deployment remains the cheapest technique providing the high spatiotemporal resolution required to monitor subkilometre-scale morphodynamic processes involving, for example, small- to middle-sized beach nourishment.
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