HyWaThy: Hybrid modeling of nearshore Waves with different baThymetric states

IF 4.5 2区 工程技术 Q1 ENGINEERING, CIVIL
Manuel Zornoza-Aguado, Beatriz Pérez-Díaz, Laura Cagigal, Sonia Castanedo, Fernando J. Méndez
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引用次数: 0

Abstract

Coastal areas such as sandy beaches are highly pressured environments by humans worldwide, as they provide a wide range of ecosystem services that directly benefit societies. The growing concentration of human settlements along these coasts arise the need for improved coastal management strategies, where a robust knowledge of nearshore processes is fundamental. Given the inherently dynamic nature of sandy beaches, advancing our knowledge of nearshore hydrodynamics requires accurate modeling of the complex interaction between bathymetry and waves: bathymetric features affect wave propagation towards the coast, while waves, in turn, reshape the seabed through longshore and cross-shore sediment transport. This study presents a methodological advancement beyond the dynamic downscaling of wave conditions over a static bathymetry by introducing a coupled hybrid metamodel that simulates nearshore waves while accounting for the different bathymetric states of the beach. For doing so, statistical methods and numerical models are combined in La Salvé beach (Spain) to capture the bathymetric configurations using Principal Component Analysis applied to field-surveyed data, as well as to propagate waves from a single offshore point to a two-dimensional nearshore domain. The phase-resolving, non-hydrostatic XBeach model is employed to simulate key physical processes in the surf zone, including refraction, shoaling, diffraction, reflection and breaking. Once trained, the coupled hybrid metamodel can reconstruct nearshore hydrodynamics –represented by spatial fields of significant wave height and mean wave direction— in a matter of seconds. The model performance is numerically validated, showing satisfactory accuracy for the study site.
HyWaThy:不同水深状态的近岸波混合模型
沿海地区,如沙滩,是世界范围内人类压力很大的环境,因为它们提供了广泛的生态系统服务,直接造福社会。人类住区日益集中在这些沿海地区,因此需要改进沿海管理战略,在这些战略中,对近岸过程的充分了解是必不可少的。考虑到沙滩固有的动力性质,提高我们对近岸流体动力学的认识需要对水深和波浪之间复杂的相互作用进行精确的建模:水深特征影响波浪向海岸的传播,而波浪反过来又通过海岸和跨海岸的沉积物运输重塑海床。本研究通过引入一个耦合混合元模型来模拟近岸波浪,同时考虑海滩的不同水深状态,提出了一种方法上的进步,超越了静态水深测量中波浪条件的动态降尺度。为此,将统计方法和数值模型结合起来,在La salvevel海滩(西班牙)使用应用于实地调查数据的主成分分析来捕获水深配置,并将波浪从单个近海点传播到二维近岸域。采用相位分辨非流体静力XBeach模型模拟了冲浪带的折射、浅滩、衍射、反射和破碎等关键物理过程。一旦训练,耦合混合元模型可以在几秒钟内重建近岸水动力-由显著波高和平均波向的空间场表示。数值验证了模型的性能,对研究现场显示了满意的精度。
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来源期刊
Coastal Engineering
Coastal Engineering 工程技术-工程:大洋
CiteScore
9.20
自引率
13.60%
发文量
0
审稿时长
3.5 months
期刊介绍: Coastal Engineering is an international medium for coastal engineers and scientists. Combining practical applications with modern technological and scientific approaches, such as mathematical and numerical modelling, laboratory and field observations and experiments, it publishes fundamental studies as well as case studies on the following aspects of coastal, harbour and offshore engineering: waves, currents and sediment transport; coastal, estuarine and offshore morphology; technical and functional design of coastal and harbour structures; morphological and environmental impact of coastal, harbour and offshore structures.
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