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Characterization of an aquifer in Roorkee, India using the spatially constrained inversion of in‐loop TEM data
Author(s) -
von Papen M.,
Tezkan B.,
Israil M.
Publication year - 2013
Publication title -
near surface geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.639
H-Index - 39
eISSN - 1873-0604
pISSN - 1569-4445
DOI - 10.3997/1873-0604.2012011
Subject(s) - aquifer , hydrogeology , irrigation , geology , sewage , sewage farm , inversion (geology) , groundwater , hydrology (agriculture) , soil science , environmental science , geotechnical engineering , environmental engineering , seismology , sewage treatment , tectonics , ecology , sewage sludge treatment , biology
The study area is a sewage farm in Saliyar in the state of Uttarakhand, India, which is irrigated using untreated sewage from the nearby city of Roorkee. Previous studies showed that due to sewage irrigation the first unconfined aquifer at a depth of 5–15 m is contaminated. The aim of this study is to characterize the deeper aquifers to a depth of 100 m, underlying the first unconfined aquifer. Therefore 46 in‐loop TEM measurements were carried out in the farming area and an uncontami‐nated reference site with a transmitter loop of 50 x 50 m 2and receiver loops of 20 x 20 m 2and 5 x 5 m 2 . To benefit from the geologically expected one‐dimensional subsurface we applied the spatially constrained inversion technique on the data resulting in a geologically reasonable model and allowing the identification of a conducting layer of 28 Ωm as the second aquifer. The resolution of model parameters was computed using singular value decomposition. The low resistivity of the underlying aquifer, however, is not locally restricted to the sewage farm but is also visible in the reference area; it is therefore unlikely caused by irrigation with untreated sewage.