A non-invasive preferential root distribution analysis methodology from a slope stability approach

•A new non-invasive methodology combining GPR output and a theoretical root distribution model is presented.•GPR output data improved the accuracy of the theoretical root distribution model when estimating root distribution patterns.•Good correlations between the methodology outcome and the intrusive field work obtained data were found.•The cone method was proven to be a useful tool for both depicting and explaining the asymmetric root distribution pattern. Asymmetric root distribution pattern on steep terrain is analysed by combining GPR (Ground Penetrating Radar) image analysis with a theoretical root distribution model and is verified with field investigation data. Root distribution and morphology of a mature deciduous tree were analysed in terms of the plant’s anchorage needs in an asymmetric loading condition scenario. The GPR method was combined with trench profile and root excavation techniques for both the structural and non-structural root data collection. Good correlations between the field analysis, the theoretical model outcome and the GPR output imagery were found. GPR was proven to be an efficient tool for both root lateral distribution characterisation and vertical root cluster distribution. The combination of the GPR output with a theoretical root distribution model seemed to be a viable non-invasive methodology for assessing root system vertical and horizontal distribution.