A Quantitative Assessment of the Annual Contribution of Platform Downwearing to Beach Sediment Budget: Happisburgh, England, UK
A Quantitative Assessment of the Annual Contribution of Platform Downwearing to Beach Sediment Budget: Happisburgh, England, UK
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平台磨损对海滩沉积物预算的年度贡献的定量评估：英国英格兰哈皮斯堡
DOI：
10.3390/jmse6040113
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发表时间：
2018
影响因子：
2.9
通讯作者：
Jonathan R. Lee
中科院分区：
文献类型：
--
作者：
A. Payo;M. Walkden;M. Ellis;A. Barkwith;D. Favis;H. Kessler;Benjamin Wood;H. Burke;Jonathan R. Lee
在英国东海岸哈皮斯堡进行的实地和数值调查，试图确定海滩厚度的特征，并确定控制海岸变化的地质框架。在海岸保护基础设施发生重大故障后，哈比斯堡悬崖海岸线沿线约1公里的海岸防御工事被拆除，引发了长达20年的约140米的快速侵蚀期。以前的敏感性研究表明，海滩厚度在海岸衰退中起着主要作用。然而，由于缺乏海滩容量数据，这些研究受到了限制。在这项研究中，我们结合了我们对该地区第四纪地质的认识，一种新的非侵入性被动地震勘探方法，以及一种新的地下震源和可运输物质的3D表示，以探索海滩厚度对悬崖和固结平台背面磨损和破坏的作用。结果表明，海滩厚度沿研究地点是不均匀的：我们估计，平台下沉对近岸沉积物收支的贡献与海滩流失的沉积物具有类似的数量级，因此不可忽略。我们已经提供了一系列证据来支持这样的观点，即哈比斯堡海滩是一个相对较薄的层，坐落在一个沉积丰富的砂砾平台上。这一概念与以前的出版物不同，以前的出版物假设平台主要是精致的材料。这对该海岸线的区域泥沙管理具有直接的意义。本研究有助于我们了解沿海沉积物预算的一个鲜为人知的方面，并概述了一种量化方法，使我们能够将地质理解简单地结合到全世界的海岸线演变评估中。
Field and numerical investigations at Happisburgh, East coast of England, UK, sought to characterize beach thickness and determine geologic framework controls on coastal change. After a major failure of coastal protection infrastructure, removal of about 1 km of coastal defence along the otherwise protected cliffed coastline of Happisburgh triggered a period of rapid erosion over 20 years of ca. 140 m. Previous sensitivity studies suggest that beach thickness plays a major role in coastal recession. These studies were limited, however, by a lack of beach volume data. In this study, we have integrated the insights gained from our understanding of the Quaternary geology of the area, a novel non-intrusive passive seismic survey method, and a 3D novel representation of the subsurface source and transportable material into a coastal modelling environment to explore the role of beach thickness on the back wearing and downwearing of the cliffs and consolidated platform, respectively. Results show that beach thickness is non-homogeneous along the study site: we estimate that the contribution to near-shore sediment budget via platform downwearing is of a similar order of magnitude as sediment lost from the beach and therefore non-negligible. We have provided a range of evidence to support the idea that the Happisburgh beach is a relatively thin layer perched on a sediment rich platform of sand and gravel. This conceptualization differs from previous publications, which assume that the platform was mostly till and fine material. This has direct implication on regional sediment management along this coastline. The present study contributes to our understanding of a poorly known aspect of coastal sediment budgeting and outlines a quantitative approach that allows for simple integration of geological understanding for coastline evolution assessments worldwide.
海岸建模环境 1.0 版：集成特定地形组件模型的框架，以模拟复杂海岸的十年至百年形态变化
影响因子：
5.1
作者：
Payo A
通讯作者：
Payo A