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Author Topic: Ground penetrating radar  (Read 1878 times)

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gold one

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Ground penetrating radar
« on: October 02, 2016, 10:09:06 AM »
Interesting. ..
http://www.kijiji.ca/v-other-heavy-equipment/whitehorse/ground-penetrating-radar/1201439309?enableSearchNavigationFlag=true

After some reading...these gpr's don't go deep enough in wet soils ?

 Dry sandy soils or massive dry materials such as granite, limestone, and concrete tend to be resistive rather than conductive, and the depth of penetration could be up to 15-metre (49 ft). In moist and/or clay-laden soils and materials with high electrical conductivity, penetration may be as little as a few centimetres.

Offline tradergem

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Re: Ground penetrating radar
« Reply #1 on: January 04, 2017, 03:16:15 PM »
So what your saying  is gpr would work better in dry desert rather than wet forest?

Jim

Offline gmradar

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Re: Ground penetrating radar
« Reply #2 on: February 14, 2019, 03:33:57 AM »
GPR is being affected by soil dielectric. Typically the wetter the area the worse for GPR.  This does not mean that GPR doesnt work over wet soils. The killing factor for depth penetration is salts content in soil and not that much water. A combination of water and salt though as you understand gives you almost no depth penetration.

Online mulletator

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Re: Ground penetrating radar
« Reply #3 on: December 20, 2019, 05:50:46 PM »
I used to think that GPR would be a great tool but it doesn't work very well for placer.

I have tested several bedrock mapping techniques including resistivity, GPR and seismic.  Seismic is the best technique by far and also the cheapest. 

GPR will not give good data after it htis water-bearing or clay layers.  Or permafrost.
Resistivity works OK but is also susceptible to ground water effects or conductive layers or fluids.

Seismic sees through everything and gives you the bedrock depth as well as layers inbetween.

Last summer I got my hands on a new passive seismic system that gets sesimic data without requiring dynamite or line cutting.  I have done several surveys this fall in the Yukon and BC and the results are amazing.


* Mulletator is a long time member here and, in his enthusiasm, has taken a simple misstep.,
Direct commercial advertising, including direct links to commercial sites with the intent of sales, by other than forum sponsors, is considered SPAM here.  That prohibition extends to commercial links in signature blocks.   I removed the text and signature links -  and if members wish to pursue details of this service they are directed to use the PM feature here to contact mulletator individually,  away from the forum.

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