非线性多向波分离成入射波列和反射波列的NL-SORS方法

IF 4.5 2区 工程技术 Q1 ENGINEERING, CIVIL
Sarah Krogh Iversen, Mads Røge Eldrup, Thomas Lykke Andersen, Peter Frigaard
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引用次数: 0

摘要

在海岸结构物的设计过程中,经常进行物理模型试验。这种试验中的波浪气候通常包括短峰非线性波。结构响应与在结构前方测量到的入射波有关。现有的分离入射和反射短波峰波的方法是基于线性波理论的。对于非线性波的分析,现有的方法仅限于非线性长峰波的分离。对于短波峰波,迄今为止唯一的选择是在没有结构到位的情况下使用估计。因此,本文提出了一种新的非线性短峰波定向分析方法:非线性单求和斜反射分离(NL-SORS)。该方法在数值模型数据上得到了验证,对于该数据,目标明确,可以在完全吸收边界下进行模拟。利用二阶和三阶波动理论证明,如果假设双窄带方向谱,即主频和方向扩展函数必须是窄带的,则地表高程数学模型中非线性分量的速度误差很小。在倾斜的前滩上,波浪的非线性增加往往是由波浪的浅滩引起的,波浪的定向传播会因折射而减弱,因此在高度非线性的条件下不会经历广泛的定向传播函数。该方法成功地分解了非线性短峰波场,并估计了非线性短峰波场的方向谱。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The NL-SORS method for separation of nonlinear multidirectional waves into incident and reflected wave trains
Physical model tests are often conducted during the design process of coastal structures. The wave climate in such tests often include short-crested nonlinear waves. The structural response is related to the incident waves measured in front of the structure. Existing methods for separation of incident and reflected short-crested waves are based on linear wave theory. For analysis of nonlinear waves, the existing methods are limited to separation of nonlinear long-crested waves. For short-crested waves, the only options so far has been to use estimates without the structure in place. The present paper thus presents a novel method for directional analysis of nonlinear short-crested waves: Non-Linear Single-summation Oblique Reflection Separation (NL-SORS). The method is validated on numerical model data, as for such data, the target is well defined as simulations may be performed with fully absorbing boundaries. Second- and third-order wave theory is used to demonstrate that small errors on the celerity of nonlinear components in the mathematical model of the surface elevation can be obtained if a double narrow-banded directional spectrum is assumed, i.e. the primary frequency and the directional spreading function must be narrow banded. As the increasing nonlinearity of the waves often arise from waves shoaling on a sloping foreshore, the directional spreading of the waves will decrease due to refraction, and a broad directional spreading function will thus not be experienced in highly nonlinear conditions. The new NL-SORS method is shown to successfully decompose nonlinear short-crested wave fields and estimate the directional spectrum hereof.
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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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