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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Rapid adjustment of shoreline behavior to changing seasonality of storms: observations and modelling at an open-coast beach
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Rapid adjustment of shoreline behavior to changing seasonality of storms: observations and modelling at an open-coast beach

机译：迅速调整海岸线行为，以改变风暴季节性：在开放式海岸海滩的观察和建模

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摘要

An 8-year time series of weekly shoreline data collected at the Gold Coast, Australia, is used to examine the temporal evolution of a beach, focusing on the frequency response of the shoreline to time-varying wave height and period. Intriguingly, during 2005 the movement of the shoreline at this site changed from a seasonally-dominated mode (annual cycle) to a storm-dominated (similar to monthly) mode. This unexpected observation provides the opportunity to explore the drivers of the observed shoreline response. Utilizing the calibration of an equilibrium shoreline model to explore the time-scales of underlying beach behavior, the best-fit frequency response (days(-1)) is shown to be an order of magnitude higher post-2004, suggesting that a relatively subtle change in wave forcing can drive a significant change in shoreline response. Analysis of available wave data reveals a statistically significant change in the seasonality of storms, from predominantly occurring at the start of the year pre-2005 to being relatively consistent throughout the year after this time. The observed change from one mode of shoreline variability to another suggests that beaches can adapt relatively quickly to subtle changes in the intra-annual distribution of wave energy. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：澳大利亚黄金海岸收集的每周海岸线数据序列为8年，用于检查海滩的时间演变，专注于海岸线对时变波高度和时期的频率响应。有趣的是，在2005年期间，在本网站的海岸线的运动从季节性主导的模式（年度周期）变为风暴主导的（类似于月度）模式。这种意想不到的观察提供了探索观察到的海岸线反应的驱动程序的机会。利用均衡海岸线模型的校准来探索潜在的海滩行为的时间尺度，最佳拟合频率响应（天（-1））被显示为2004年后的数量级，表明相对微妙波迫使波的变化可以推动海岸线反应的重大变化。可用波数据的分析揭示了风暴季节性的统计上显着变化，从2005年之前的一年开始时主要发生在这次全年相对一致。从一种海岸线变异性的观察到的改变暗示海滩可以相对迅速地适应，以微妙地对波能量分布的变化。版权所有（c）2016 John Wiley＆Sons，Ltd。

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