HYDROSLIDE

HYDROSLIDE
2016
This project aims at improving the observation, understanding and prediction of subsurface processes, which lead to the triggering of clayey landslides, based on an innovative, multi-parameter monitoring technology adapted to the special conditions on this particular landslide type.
Monitoring site La Valette (France)
As a consequence of climate change and, thus, in hydrological cycles, the risk of landslides is growing worldwide. Therefore, there is an urgent demand of a short‐time landslide prediction tool towards risk mitigation. In this project we implement a multidisciplinary approach which consists in the development of hydrogeological and geophysical measurement and interpretation techniques for the real‐time monitoring of processes in clayey landslides. One main issue of the project is the application of the Induced Polarization (IP), an extension of the electrical resistivity method, to delineate the occurrence of clay minerals, which are characterized by a characteristic IP response. The project part that is led by the Geological Survey of Austria will mainly focus on the development and the application of a new monitoring system that in contrary to the currently used system (Geomon4D), can also perform IP measurements in a monitoring mode. Additionally, we will work on the improvement of already existing processing software in terms of an adaption to the special features of our own developed monitoring system, to enhance its efficiency. For a better interpretation of the IP imaging results and to understand the landslide triggering mechanism before the onset of a displacement, additional parameters have to be monitored. Typical approaches consider GPS receivers and total station benchmarks at the surface, or inclinometers at depths, which provide only punctual 1D information, but have limitations at high displacement rates. To solve interpretation ambiguities, but also to account for spatial changes, in our proposal we consider horizontally and vertically (borehole) distributed displacement/strain measurements. In addition to this, new approaches will be applied, namely temperature and strain monitoring at high frequency with Fiber‐Optic (FO) cables both at the surface and in boreholes and sensing of surface deformation with Ultra‐High Resolution (UHR, 20 cm) optical images. This part of the monitoring concept is conducted by the French partners. Coupled multi‐physical modelling simulations to gain the understanding of underlying processes will support the joint interpretation of available monitoring datasets. The HYDROSLIDE project benefits from the European landslide‐monitoring network that has been continuously developed by the Geological Survey of Austria (GSA) in collaboration with national and international partners since the year 2007 in the frame of different research projects.
Projectfacts
Project titleHYDRO-geophysical observations for an advanced understanding of clayey landslides
Project acronymHYDROSLIDE
Project short titleHYDROSLIDE
Project managerMag. Robert Supper (Geologische Bundesanstalt, österreichischer Teil), Dr. Jean-Philippe Malet (Universität Straßburg/EOST, französischer Teil)
Project membersTU Wien, KIGAM (Südkorea), Universität Straßburg/EOST (Ecole et Observatoire des Science de la Terre (F)), Universität Montpellier/Geoscience Montpellier (F), TU Delft (NL)
DepartmentGeophysics
Period of time01.02.16 - 01.02.18
FinancingFWF, International cooperation Project (Joint Project)