Both electromagnetic induction and CVES measure changes in electrical properties of the subsurface, which can be related to grainsize. No information about vertical changes, and thus channel belt thickness, can be obtained. It is a very useful tool to delineate the approximate boundaries of the channel belt. The GEA-58 measures both lateral and vertical changes in electrical resistivity and allows for calculating the true resistivity of the subsurface. However, the relatively deep penetration reduces vertical resolution.
Horizontal resolution reduces with depth.
Nevertheless, the geometry of the channel belt and the connection of the Holocene paleochannel with the Pleistocene substratum is clearly shown. The thickness of the channel belt is slightly underestimated. All described methods are applicable in shallow fluvial deposits but have specific advantages and disadvantages. GPR is a method for continuous profiling with the highest lateral and vertical resolution and is therefore the best method for imaging sedimentary structures. However, use is generally restricted to soils with a low conductivity.