Response Characteristics of Water Level to Atmospheric Loading and Solid Earth Tide in Different Frequency Bands: A Case Study of the Shiquan Well, Shaanxi
Abstract The main objective of this research is to investigate the response characteristics of water level to atmospheric loading and solid Earth tide in different frequency bands in the Shiquan well, Shaanxi. Using the recorded water level, barometric pressure and the corresponding theoretical gravity tide from 1 November 2015 to 29 February 2016, we obtain the barometric and tidal responses of the water level by fast Fourier transform (FFT), coherence function, as well as cross-correlation. The results show that barometric response is relatively weak and fluctuates greatly, and the tidal response is extremely weak in low frequency band (f＜0.5 cpd); in the intermediate frequency band (0.5－8 cpd), tidal response is excellent; furthermore, the barometric responses are relatively strong at the frequency of K1, S2, and S3 waves, while the barometric and tidal responses are both relatively weak. The coherence functions between the water level and the barometric pressure are relatively low in high frequency (f＞8 cpd), reflecting a bad correlation between the two signals, which may be caused by the low signal-to-noise ratio in the water level and the relatively weak barometric signals. Moreover, the time lag of barometric response increases from 1 minute to 720 minutes with increasing periods of barometric pressure over all frequency bands. Lead effects and anomalous fluctuations appear in barometric response at some frequency points or ranges over medium-low frequency bands.
YANG Xiaolin,WEI Zigen. Response Characteristics of Water Level to Atmospheric Loading and Solid Earth Tide in Different Frequency Bands: A Case Study of the Shiquan Well, Shaanxi[J]. jgg, 2018, 38(10): 1096-1100.
YANG Xiaolin,WEI Zigen. Response Characteristics of Water Level to Atmospheric Loading and Solid Earth Tide in Different Frequency Bands: A Case Study of the Shiquan Well, Shaanxi[J]. jgg, 2018, 38(10): 1096-1100.
