Science Service System

Summary of Proposal GEO2497

TitleMonitoring of rockslide and periglacial processes in northern Norway using TerraSAR-X Staring Spotlight InSAR
Investigator Lauknes, Tom Rune - Norut, Earth Observation
Team Members
Dr. Larsen, Yngvar - Northern Research Institute Tromsø, Earth Observation
Dr. Grydeland, Tom - Northern Research Institute Tromsø, Earth Observation
Dr. Eckerstorfer, Markus - Northern Research Institute Tromsø, Earth Observation
Mr. Øverli Eriksen, Harald - Northern Research Institute Tromsø, Earth Observation
Dr. Dehls, John F. - Geological Survey of Norway, N/A
Prof. Blikra, Lars Harald - University of Tromsø, Department of Geology
Mr. Marinkovic, Petar - PPO Labs, N/A
SummarySummary and objective Landslides are among the most serious natural hazards in Norway, also because of their tsunamigenic potential, which has taken more than 170 lives in Norway during the last 100 years. With the increased public attention on these problems in parts of Norway as well as internationally, studies of hazards related to rock slope failures are important activities. The movement rates of the landslides range from a few mm to several cm per year. Traditionally, a discrete network of benchmarks have been installed and periodically precisely leveled. Lately, GPS stations have been used, providing a accurate measure of subsidence. Both methods allow the precise monitoring of land deformation at the selected grid of points, but for large areas, the technique is time consuming and expensive. Furthermore, the discrete network is often too sparse to detect localized deformation, and it is not measured frequently enough to be able to monitor rapid hazardous changes. A multi-year study of the geology and landslide hazards on a regional scale in many areas of Norway is currently being undertaken, where geotechnical instrumentation and InSAR data is utilized to understand the spatial and temporal characteristics of the landslides. Ongoing permafrost landscape change due to climate warming calls for process monitoring at landscape scale. This can currently not be achieved by point field observations only. There is therefore a clear need for remote sensing data that can detect surface displacement that is associated with the landscape change. InSAR provides such possibilities and is together with detailed geomorphological and geophysical process monitoring a feasible and important tool. The Stripmap mode TSX data we have acquired as part of the DLR GEO0565 and GEO0764 projects have been instrumental in defining the outlines of the landslide. In this project we will investigate potential use of the Staring Spotlight mode of TerraSAR-X applied to the Nordnes rockslide. This area also includes different permafrost landforms such as solifluction sheets and lobes, blockfields, rock fall and avalanche fans, making the study site a unique location. Method Multitemporal InSAR and feature tracking will be performed to detect fine-scale surface displacements. For time series analysis, we will apply both the short baseline subset (SBAS) and the Persistent Scatterer (PSI) methods. The effects of wavelength, as well as temporal and spatial resolution will be investigated by comparing results from multiple sensors, resolutions, wavelengths, and acquisition modes. The Norut GSAR software will be used for all processing, and necessary modifications will be made to this software to fully support the Staring Spotlight mode of TSX. Data requirements In order to fully assess, and to capture rapid ground displacement changes, we would like to cover the Nordnes study area during two snow-free seasons (approximately 15 scenes each year at each site from approximately May 15 to October 15). Since it is imperative to separate vertical and horizontal displacement components, we would like to acquire data from both ascending and descending orbits. In addition, we would like to continue the Stripmap mode data series that we have been collecting for 5 years (since 2009). In total for two years we request 60 Staring Spotlight scenes, and 60 Stripmap mode TerraSAR-X scenes. We request Single Look Complex data. Deliverables We will produce interpreted surface deformation maps, including geology and validated by in-situ measurements. All results will be published in scientific journals. Source of fundingThe activities of this project will be part of existing projects, so no additional funding will be required. Software development is currently funded by the Norwegian Space Centre, Norut and the Geological Survey of Norway. Their institutions fund the time devoted to the project by the project participants.

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