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首页> 外文期刊>Estuarine Coastal and Shelf Science >Tradeoffs among hydrodynamics, sediment fluxes and vegetation community in the Virginia Coast Reserve, USA
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Tradeoffs among hydrodynamics, sediment fluxes and vegetation community in the Virginia Coast Reserve, USA

机译：美国弗吉尼亚海岸保护区的水动力，泥沙通量和植被群落之间的权衡

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摘要

Both submerged and emergent vegetation plays a fundamental role in coastal bays. Vegetation stabilizes the substrate, increasing resilience to storms. Vegetation also traps sediments favoring accretion and therefore counteracting sea level rise. Previous modeling studies on flow-vegetation-sediment interactions have focused on one specific vegetated community, but we lack a general understanding of the synergistic effects of multiple vegetation species. We focus our study on the Virginia Coast Reserve Long Term Ecological Research (LTER) site, USA, where we apply numerical modeling (Delft3D-SWAN) to investigate the independent and synergistic effects of salt marsh vegetation and seagrass. Our numerical results show that salt marshes and seagrass beds reduce the volume of water entering and exiting the shallow coastal bays up to 15% during each tidal cycle. Vegetation also reduces bed shear stress and hence increases sediment deposition in the bay and marshes up to 10% compared to the no-vegetated case. Our study shows the double benefits of seagrass as an ally of salt marsh in promoting bays resilience. On the one hand, seagrass helps the salt marsh to survive during storms by reducing wave energy; on the other hand, seagrass generates more friction in subtidal parts of the bay where salt marsh cannot survive.
机译：淹没植被和新兴植被在沿海海湾中都起着根本性的作用。植被稳定了基质，增强了抵御风暴的能力。植被还捕获有利于增加的沉积物，因此可以抵消海平面的上升。以前关于流-水-沙相互作用的模型研究集中在一个特定的植被群落上，但是我们对多种植被物种的协同效应缺乏普遍的了解。我们将研究重点放在美国弗吉尼亚海岸保护区长期生态研究（LTER）站点上，我们在该站点上应用数值模型（Delft3D-SWAN）研究盐沼植被和海草的独立和协同效应。我们的数值结果表明，在每个潮汐周期中，盐沼和海草床可将流入和流出浅海沿海海湾的水量减少多达15％。与没有植被的情况相比，植被还减少了床切应力，因此增加了海湾和沼泽中的沉积物沉积。我们的研究表明，作为盐沼的盟友，海草在提高海湾韧性方面具有双重优势。一方面，海草通过减少波能来帮助盐沼在暴风雨中生存。另一方面，海草在海湾的潮间带产生更大的摩擦，盐沼无法生存。

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