在一个温和倾斜的堰洲岛上,海滩地下水对海洋过程和雨水的响应:对海龟巢洪水的影响

IF 4.5 2区 工程技术 Q1 ENGINEERING, CIVIL
Jakob C. Christiaanse , José A.A. Antolínez , Christopher D. Marshall , Jens Figlus , Timothy M. Dellapenna , Ad J.H.M. Reniers
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引用次数: 0

摘要

海滩地下水动态在沿海生态系统功能中起着至关重要的作用,特别是在用于海龟等濒危物种筑巢的低洼海滩栖息地。孵卵的巢容易受到地下水位(GWT)以下长时间淹没的影响,因为洪水持续时间严重影响卵的生存能力。了解海洋过程和降雨如何驱动巢区GWT波动对于评估巢迁移策略和设计基于自然的解决方案以减轻巢淹至关重要。在这里,我们分析了次重力波、潮汐、风暴潮和降雨如何驱动德克萨斯州加尔维斯顿岛海滩GWT的短期波动(每小时到每周)。加尔维斯顿岛是沿墨西哥湾西北海岸的一个耗散的、温和倾斜的堰洲岛系统。通过对2023年野外观测数据的光谱分析,我们发现浪涌和降雨在筑巢区短期GWT响应中占主导地位,而高频波和潮汐信号则越来越受到陆地的抑制。为了便于分析,我们根据估计的波浪上升将观测到的水位分为地下水位、混合水位和淹没水位。一项洪水阈值分析显示,在整个后海岸,即使是最浅的巢穴,也会发生多次长期的巢穴淹没事件(超过12小时)。这强烈表明加尔维斯顿岛的海滩目前不适合海龟筑巢,强调有必要继续进行正在进行的巢搬迁计划,并进一步研究基于自然的解决方案,使海龟能够筑巢(例如,海龟友好的营养)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Beach groundwater response to ocean processes and rain on a mild-sloping barrier island: Implications for sea turtle nest flooding
Beach groundwater dynamics play a critical role in coastal ecosystem functions, particularly in low-lying beach habitats used for nesting by endangered species like sea turtles. Incubating nests are susceptible to prolonged inundation below the groundwater table (GWT), as flooding duration critically affects egg viability. Understanding how oceanic processes and rain drive GWT fluctuations in the nesting area is essential for evaluating nest relocation strategies and designing nature-based solutions that mitigate nest flooding. Here, we analyze how infragravity waves, tides, storm surge, and rainfall drive short-term fluctuations (hourly to weekly) in the beach GWT on Galveston Island, Texas—a dissipative, mild-sloping barrier island system along the northwestern Gulf of Mexico coast. Applying tailored spectral analyses to field observations collected in 2023, we show that surge and rainfall dominate short-term GWT response in the nesting area, while higher-frequency wave and tidal signals are increasingly damped landward. To facilitate this analysis, we classify observed water levels into groundwater, mixed, and submerged regimes based on estimated wave runup. A flooding threshold analysis reveals multiple, prolonged nest inundation events (exceeding 12 h) across the backshore, even for the shallowest nests. This strongly suggests that Galveston Island’s beaches are currently unsuitable for turtle nesting, underscoring the need to continue the ongoing nest relocation program and further research nature-based solutions that enable sea turtle nesting (e.g., turtle-friendly nourishments).
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来源期刊
Coastal Engineering
Coastal Engineering 工程技术-工程:大洋
CiteScore
9.20
自引率
13.60%
发文量
0
审稿时长
3.5 months
期刊介绍: Coastal Engineering is an international medium for coastal engineers and scientists. Combining practical applications with modern technological and scientific approaches, such as mathematical and numerical modelling, laboratory and field observations and experiments, it publishes fundamental studies as well as case studies on the following aspects of coastal, harbour and offshore engineering: waves, currents and sediment transport; coastal, estuarine and offshore morphology; technical and functional design of coastal and harbour structures; morphological and environmental impact of coastal, harbour and offshore structures.
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