Arnaud Le Pevedic , Paul Bayle , Alexandre Nicolae Lerma , Aldo Sottolichio , Florian Ganthy
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We perform a scenario analysis using different wind conditions and various maps of seagrass coverage (from 1989 to 2016) to provide new insights into how seasonality affects wind wave responses to <em>Zostera noltei</em> decline. Our results reveal that during the summer, when seagrasses are fully developed, seagrass decline significantly reduces the ability of <em>Z. noltei</em> to dissipate wave energy, leading to a wave height increase (reaching 30 %, for H<sub>m0</sub> between 0.05 m and 0.35 m) in the areas where seagrass coverage is most reduced. However, during the winter, when canopy height and density are low, no significant changes in wave dissipation are observed due to <em>Z. noltei</em> decline. This study also shows that modifications of the ambient current within the canopy further decreases the capacity of <em>Z. noltei</em> to attenuate waves, as the intensification of flow conditions due to seagrass decline reduces canopy height.</div></div>","PeriodicalId":50996,"journal":{"name":"Coastal Engineering","volume":"201 ","pages":"Article 104796"},"PeriodicalIF":4.5000,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Numerical investigation of seasonal wind-wave responses to severe seagrass decline in a coastal lagoon\",\"authors\":\"Arnaud Le Pevedic , Paul Bayle , Alexandre Nicolae Lerma , Aldo Sottolichio , Florian Ganthy\",\"doi\":\"10.1016/j.coastaleng.2025.104796\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The intensification of environmental stressors and anthropogenic pressures has resulted in significant seagrass loss worldwide, reducing the capacity of vegetation to damp hydrodynamic energy. While the broad-scale impact of seagrass decline on wind waves has been partially investigated in coastal lagoons, the role of seasonal variations in seagrass characteristics in influencing these responses remains not fully understood. We propose to explore the seagrass-wave interaction through the implementation of a novel coupled wave-flow-vegetation model, which considers deflected canopy height in WAVEWATCH-III, and applied to the Arcachon lagoon. We perform a scenario analysis using different wind conditions and various maps of seagrass coverage (from 1989 to 2016) to provide new insights into how seasonality affects wind wave responses to <em>Zostera noltei</em> decline. 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引用次数: 0
摘要
随着环境压力和人为压力的加剧,世界范围内的海草数量急剧减少,植被对水动力能的吸收能力下降。虽然在沿海泻湖中已经部分调查了海草减少对风浪的广泛影响,但海草特征的季节变化在影响这些响应中的作用仍未完全了解。我们建议通过WAVEWATCH-III中考虑冠层高度偏转的波浪-流-植被耦合模型的实现来探索海草-波的相互作用,并将其应用于Arcachon泻湖。我们使用不同的风力条件和各种海草覆盖地图(1989年至2016年)进行情景分析,以提供关于季节性如何影响风波对褐藻下降的响应的新见解。结果表明,在夏季海草发育充分时,海草的减少显著降低了Z. noltei耗散波浪能量的能力,导致海草覆盖最减少的地区的波高增加30% (Hm0在0.05 m ~ 0.35 m之间)。然而,在冠层高度和密度较低的冬季,由于Z. noltei的下降,波的耗散没有明显的变化。该研究还表明,由于海草退化导致的水流条件加剧,导致冠层高度降低,冠层内环境水流的变化进一步降低了Z. noltei对波浪的衰减能力。
Numerical investigation of seasonal wind-wave responses to severe seagrass decline in a coastal lagoon
The intensification of environmental stressors and anthropogenic pressures has resulted in significant seagrass loss worldwide, reducing the capacity of vegetation to damp hydrodynamic energy. While the broad-scale impact of seagrass decline on wind waves has been partially investigated in coastal lagoons, the role of seasonal variations in seagrass characteristics in influencing these responses remains not fully understood. We propose to explore the seagrass-wave interaction through the implementation of a novel coupled wave-flow-vegetation model, which considers deflected canopy height in WAVEWATCH-III, and applied to the Arcachon lagoon. We perform a scenario analysis using different wind conditions and various maps of seagrass coverage (from 1989 to 2016) to provide new insights into how seasonality affects wind wave responses to Zostera noltei decline. Our results reveal that during the summer, when seagrasses are fully developed, seagrass decline significantly reduces the ability of Z. noltei to dissipate wave energy, leading to a wave height increase (reaching 30 %, for Hm0 between 0.05 m and 0.35 m) in the areas where seagrass coverage is most reduced. However, during the winter, when canopy height and density are low, no significant changes in wave dissipation are observed due to Z. noltei decline. This study also shows that modifications of the ambient current within the canopy further decreases the capacity of Z. noltei to attenuate waves, as the intensification of flow conditions due to seagrass decline reduces canopy height.
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.