In coastal aquifers the water level could be subjected to a sinusoidal fluctuations induced by oceanic tides. In that case the interpretation of pumping tests could be problematic. If anyone are involved in this kind of interpretation I would be glad to help by using the method described in the publication “Pumping test analysis in confined aquifers subjected to tidal fluctuations”. This automatic method provides the aquifers parameters and the characteristics of the fluctuation (amplitudes and time lags in relation to the oceanic tides). Data about the tide, prior or during the test, are not necessary in this method.
Hydraulic parameters of coastal aquifer systems by direct methods and an extended tide-aquifer interaction technique by Jha, M.K., Namgial, D., Kamii, Y. and Peiffer, S. Water Resources Management, 22(12): 1899-1923 (2008)
I think the PhD thesis of Prof. Jha was on the theme of your question.
http://www.iitkgp.ac.in/fac-profiles/showprofile.php?empcode=aadWU
Dear Pradeep Naik
Thanks for your response. However, the subject covered by Jha et al (2008) is completely different because it deals with the tide–aquifer interaction technique and not with pumping tests in coastal aquifers. This issue is the subject of the paper by Trefry MG, Johnston CD (1998)1, among others, but their approach is different from the contribution referred in my question, because in it the characteristics of the tidal effect must be known before the realization of the pumping test.
1“Pumping test analysis for a tidal forced aquifer”. Ground Water 36(3):427–433
Thanks for your interesting offer. I just wonder how would you eliminate the effect of tides on water level while conducting the test.
Dear Osman Abdalla,
You don’t need to eliminate the effect of tides on water level while conducting the test because the method described in the referred contribution uses raw data. The decomposition of the two effects (tide and pumping) will be made automatically by the program.
In the paper Warner, D. and Aulenbach, B.T. 1999, Hydraulic characteristics of the Upper Floridan Aquifer in the Savannah and St Marys areas of coastal Georgia. Atlanta, Georgia, Georgia Geologic Survey Information Circular 105, 23 pp. which is available at http://ga.water.usgs.gov/publications/other/ggs-ic105/pdf/ggs-ic105.pdf there is a section on Regression technique for removing tidal and pumping effects (p.21) that describes removing the effects of tides on the observation well using a lag.
You are right but in the method described in my contribution “Pumping test analysis in confined aquifers subjected to tidal fluctuations”, which can be downloaded from Researchgate, we don’t need to correct the raw data. On the contrary, the analysis of the raw data provides not only the aquifer parameters but also the characteristics of the sinusoidal fluctuation, that is, its amplitude and time-lag in relation to the fluctuation in the aquifer boundary. From this data the hydraulic diffusivity can also be estimated.
Here's a publication that may be relevant to this discussion: Halford, K., Garcia, C.A., Fenelon, J., and Mirus, B., 2012, Advanced methods for modeling water-levels and estimating drawdowns with SeriesSEE, an Excel add-In, U.S. Geological Survey Techniques and Methods 4–F4, 28 p. http://pubs.usgs.gov/tm/tm4-F4/
Thanks Andrew, I think that the method described in the paper is a powerfull tool.
I think I have a set of data that could be analysed with this method.
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