基于EEMD-HHT的近岸冲流带波浪非线性波动特征分析

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (21) : 68-77.

论文

邓斌 1,2,3，蒋昌波 1,2,3，李志威 1,2,3，刘晓建 1

作者信息 +

Characteristics analysis of wave hydrodynamics in coastal swash zone based on EEMD-HHT method

DENG Bin 1,2,3 JIANG Changbo 1,2,3 LI Zhiwei 1,2,3 LIU Xiaojian 1

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文章历史 +

摘要

冲流带复杂水流运动特性是研究近岸带物质输运的关键，其中波要素的历时变化具有非平稳性、非对称性和多尺度变化等复杂非线性波动特性，分析其作用周期及趋势规律，对认识冲流带的复杂水沙动力过程至关重要。基于溃坝原理产生涌波，采用水槽实验对涌波作用下不同坡度下冲流带波浪非线性波动特征开展研究。结合EEMD和HHT方法对实验波要素数据进行统计分析，得出波浪归一化能量谱、边际谱和边际能量谱，并结合功率谱密度分析水体波动对岸滩作用的影响。结果表明，冲流带的波浪波能主要集中在低频处，约低于1 Hz。在本文3种实验工况下，沿着岸滩向岸方向冲流带断面最大瞬时能量会逐渐衰减，当水流分别作用2~3 s、3~5 s和3~6 s时接近波浪最大瞬时能量，对岸滩作用达到最大；岸滩坡度越陡，最大瞬时能量值出现的时间越早，对床面的作用越大。

Abstract

The characteristics of complex water flow in the swash zone are the key to the study of material transport in the nearshore zone, in which the diachronic variation of wave elements has complex nonlinear wave characteristics of non-stationarity, asymmetry and multi-scale variation, and so on.The action period and trend law of the wave element were analyzed, it is very important in order to understand the complex dynamic process of water and sediment in the swash zone.Based on the dam-break principle, a flume experiment was carried out to study the nonlinear wave characteristics of the scour current belt under the action of the surge wave with different slope.EEMD and HHT methods were used to analyze the experimental wave data, and the normalized wave energy spectrum, marginal energy spectrum and marginal energy spectrum were obtained, and the influence of water fluctuation on shoreline was analyzed with power spectral density.The results show that the wave energy of the current zone is mainly concentrated at the low frequency, which is lower than 1 Hz.Under the three experimental conditions, the maximum instantaneous energy gradually decrease along the shoreline direction.The maximum instantaneous energy appears and the currents have the strongest effects on shoreline, when the currents act on the shoreline for 2-3 s, 3-5 s and 3-6 s respectively.The steeper the slope of the beach is, the earlier the maximum instantaneous energy value appears, the greater the effect on the beach surface is.

导出引用

邓斌 1,2,3，蒋昌波 1,2,3，李志威 1,2,3，刘晓建 1. 基于EEMD-HHT的近岸冲流带波浪非线性波动特征分析[J]. 振动与冲击, 2018, 37(21): 68-77

DENG Bin 1,2,3 JIANG Changbo 1,2,3 LI Zhiwei 1,2,3 LIU Xiaojian 1. Characteristics analysis of wave hydrodynamics in coastal swash zone based on EEMD-HHT method[J]. Journal of Vibration and Shock, 2018, 37(21): 68-77

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