Coastal ecosystems are increasingly threatened by global change. Insight in their resilience against increased storminess is needed for their application in nature‐based coastal defense schemes. This is often gained from flume experiments. Laboratory flumes provide excellent hydrodynamic control, but are restrictive in that it is extremely difficult to experiment on ecosystems with a naturally developed stability. Field flumes resolve the latter, but are limited to unidirectional currents. This study introduces an easily deployable field flume that mimics the near‐bed water motion of waves: the Tidal Dynamics WAVE flume (the TiDyWAVE). The hydrodynamics of the TiDyWAVE are assessed and compared to natural waves. We also compare it with a more traditional unidirectional flow channel by measuring the erodibility (u_cr) of (1) bare sediments of which u_cr can be calculated and (2) a seagrass meadow. The TiDyWAVE can generate peak oscillatory currents up to 0.32 m s⁻¹ with a maximum wave period of 3.5 s, corresponding to 0.42 m high waves for a water depth of 3 m. u_cr measurements showed that bed shear stress in the TiDyWAVE mimics field waves well. In accordance with theory, the observed u_cr on bare sediment is consistently lower for oscillatory flow compared to unidirectional currents. On Thalassia testudinum, u_cr under unidirectional currents increases 3.5 times faster with increasing blade area than under oscillatory flow. The difference in hydrodynamic sheltering of the seabed by flexible vegetation under currents vs. waves emphasizes the need for imposing representative hydrodynamics to study hydrodynamic thresholds of coastal ecosystems.

中文翻译：

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介绍TiDyWAVE现场水槽：一种量化自然生态系统对未来暴风雨的抵御能力的方法

沿海生态系统正日益受到全球变化的威胁。将其应用于基于自然的沿海防御计划时，需要了解其抵御暴风雨的能力。这通常是通过水槽实验获得的。实验室水槽可提供出色的水动力控制，但存在局限性，因为很难在具有自然发展稳定性的生态系统上进行实验。场流解决了后者，但仅限于单向电流。这项研究引入了一种易于部署的现场水槽，该水槽模仿了波浪的近床水运动：潮汐动力学WAVE水槽（TiDyWAVE）。评估TiDyWAVE的流体动力学并将其与自然波进行比较。通过测量可蚀性，我们还将其与更传统的单向流道进行比较（u_CR）的其中的（1）裸沉积物ü _CR可以计算和（2）一种海草草地。TiDyWAVE可以产生高达0.32 m s ^-1的峰值振荡电流，最大波周期为3.5 s，对应于3 m水深的0.42 m高波。u _cr测量显示TiDyWAVE中的床层剪切应力很好地模拟了场波。根据理论，所观察到的û _CR上裸沉积物为振荡流始终降低相比单向电流。在Thalassia testudinum，ü _CR在单向电流作用下，叶片面积增加时，比在振荡流作用下增加3.5倍。在潮流与海浪作用下，柔性植被对海底的水动力遮盖力的差异强调了必须施加有代表性的水动力来研究沿海生态系统的水动力阈值。