Author(s): Kapeller Gerhard; Goltz Matthias; Aufleger Markus
Linked Author(s):
Keywords: DTS; Landslide; Filter velocity; Degree of Saturation; Longtime monitoring
Abstract: The closer understanding of the hydraulic and geotechnical subsurface processes in hillslopes is still a challenge for engineers. By using fibre optic cables the common triggers of potential landslides, i.e. the local filter velocity as well as degree of saturation, can be obtained in a distributed way, based on the Distributed Fiber Optic Temperature (DFOT) measurement along the cable. The primary goal is the introduction and verification of suitability of distributed saturation and velocity measurement for monitoring subsurface flow in hillslopes as well as the optimisation of the specific application in hillslopes. For this purpose the fibre will be installed in different levels within the natural slope. The installation procedure as well as the refilling of the ditches will be investigated. To take care of water deflection in ditches different types of refill material have to be considered, e.g. trench refilling, artificial surroundings, etc. Short heavy rainfall as well as long time rainfall will be simulated by using a sprinkler irrigation system. To ensure fibre optic temperature deliverables also some conventional instruments, e.g. TDR-probes, temperature sensor, rain gauge, etc. get installed. Based on the high information density of the measured main triggers the complex processes within hillslopes will be more understandable and moreover the actual condition of hillslopes will be pre-estimated.
Year: 2009