SPECTRAL ANALYSIS OF TIDAL FLUCTUATIONS IN GROUND WATER LEVEL

Water level data at 16 ground water wells and two sea water gauging stations, coupled with barometric measurements in an alluvial plain in the central-west region of Taiwan, are analyzed using spectral analysis in the time and frequency domains. The semi-diurnal component from water level station is...

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Bibliographic Details
Published in:Journal of the American Water Resources Association 2000-10, Vol.36 (5), p.1087-1099
Main Authors: Shih, David Ching-Fang, Lee, Chin-Dee, Chiou, Kin-Forie, Tsai, Shi-Ming
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
ground water
Hydrogeology
Hydrology. Hydrogeology
spectral analysis
Taiwan
tide
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Summary:Water level data at 16 ground water wells and two sea water gauging stations, coupled with barometric measurements in an alluvial plain in the central-west region of Taiwan, are analyzed using spectral analysis in the time and frequency domains. The semi-diurnal component from water level station is observed to be the most noticeable signal while the diurnal component is the less distinct signal recorded at the water level stations. Both semi-diurnal and diurnal components are coupled with atmospheric pressure measurements. From the atmospheric pressure data, spectral analysis indicates that both the raw and the pressure adjusted water levels are almost in phase and retain the same amplitude in this area. It implies that the effect of pressure variations is not significant for the sea water and ground water level nearby; the astronomical tidal components, as expected, are the main factor causing fluctuation of ocean water and ground water levels in the Choshuihsi alluvial plain.
ISSN:1093-474X
1752-1688
DOI:10.1111/j.1752-1688.2000.tb05712.x