I measure a ground water level using VES method in 2003 and then compare it using the same method in 2010. Is this method capable for monitoring ground water level? please suggest any additional method or data?
Yes, VES seems to be a practical method regarding corresponding errors: http://www.landviser.net/webfm_send/20
Yes, you can have an idea ( especially in high variations of underground water level) but not an exact estimation of water level depth. An correlation with a drill hole is needed to extend after in wider area.
I think, yes. I am sure that the method should work. But I'm theorist, so my opinion may be too optimistic.
Anatol Guglielmi
PS: I would like to inform you about my recent paper on the geoelectrics (please, see the attached file).
YES you can monitor groundwater level with VES and you can make some good maps by taking point data .
Sometimes, I would say that best chances are In unconsolidated open aquifers with coarse grain size, e.g. gravel or coarse sands. There the capillary fringe is small.
@all, thank you for all valuable answer. It makes me sure to write it on paper. Otherwise I am loooking for additional data from well.
It would be great if I have a reference paper which is use of VES in monitoring ground water.
Best.
Yes, it could be, but you should do it in certain periods to compare the results, if you have just some validation boreholes it would be great.
This theoretically can be done but should be performed on relatively flat and spread deposits to remain as far as possible close to the 1D assumption...
Dr. Gance, thank for answer. I did it in a relatively flat city, which is diferences of height about 2 meter in area 7 by 7 km.
Best
I think that the comparison process will not be accurate because of what we call the signal to anomaly ratio as the amount of change in the value of the measured electrical resistivity of the rocks can be compared by the largest change due to differences in ground water level . But if there was some wells were measured the ground water level during 2003 and 2010, and these measurements were taken as references during the interpretations of Soundings, In this case, the process is positive .
Dear Sorja,
How deep is your groundwater level? if you refer to a shallow water table VES would not work satisfactorily due to the averaging nature of the apparent resistivity that is measured. Deeper GW level is even more difficult to deal with. In fact nowadays VES is less and less used as people would prefer applying the electric imaging method.
Cheers,
P.H.Giao
Asian Inst. of Techn (AIT)
Groundwater level cannot be always be detected by VES. As the groundwater level depends entirely on the aquifer condition and is result of pore pressure which is not reflected in VES hence it may be difficult to use VES to detect groundwater level.
Dear Sorja,
of course VES is still a well established method for determining the depth to the groundwater horizon and the aquifer properties. As some of the contributors mentioned, additional borehole information is important. Besides that, you could consider using shallow refraction seismics, as the water table is always a very distinct refractor vor P-waves.
Greetings
Rainer
I agree with V.S. Singh. It's not possible to detect the depth to the water table using VES, In the absence of direct geological and hydrogeological data, its rather better to consider the depths obtained by VES as depths to the saturated zone not to the exact water table depth.
@all, thank for all valuable answer. I will consider this discussion for input of my paper.
Best.
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