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Computational Modelling of the Impacts of Saltmarsh Management Interventions on Hydrodynamics of a Small Macro-Tidal Estuary
Journal of Marine Science and Engineering ( IF 2.7 ) Pub Date : 2020-05-23 , DOI: 10.3390/jmse8050373
William G. Bennett , Thomas J. van Veelen , Tom P. Fairchild , John N. Griffin , Harshinie Karunarathna

Saltmarshes are considered as natural coastal defences. However, owing to the large context dependency, there is much discussion over their effectiveness in providing coastal protection and the necessity of additional coastal defence interventions. The macro-tidal Taf Estuary in south-west Wales was chosen as the case study in this paper to investigate the effects of anthropogenic coastal defence interventions such as construction of hard defences, managed realignment, and altering land use of the saltmarshes on the complex hydrodynamics of the estuary. A coupled flow–wave–vegetation model, developed using the Delft3D coastal modelling software, was used. The wave and current attenuation role of saltmarshes during two contrasting storm conditions was modelled, with and without saltmarsh management interventions. The study reveals that certain saltmarsh management interventions can have widespread impacts on the hydrodynamics of the estuary. Altering the land use by allowing extensive grazing of saltmarsh by livestock was found to have the largest impact on wave attenuation, where wave heights on the marsh almost doubled when compared with the no-intervention scenario. On the other hand, managed realignment has a significant impact on tidal currents, where tidal currents reached 0.5 m/s at certain locations. Changes in estuarine hydrodynamics can lead to undesired impacts on flooding and erosion, which stresses the importance of understanding the effects of localized anthropogenic coastal management interventions on the entire estuarine system.

中文翻译:

盐沼管理干预对大型潮汐河口水动力影响的计算模型

盐沼被认为是天然的沿海防御。然而,由于对环境的依赖性很大,人们对其在提供沿海保护方面的效力以及是否有必要采取额外的沿海防御措施进行了很多讨论。本文以西南威尔士的大潮河口塔夫河口为例,研究人为沿海防御措施的影响,例如,建造防御工事,进行有管理的调整以及改变盐沼的土地利用对复杂水动力的影响。河口。使用了使用Delft3D海岸建模软件开发的流-波-植被耦合模型。在有和没有盐沼管理干预措施的情况下,对两种不同风暴条件下盐沼的波和电流衰减作用进行了建模。该研究表明,某些盐沼管理干预措施可能会对河口的水动力产生广泛的影响。人们发现,通过允许牲畜广泛放牧盐沼来改变土地利用方式对波浪衰减的影响最大,与无干预方案相比,沼泽上的波浪高度几乎翻了一番。另一方面,有管理的重新排列会对潮流产生重大影响,在某些位置,潮流达到0.5 m / s。河口水动力的变化可能导致对洪水和侵蚀的不良影响,这强调了了解局部人为沿海管理干预措施对整个河口系统的影响的重要性。人们发现,通过允许牲畜广泛放牧盐沼来改变土地利用方式对波浪衰减的影响最大,与无干预方案相比,沼泽上的波浪高度几乎翻了一番。另一方面,有管理的重新排列会对潮流产生重大影响,在某些位置,潮流达到0.5 m / s。河口水动力的变化可能导致对洪水和侵蚀的不良影响,这强调了了解局部人为沿海管理干预措施对整个河口系统的影响的重要性。人们发现,通过允许牲畜广泛放牧盐沼来改变土地利用方式对波浪衰减的影响最大,与无干预方案相比,沼泽上的波浪高度几乎翻了一番。另一方面,有管理的重新排列会对潮流产生重大影响,在某些位置,潮流达到0.5 m / s。河口水动力的变化可能导致对洪水和侵蚀的不良影响,这强调了了解局部人为沿海管理干预措施对整个河口系统的影响的重要性。受控的重新布置会对潮流产生重大影响,在某些位置,潮流达到0.5 m / s。河口水动力的变化可能导致对洪水和侵蚀的不良影响,这强调了了解局部人为沿海管理干预措施对整个河口系统的影响的重要性。受控的重新布置会对潮流产生重大影响,在某些位置,潮流达到0.5 m / s。河口水动力的变化可能导致对洪水和侵蚀的不良影响,这强调了了解局部人为沿海管理干预措施对整个河口系统的影响的重要性。
更新日期:2020-05-23
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