Exploring decadal beach profile dynamics in response to nourishment strategies under accelerated sea level rise

IF 4.8 2区 环境科学与生态学 Q1 OCEANOGRAPHY
Tosca Kettler , Matthieu de Schipper , Arjen Luijendijk
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引用次数: 0

Abstract

Accelerated sea level rise prompts the upscaling of nourishment strategies, either through larger individual nourishment volumes or increased frequency of implementation. In such strategies, the nourished sand may lack time to effectively redistribute in the designated timeframe, leading to significant deformation of the profile over multiple nourishment cycles. This study quantifies subsequent effects, focusing on profile steepening, nourishment lifetimes, and the feasibility of operational objectives. We simulated two common nourishment strategies at a Dutch case study location using the cross-shore morphological model Crocodile over a 50-year timespan under sea level rise rates of 2–32 mm/year. The choice of strategy led to a variation of up to 75% in the total amount of sand used. Our results show increasing profile deformation with nourishment volume applied and duration of the nourishment strategy, with sand accumulating in the nourished section and little dissipation to the lower shoreface. The consequent profile steepening leads to reduced nourishment lifetimes by up to 30%. Additionally, under high sea level rise rates, more erosive coasts experience a reduction in nourishment lifetimes to annual intervals, while less erosive areas require up to four times more sand than currently needed. These findings illustrate key dilemmas in the formulation of future nourishment strategies and highlight the importance of optimizing these strategies to account for sea level rise.
探索海平面加速上升条件下十年期海滩剖面动态变化对滋养战略的影响
海平面上升速度加快,促使通过扩大单个滋养量或增加实施频率来扩大滋养战略的规模。在这些策略中,被滋养的沙子可能没有时间在指定时间内有效地重新分布,从而导致剖面在多个滋养周期内发生显著变形。本研究对后续影响进行了量化,重点关注剖面陡化、滋养寿命以及操作目标的可行性。我们使用跨岸形态模型 Crocodile 在荷兰案例研究地点模拟了两种常见的滋养策略,在海平面上升率为 2-32 毫米/年的情况下,时间跨度为 50 年。策略的选择会导致用砂总量的变化,变化幅度可达 75%。我们的研究结果表明,剖面变形随着使用的滋养量和滋养策略持续时间的增加而增大,沙子在滋养段堆积,几乎没有消散到较低的岸面。随之而来的剖面陡峭化导致滋养寿命缩短达 30%。此外,在海平面上升率较高的情况下,侵蚀性较强的海岸的滋养寿命会缩短到每年一次,而侵蚀性较弱的地区所需的沙量是目前所需的四倍。这些研究结果说明了制定未来滋养战略的关键困境,并强调了优化这些战略以考虑海平面上升的重要性。
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来源期刊
Ocean & Coastal Management
Ocean & Coastal Management 环境科学-海洋学
CiteScore
8.50
自引率
15.20%
发文量
321
审稿时长
60 days
期刊介绍: Ocean & Coastal Management is the leading international journal dedicated to the study of all aspects of ocean and coastal management from the global to local levels. We publish rigorously peer-reviewed manuscripts from all disciplines, and inter-/trans-disciplinary and co-designed research, but all submissions must make clear the relevance to management and/or governance issues relevant to the sustainable development and conservation of oceans and coasts. Comparative studies (from sub-national to trans-national cases, and other management / policy arenas) are encouraged, as are studies that critically assess current management practices and governance approaches. Submissions involving robust analysis, development of theory, and improvement of management practice are especially welcome.
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