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| Titel |
Estimations of tidal characteristics and aquifer parameters via tide-induced head changes in coastal observation wells |
| VerfasserIn |
Y.-J. Chen, G.-Y. Chen, H.-D. Yeh, D.-S. Jeng |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 15, no. 5 ; Nr. 15, no. 5 (2011-05-13), S.1473-1482 |
| Datensatznummer |
250012782
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| Publikation (Nr.) |
 copernicus.org/hess-15-1473-2011.pdf |
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| Zusammenfassung |
| The groundwater fluctuations due to tidal variations at an observation well
in a coastal aquifer can be used to determine the tidal characteristics and
aquifer parameters without conducting an aquifer test. In this study, a
method, comprised of Jeng et al.'s solution (2005) and simulated annealing
(SA) algorithm, is developed to determine the coastal aquifer parameters
(hydraulic diffusivity, beach slope, and aquifer thickness) as well as the
tidal characteristics (bichromatic-tide amplitudes, bichromatic-tide wave
frequencies, and tidal phase lag) from the analysis of the tide-induced
well-water-level (WWL) data. The synthetic WWL data generated from Jeng et
al.'s solution (2005) with assumed parameter values and field data obtained
from Barrenjoey beach, Australia, are analyzed. The estimated parameter
values obtained from analyzing synthetic WWL data by the present method show
good agreements with the previously assumed parameter values. The parameter
estimation procedure may however fail in the case of a large shallow water
parameter which in fact violates the constraint on the use of Jeng et al.'s
solution (2005). In the analysis of field WWL data, the results indicate
that the aquifer parameters estimated from the present method with single or
multiple well data are significantly different from those given in Nielsen (1990). Inspecting the observed WWL data and the WWL data predicted from
Jeng et al.'s solution (2005) reveals that the present method may provide
better estimations for the aquifer parameters than those given in Nielsen (1990). |
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