Short wave attenuation by a kelp forest canopy

IF 5.1 2区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2024-05-10 DOI:10.1002/lol2.10401
M. Lindhart, M. A. Daly, H. Walker, I. B. Arzeno-Soltero, J. Z. Yin, T. W. Bell, S. G. Monismith, G. Pawlak, J. J. Leichter
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Abstract

Giant kelp (Macrocystis pyrifera) forests are common along the California coast. Attached on the rocky bottom at depths of approximately 5–25 m, the kelp, when mature, spans the water column and develops dense, buoyant canopies that interact with waves and currents. We present two novel results based on observations of surface gravity waves in a kelp forest in Point Loma, California. First, we report short wave (1–3 s) attenuation in kelp, quantified by an exponential decay coefficient α O 10 3 m 1 —comparable to the dampening effect of sea ice. Second, we identify seasonal and tidal changes in attenuation, peaking mid-summer with maximum kelp cover, and during low tide when a greater proportion of the fronds are at the surface. Thus, the naturally occurring surface canopies of kelp forests can act as temporally varying, high-frequency filters of wave energy.

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海藻林冠层对短波的衰减
巨型海带(Macrocystis pyrifera)林在加利福尼亚海岸很常见。海带附着在水深约 5-25 米的岩石底部,成熟后会横跨水体,形成致密的浮力篷,与海浪和水流相互作用。我们根据对加利福尼亚州洛马角海藻林表面重力波的观测,提出了两项新成果。首先,我们报告了海带中的短波(1-3 秒)衰减,该衰减通过指数衰减系数量化,可与海冰的阻尼效应相媲美。其次,我们确定了衰减的季节性变化和潮汐变化,在海带覆盖率最高的仲夏和退潮时达到峰值,此时海带叶片的更大比例位于海面。因此,自然形成的海藻林表面树冠可以作为波浪能量的高频滤波器,在不同时间发挥作用。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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