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Spectral decomposition of periodic ground water fluctuation in a coastal aquifer
Author(s) -
Shih David ChingFang,
Lin GwoFong,
Jia YeePing,
Chen YueGau,
Wu YihMin
Publication year - 2008
Publication title -
hydrological processes
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.222
H-Index - 161
eISSN - 1099-1085
pISSN - 0885-6087
DOI - 10.1002/hyp.6781
Subject(s) - seawater , groundwater , aquifer , spectral analysis , environmental science , lag , water level , atmospheric pressure , hydrology (agriculture) , seawater intrusion , decomposition , atmospheric sciences , geology , oceanography , geotechnical engineering , chemistry , physics , geography , computer network , cartography , organic chemistry , quantum mechanics , spectroscopy , computer science
This research accomplished by the descriptive statistics and spectral analysis of six kinds of time series data gives a complete assessment of periodic fluctuation in significant constituents for the Huakang Shan earthquake monitoring site. Spectral analysis and bandpass filtering techniques are demonstrated to accurately analyse the significant component. Variation in relative ground water heads with a period of 12·6 h is found to be highly related to seawater level fluctuation. Time lag is estimated about 3·78 h. Based on these phenomena, the coastal aquifer formed in an unconsolidated formation can be affected by the nearby seawater body for the semi‐diurnal component. Fluctuation in piezometric heads is found to correspond at a rate of 1000 m h −1 . Atmospheric pressure presents the significant components at periods of 10·8 h and 7·2 h in a quite different type, compared to relative ground water head and seawater level. Copyright © 2008 John Wiley & Sons, Ltd.