基于改进Serre-Green-Naghdi方程的近岸波浪变换、破碎和堤岸过顶数值模拟

IF 4.5 2区 工程技术 Q1 ENGINEERING, CIVIL
Guillaume Coulaud , Maria Teles , Michel Benoit
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引用次数: 0

摘要

在给定风暴条件下允许的平均溢水流量通常用于设计海岸保护,特别是堤防或防波堤。这些流量通常使用半经验公式来估计,该公式依赖于结构趾部的波浪条件。不幸的是,这些公式只适用于简单的配置,岸线不变,对于复杂的海况可能不够。因此,数值模拟可能是估计这些排放的更灵活的替代方法。这项工作提出了一个求解全非线性弱色散增强Serre-Green-Naghdi方程的boussinesq型数值模型的发展和验证,该模型用于在一个水平维度上模拟不透水结构上的随机波过顶。波浪破碎采用基于湍流动能的涡流黏度方法进行建模,该方法在描述海浪区能量耗散方面具有鲁棒性和准确性。两个不同的实验数据集,共184次试验,波浪条件和前海岸海底剖面非常不同,用于验证波浪传播,浅滩,破碎和溢出的模型。考虑了单峰海况和双峰海况。模型很好地再现了深前滩和极浅前滩构型以及破碎波和非破碎波的平均过顶流量。例如,与测量值相比,模拟的平均溢出率的典型平均相对误差在±20%以内,至少对于所考虑的运动的最大排放。对于较低的放电,模拟放电的散射值略高,但结果仍在可接受的范围内。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical modelling of nearshore wave transformation, breaking and overtopping of coastal protections with the enhanced Serre–Green–Naghdi equations
Admissible average overtopping discharges in given storm conditions are typically used to design coastal protections, in particular dykes or breakwaters. These discharges are usually estimated using semi-empirical formulas relying on wave conditions at the toe of the structure. These formulas, unfortunately, only work for simple configurations, invariant alongshore, and can be insufficient for complex sea states. Therefore, numerical modelling could be a more flexible alternative for estimating these discharges. This work presents the development and validation of a Boussinesq-type numerical model solving the fully-nonlinear weakly-dispersive enhanced Serre–Green–Naghdi equations for the simulation of random wave overtopping over impermeable structures in one horizontal dimension. Wave breaking is modelled with an eddy viscosity approach based on the turbulent kinetic energy, which is robust and accurate at describing energy dissipation in the surf zone. Two distinct experimental datasets, with 184 trials in total and very dissimilar wave conditions and foreshore seabed profiles, are used to validate the model regarding wave propagation, shoaling, breaking and overtopping. Both unimodal and bimodal sea states are considered. Average overtopping discharges in configurations with deep and very shallow foreshores, as well as for breaking and non-breaking waves, are well reproduced by the model. For instance, typical mean relative errors on the simulated mean overtopping rates are found to lie within ±20% compared with the measurements, at least for the largest discharges of the considered campaigns. The scatter of simulated discharges is somewhat higher for lower discharges, but the results remain in an acceptable range.
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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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