Study on Threshold Selection Methods in Calculation of Ocean Environmental Design Parameters
Study on Threshold Selection Methods in Calculation of Ocean Environmental Design Parameters
复制标题
海洋环境设计参数计算阈值选择方法研究
DOI：
10.1109/access.2019.2906935
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发表时间：
2019-03
期刊：
影响因子：
3.9
通讯作者：
Kou Yi
中科院分区：
文献类型：
--
作者：
Liu Guilin;Gao Zhikang;Chen Baiyu;Fu Hanliang;Jiang Song;Wang Liping;Kou Yi
在海洋工程设计中，阈值的选取是对实测数据进行分析以及随后获取样本数据进行概率分析的一个基本且非常重要的环节。本文从时域和频域两个角度对阈值选取方法进行了深入研究，并给出了不同阈值下的计算结果。首先，利用平均剩余寿命图理论确定了杭州湾实测潮位的阈值。对于采用Gumbel分布计算的百年一遇设计值，<inline-formula><tex-math notation="LaTeX">阈值u=3.9$</tex-math></inline-formula>m下的结果比阈值<inline-formula><tex-math notation="LaTeX">u =3.75$</tex-math></inline-formula>m下的结果增加了1.70%，阈值<inline-formula><tex-math notation="LaTeX">u=3.75$</tex-math></inline-formula>m下的结果比阈值<inline-formula><tex-math notation="LaTeX">u=3.5$</tex-math></inline-formula>m下的结果增加了0.97%。阈值的定量选择方法简单实用，省去了基于经验阈值确定的多次试验的繁琐过程。此外，还首次将相干谱阈值引入到频率域，探讨了不同潮位序列间的显著相关性。基于WOSA法相干谱显著性检验中的阈值选取方法，给出了杭州湾不同潮位的相干谱阈值，有效避免了假峰的误识别。计算结果表明，当重叠率为50%，线段数为3，线段长度为16时，杭州湾极值潮位的振荡周期为21.3a。
In marine engineering design, the threshold selection is a basic and very important part for the analysis of measured data and subsequent acquisition of sample data for probability analysis. In this paper, threshold selection methods are deeply studied from the two perspectives of time domain and frequency domain, and the obtained calculation results with different thresholds are provided. First, the theory of mean residual life plot is used to quantify the threshold value of the measured tide levels of Hangzhou Bay. For the 100-year return periods design values calculated in the Gumbel distribution, the results under the threshold <inline-formula> <tex-math notation="LaTeX">$u=3.9$ </tex-math></inline-formula> m shows an increasing of 1.70% over those under the threshold <inline-formula> <tex-math notation="LaTeX">$u=3.75$ </tex-math></inline-formula> m; and the results under the threshold <inline-formula> <tex-math notation="LaTeX">$u=3.75$ </tex-math></inline-formula> m shows an increase of 0.97% over those under the threshold <inline-formula> <tex-math notation="LaTeX">$u=3.5$ </tex-math></inline-formula> m. The quantitative selection method of a threshold is simple and practical, and eliminates the tedious process of multiple trials based on empirical threshold determination. Besides, for the first time, the coherence spectrum threshold is used to explore the significant correlations of different tide level sequences in the frequency domain. Based on the threshold selection method used in the WOSA method-based coherence spectrum significance test, the coherence spectrum thresholds of different tide level in Hangzhou Bay are provided to effectively avoid the false identification of false peaks. It is suggested by the calculation results that, at the overlapping ratio of 50%, the segment number of three and the segment length of 16, and the spectral analysis shows that the extreme tide level of Hangzhou Bay has a vibration period of 21.3 years.
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