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Heterogeneous hydraulic properties of an insular aquifer clarified by a tidal response method with simple decomposition techniques

Item

Title (Dublin Core)

Heterogeneous hydraulic properties of an insular aquifer clarified by a tidal response method with simple decomposition techniques

Description (Dublin Core)

<p>Two simple frequency decomposition techniques were used as part of a tidal response method to derive the hydraulic diffusivities of a freshwater-lens aquifer. Digital high-pass filtering can separate the tidal components of diurnal and shorter periods from longer-period components. Discrete Fourier transform can be used to isolate a specific tidal component. These techniques are easy to practice using the built-in functions of spreadsheet software. The applied techniques were each optimized for the frequencies of known major tidal components. Isolation of the specific tidal signals helps to reduce the errors of a basic tidal response method that uses in its calculations the amplitude attenuation and phase lag of a simple sinusoidal wave of groundwater fluctuations. Another advantage of the present tidal method is the utilization of two groundwater time series collected from near-shore and relatively inland sites affected by the same ocean tide. The method does not use surface-water observation, thus avoiding errors derived from generally possible surface-water/groundwater boundary effects.The tidal response method with simple decomposition techniques was used to investigate the aquifer properties of an uplifted limestone island located in a subtropical region of Japan. A freshwater lens is the principal water resource for this island and its sustainable development is desired. Significant hydraulic layering has not been reported in the limestone aquifer. Pairs of groundwater-level time-series data collected by simultaneous observations at near-shore and inland sites were analysed by the tidal response method. The results demonstrated heterogeneous aquifer diffusivity on the island, typically with larger values in the southeastern coastal part than in the northwestern coastal part, which is consistent with the planar distribution of the entire freshwater lens and the position of its maximum thickness that are slightly biased toward the northwestern side.</p>

Creator (Dublin Core)

Katsushi Shirahata
Shuhei Yoshimoto
Takeo Tsuchihara
Satoshi Ishida

Subject (Dublin Core)

freshwater-lens aquifer
nonrecursive digital filtering
discrete Fourier transform
tidal response method
hydraulic heterogeneity
Geology
QE1-996.5

Publisher (Dublin Core)

Croatian Geological Survey

Date (Dublin Core)

2018-06-01T00:00:00Z

Type (Dublin Core)

article

Identifier (Dublin Core)

1330-030X
1333-4875
10.4154/gc.2018.06
https://doaj.org/article/b346e64ff9724c59b4e599ce14440d7a

Source (Dublin Core)

Geologia Croatica, Vol 71, Iss 2, Pp 83-90 (2018)

Language (Dublin Core)

EN

Relation (Dublin Core)

http://www.geologia-croatica.hr/ojs/index.php/GC/article/view/849
https://doaj.org/toc/1330-030X
https://doaj.org/toc/1333-4875

Provenance (Dublin Core)

Journal Licence: CC BY