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2015 International Congress on Ultrasonics, Metz, FRA, 10-/05/2015 - 14/05/2015International audienceThe aim of this study was to find a relevant criterion to detect and map tree roots in the surrounding soil. In each experiment, we studied properties of propagation, especially velocity and attenuation of amplitude, as parameters to discriminate the roots from the soil. Our work was initiated by laboratory experiments with an ultrasonic transmission device to highlight relative differences between samples of soil and roots. Measurements were repeated on different root samples (species, dimension, decomposition time) to cover the diversity encountered on dikes. Then an intermediate state device reproducing in-situ conditions in laboratory was performed at the soil surface in two plastic containers: one control with only soil and another containing a buried root sample . We shown with laboratory experiments that information provided by the velocity term seems relevant to localize roots in the soil for healthy root samples. The study in containers gave similar results,  significant variations of velocity being observed due to root presence

Preliminary Use of Ultrasonic Tomography Measurement to Map Tree Roots Growing in Earth Dikes