基于小波分析的水位观测气压效应研究

为研究水位气压效应的主要特征, 采用广西南宁石埠、 九塘两个台站的水位、 气压观测资料, 利用小波分析、 交叉小波分析、 小波相干分析方法在时间-频率空间内对二者的周期特征以及二者的相关特征进行了分析。 结果表明: 水位观测数据的显著周期为7.8~14.7 h, 气压观测数据的显著周期为7.8~14.7 h和17.5~27.8 h; 水位和气压存在7.8~14.7 h尺度的共振周期; 水位和气压在较宽的周期尺度上存在着显著的相关性, 且水位和气压的相关系数随周期和时间变化, 二者的相对相位角也因周期的不同而存在差异。

Wavelet Analysis of Barometric Pressure Effects on Groundwater Level

To investigate the main characteristics of the barometric pressure effects on groundwater level, we use groundwater level data and barometric pressure data in Nanning Shibu and Nanning Jiutang station to reveal period characteristics of both as well as their relations in time-frequency space by wavelet analysis, cross wavelet and wavelet coherence. Wavelet power spectrum shows that period band between 7.8 and 14.7 hours is the same significant period band for both groundwater level and barometric pressure. Another significant period band of barometric pressure is between 17.5 and 27.8 hours. Cross wavelet analysis indicates that the resonant period of groundwater level and barometric pressure is between 7.8 and 14.7 hours. The results of the wavelet coherence analysis show that groundwater level and barometric pressure have significant correlation in a wider period band, and the correlation coefficient of groundwater level and barometric pressure changes over period and time, and their relative phase angle also show differences due to difference of cycle.