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1、DETERMINATIONOFTHEGROUND-WATERLEVELBYMODERNNON-DISTRUCTIVEMETHODS(GPRTECHNOLOGY)1,21I.C.NICU,Gh.ROMANESCUABSTRACT.–Determinationoftheground-waterlevelbymodernnon-dis-tructivemethods(ground-penetratingradartechnology).GroundPenetratingRadar(GPR)isnowawell-acceptedgeophysicaltechnique,whichunf
2、ortunatelyinourcountryitslessused.Historically,thedevelopmentofGPRcomesfromtheuseofradioechosoundingtodetermineicethicknessanditwasonlyashortsteptoenlargethedomainofresearchsuchaspermafrost,geologicalinvestigation(bedrock,sedimentology),environmentalassessmentandhydrogeophysicalstudies(under
3、-groundwaterlocation,soilwatercontent).TheGPRmethodmeasuresthetraveltimeofelectromagneticimpulsesinsubsurfacematerials.Animpulseradarsystemradiatesrepetitiveelectromagneticimpulsesintothesoil.Abandwidthantennaisusuallyplacedincloseproximityandelectromagneticcoupledtothegroundsurface.Itdetect
4、sandmeasuresthedepthofreflectingdiscontinuitiesinsubsurfacesoilsandotherearthmaterialstowithinafewcentimetersdependingofantennafrequency.Forover30years,GPRhasbeenusedextensivelyforhydropedologicalinvestigations.Ourresearchaimstodeterminethegroundwatertoestimatethedegreeofevolutionofhydro-geo
5、morphologicalprocesses.Keywords:GroundPenetratingRadar(GPR),Ground-water,geophysics,hydro-geomorphologicalprocesses.1.INTRODUCTIONGroundPenetratingRadarmethod–GPRbelongstonondistructivegeophysics,basedonelectromagneticwavespropagationinsoil,rocksorotherinvestigationmediums(concreteetc.)(Cony
6、ers,2004).Theoriginalincentiveforitsdevelopmentwasforthearmy,whousedittodetectburriedminesandtunnels(Daniels,2004).Todayisawellknownmethodusedindifferentdomains:ñGeologicalinvestigation:detectingbedrock,sedimentology(DavisandAnnan,1989;BeresandHaeni,1991;Bristow,2003;Neal,2004);ñUtilitylocat
7、ing:electriclines,waterdrainslines,cableTVetc.(Al-Nuaimyetal.,2000;Lesteretal.,2007);1University„Al.I.Cuza”ofIasi,FacultyofGeographyandGeology,DepartmentofGeography,Bd.CarolI20A,700505,Iasi,Romania,Tel.0040-744774652,Fax.0040232-201481,e-mail.gelur
