Coastal mangroves, thriving at the interface between land and sea, provide robust flood risk reduction. Projected increases in the frequency and magnitude of climate impact drivers such as sea level rise and wind and wave climatology reinforce the need to optimize the design and functionality of coastal protection works to increase resilience. Doing so effectively requires a sound understanding of the local coastal system. However, data availability particularly at muddy coasts remains a pronounced problem. As such, this paper captures a unique dataset for the Guyana coastline and focuses on relations between vegetation (mangrove) density, wave attenuation rates and sediment characteristics. These processes were studied along a cross-shore transect with mangroves fringing the coastline of Guyana. The data are publicly available at the 4TU Centre for Research Data (4TU.ResearchData) via https://doi.org/10.4121/c.5715269 (Best et al., 2022) where the collection Advancing Resilience Measures for Vegetated Coastline (ARM4VEG), Guyana, comprises of six key datasets.Suspended sediment concentrations typically exceeded 1 g L⁻¹ with a maximum of 60 g L⁻¹, implying that we measured merely fluid-mud conditions across a 1 m depth. Time series of wind waves and fluid-mud density variations, recorded simultaneously with tide elevation and suspended sediment data, indicate that wave–fluid-mud interactions in the nearshore may be largely responsible for the accumulation of fine, muddy sediment along the coast. Sediment properties reveal a consolidated underlying bed layer. Vegetation coverage densities in the Avicennia-dominated forest were determined across the vertical with maximum values over the first 20 cm from the bed due to the roots and pneumatophores.Generalized total wave attenuation rates in the forest and along the mudflat were between 0.002–0.0032 m⁻¹ and 0.0003–0.0004 m⁻¹ respectively. Both the mangroves and the mudflats have a high wave-damping capacity. The wave attenuation in the mangroves is presumably dominated by energy losses due to vegetation drag, since wave attenuation due to bottom friction and viscous dissipation on the bare mudflats is significantly lower than wave dissipation inside the mangrove vegetation. Data collected corroborate the coastal defence function of mangroves by quantifying their contribution to wave attenuation and sediment trapping. The explicit linking of these properties to vegetation structure facilitates modelling studies investigating the mechanisms determining the coastal defence capacities of mangroves.

中文翻译：

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圭亚那潮间带泥滩的波浪衰减潜力、沉积物特性和红树林生长动态数据：评估红树林恢复工作的潜力

沿海红树林在陆地和海洋的交界处茁壮成长，可有效降低洪水风险。预计海平面上升和风浪气候学等气候影响驱动因素的频率和幅度会增加，这加强了优化沿海保护工程的设计和功能以提高复原力的必要性。要有效地做到这一点，需要对当地沿海系统有充分的了解。然而，特别是在泥泞海岸的数据可用性仍然是一个明显的问题。因此，本文捕获了圭亚那海岸线的独特数据集，重点关注植被（红树林）密度、波浪衰减率和沉积物特征之间的关系。这些过程是沿着圭亚那海岸线沿岸的红树林横断面研究的。^-1最大为 60 g L ^-1，这意味着我们仅测量了 1 m 深度的流体-泥浆条件。与潮汐高度和悬浮沉积物数据同时记录的风浪和流体 - 泥浆密度变化的时间序列表明，近岸的波浪 - 流体 - 泥浆相互作用可能是沿海细泥质沉积物积累的主要原因。沉积物特性揭示了一个巩固的底层床层。由于根和气孔， Avicennia占主导地位的森林中的植被覆盖密度在垂直方向上确定，最大值在距床的前 20 cm 内。森林和沿泥滩的广义总波衰减率在 0.002-0.0032 m 之间^-1和 0.0003–0.0004 m ^-1 分别。红树林和泥滩都具有很高的波浪阻尼能力。红树林中的波浪衰减可能主要是由于植被阻力引起的能量损失，因为底部摩擦和裸露泥滩上的粘性耗散引起的波浪衰减明显低于红树林植被内部的波浪耗散。收集的数据通过量化红树林对波浪衰减和沉积物捕获的贡献来证实红树林的海岸防御功能。这些特性与植被结构的明确联系有助于对确定红树林海岸防御能力的机制进行建模研究。