Members of the ERODYN team at the Free University of Bozen-Bolzano have developed a novel in-situ method for measuring the surface-parallel tensile strength of the top soil. The densely interwoven roots of herbaceous vegetation can form a strong reinforcement in the top soil (“surface-mat”), and this may be an important factor for resistance against small-scale shallow erosion, e.g. by lateral redistribution of stress and prevention of tension cracks in the turf. The method has been applied at montane grassland test sites to investigate potential effects of soil physical and biological factors. The results suggest that suitable vegetation management can enhance the top soil stability through increasing the surface-mat effect.
More details are published here:
A new paper in the journal Photogrammetric Engineering & Remote Sensing presents methods for landslide and erosion monitoring based on terrestrial laser scanning point clouds. The 3D approach combines deformation detection and a geomorphological object classification automatically. This enhances the analysis and interpretability of a point cloud time series for erosion and landslide assessment.
Mayr, A.; Rutzinger, M.; Geitner, C. (2019): Object-based point cloud analysis for landslide and erosion monitoring. Photogrammetric Engineering & Remote Sensing, 85 (6), 455 – 462.
The following figure shows some example results obtained with the presented approach:
Left: Cumulative mean 3D deformation per class for a shallow landslide (calculated with a constant registration error parameter reg = 0.1 m), pointing to two time steps with pronounced changes at the landslide scarp. Right: Having a closer look at the first time step shows scarp erosion and the deposition of some dislocated scarp fragments), with (a) a 3D view of the second point cloud epoch coloured by mean deformation per object, (b) transect coloured by mean deformation per object, (c) transect overlaying the points of both epochs coloured by their class labels.
Preliminary results from an ERODYN experiment will be presented with a poster at this years EGU (European Geosciences Union General Assembly) in Vienna:
Lloyd, J., Mejia-Aguilar, A., Tonin, R., Loebmann, M., Gild, Ch., Mayr, A., and Sonnenschein, R.:
UAV-based hyperspectral techniques for monitoring shallow erosion in alpine pastures
Wednesday 10 April, 08:30–10:15, Hall A
Eurac Research (Bozen, Italy) is looking for a MSc student / trainee within the ERODYN project. The traineeship will focus on hyperspectral data acquisition and processing to characterize grassland vegetation in the context of erosion susceptibility. There will likely be the possibility to write a MSc thesis on this topic after the traineeship.
More info here: EURAC_MScThesis_HyperspectralApps_RS.
This summer the team from the University of Bozen has sampled vegetation at test sites in the Nature Park Puez – Geisler, aiming at a spatial analysis and an assessment of different types of grassland vegetation with respect to landuse and erosion susceptibility.
At the same site the EURAC team was flying with an unmanned aerial vehicle (UAV), equipped with multi- and hyperspectral cameras, while field spectrometer measurements on the ground were collected for calibration of the UAV data. The aim of this experiment is to assess how multi-/hyperspectral data can help to characterize relevant grassland vegetation parameters in the context of erosion studies.
A grassland slope has been surveyed with a terrestrial laser scanner (TLS) to map eroded areas and their morphology. The detailed terrain data from TLS will also be integrated with multi-/hyperspectral data from an unmanned aerial vehicle (UAV) and botanical surveys from field plots to map and analyse vegetation types.
Our contribution to the ISPRS Symposium in Riva del Garda is now online in the ISPRS Archives, the series of peer-reviewed proceedings published by the International Society of Photogrammetry and Remote Sensing (open access):
Mayr, A., Rutzinger, M. & Geitner, C. (2018): Multitemporal analysis of objects in 3D point clouds for landslide monitoring. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLII-2, 691–697.
Last week the ISPRS Technical Commission II Symposium 2018 took place in Riva del Garda, Italy, with participants from 37 countries. Researchers, practioners and companies presented and discussed the state-of-the-art in photogrammetry, computer vision, and remote sensing.
Members of the ERODYN team contributed to the session “3D Mapping for Environmental & Infrastructure Monitoring” with a talk about the latest methodological developments in object-based landslide and erosion monitoring using terrestrial laser scanning point clouds.
… and looking forward to this summer’s field work!
The ERODYN consortium, with members from the Autonomous Province of Bozen – South Tyrol, the University of Innsbruck (Institute of Geography), EURAC research (Bozen, Institute for Earth Observation) and the University of Bozen (Faculty of Science and Technology), met for the project kickoff in Bozen. The team discussed the project objectives and the work plan for investigating shallow erosion dynamics in mountain grasslands of South Tyrol.