Geophysical investigation of underground water content zones using electrical resistivity tomography and ground penetrating radar: A case study in Hesarak-Karaj, Iran

摘要: Abstract This paper describes the successful application of an integrated geophysical survey to investigate depth underground water table and location probable cavity occurrences at a developing residential area design foundation under constructing urban buildings located Hesarak-Karaj, Alborz province Iran. The shallow non-invasive consists Electrical Resistivity Tomography (ERT) Ground Penetrating Radar (GPR). These methods could appropriately indicate existence approximately 12 m while processed GPR radargrams localized no in studied site. A 100-MHz shielded antenna has been used conduct high resolution subsurface order delineate cavities area, two electrical arrays gradient Wenner have as well image resistivity variations layers especially for prospecting saturated zone. acquired results which were good accordance with reality locating effectively provide guidance builders tackle flow issue not concern about filling during any building