Laboratory study of the cross-hole resistivity tomography: The Model Stacking (MOST) Technique

Leontarakis, K; Apostolopoulos, GV

dc.contributor.author	Leontarakis, K	en
dc.contributor.author	Apostolopoulos, GV	en
dc.date.accessioned	2014-03-01T02:09:29Z
dc.date.available	2014-03-01T02:09:29Z
dc.date.issued	2012	en
dc.identifier.issn	09269851	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29846
dc.subject	Crosshole Electrical Resistivity Tomography	en
dc.subject	Data inversion	en
dc.subject	Laboratory study	en
dc.subject	Model improvement technique	en
dc.subject	Void detection	en
dc.subject.other	Data inversion	en
dc.subject.other	Detection ability	en
dc.subject.other	Electrical resistivity tomography	en
dc.subject.other	Electrode arrays	en
dc.subject.other	Half spaces	en
dc.subject.other	Half-space	en
dc.subject.other	Interpretation parameter	en
dc.subject.other	Laboratory studies	en
dc.subject.other	Laboratory study	en
dc.subject.other	Model experiments	en
dc.subject.other	Resistivity models	en
dc.subject.other	Resistivity tomography	en
dc.subject.other	Resolution quality	en
dc.subject.other	Small targets	en
dc.subject.other	Targets detection	en
dc.subject.other	Void detection	en
dc.subject.other	Experiments	en
dc.subject.other	Poles	en
dc.subject.other	borehole	en
dc.subject.other	data inversion	en
dc.subject.other	electrical resistivity	en
dc.subject.other	electrode	en
dc.subject.other	image resolution	en
dc.subject.other	numerical model	en
dc.subject.other	sensitivity analysis	en
dc.subject.other	tunnel	en
dc.title	Laboratory study of the cross-hole resistivity tomography: The Model Stacking (MOST) Technique	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jappgeo.2012.01.005	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jappgeo.2012.01.005	en
heal.publicationDate	2012	en
heal.abstract	Model experiments in the laboratory are used to find the optimal measuring and interpretation parameters that affect the quality of the results for the improved application of resistivity tomography between boreholes or between the surface and a tunnel. The experiments have shown that the detection ability of each crosshole electrode array is different and depends on the form of the sensitivity pattern. The bipole-bipole array, with current and potential pairs in different boreholes, has quite low signal and very good resolution of confined bodies in homogeneous half-spaces, but the resolution decreases as the half-space becomes more complex. The bipole-bipole array with the electrodes of each bipole in different boreholes produces a stronger signal, causing the models to be greatly influenced, even by the presence of small targets. However, the resolution quality is poor, mainly in the middle of the area between the boreholes. Pole-bipole array shows good resolution of the targets detection, but it is less accurate when conditions become noisier. The pole-tripole array has the best resolution, even when the environment becomes more complex or noisier, but the produced models have also many artifacts. The combined arrays' data inversion yields the greatest influence of the targets on resistivity models, usually with very good positioning or shape resolution, but with many more intense artifacts, since this method inevitably combines the advantages and disadvantages of each array. A new approach to improve the quality of resistivity models has been developed, based on a stacking technique, through the processing of different arrays' inverted models (""MOST"" technique). The improvement of the MOST models' quality has been measured, comparing each final resistivity model with the corresponding real one, highlighting this way the efficiency of this technique, in contrary to the combined arrays' data inversion. © 2012 Elsevier B.V..	en
heal.journalName	Journal of Applied Geophysics	en
dc.identifier.doi	10.1016/j.jappgeo.2012.01.005	en
dc.identifier.volume	80	en
dc.identifier.spage	67	en
dc.identifier.epage	82	en