Open Session - SWISS GEOSCIENCE MEETINGs

268
Symposium 9: Natural Hazards and Risks
The scheme is field-applicable with data usually available or that can be produced on-site and delivers a preliminary assessment
of hazards and risks connected to the presence of landslides on the slopes of accumulation reservoirs. We present and
discuss the scheme and show its application in a project in Romania, where a preliminary screening on a number of reservoirs
was conducted to identify key characteristics in terms of hazard and risk.
Figure 1. Hazard and risk situations due to the presence of a landslide on an accumulation reservoir.
REFERENCES
Beffa C. (2000): Ein Parameterverfahren zur Bestimmung der flächigen Ausbreitung von Breschenabflüssen, Wasser,
Energie, Luft, No. 93, Heft 3/4.
BWG (2002): Sicherheit der Stauanlagen, Basisdokument zu den Unterstellungskriterien. Berichte des BWG, Serie Wasser.
Eisbacher G.H., Clague J.J. (1984): Destructive Mass Movements in High Mountains: Hazard and Management. Geological
Survey of Canada, Paper 84-16.
Huber A. (1997): Quantifying impulse wave effects in reservoirs. 19 ICOLD Congress Florence Q.74(R.35), pp. 563-581.
Huber A., Hager W.H. (1997): Forecasting impulse waves in reservoirs. 19 ICOLD Congress Florence C(31), pp. 993-1005.
Hungr O. (1995): A model for the runout analysis of rapid flow slides, debris flows and avalanches. Canadian Geotechnical
Journal, 32(4):610-623.
.2
Landslide investigation by means of PSiNSARTM radar interferometry:
the Piemonte experience
Carlo Troisi
ARPA Piemonte, Centro Regionale per le Ricerche Territoriali e Geologiche, via Pio VII 9, 10135 Torino, carlo.troisi@regione.piemonte.it ,
carlo.troisi@arpa.piemonte.it
PSiNSARTM technique (hereinafter PS technique) is a registered patent of Politecnico di Milano, Italy, and it is one of the
Persistent Scatterers Methods, i.e. a group of applications which allow the use of satellite-born radar SAR (Synthetic Aperture
Radar) interferometry to detect and measure ground deformations.
The PS Technique identifies single coherent benchmarks, referred to as Permanent Scatterers or PS, and reconstructs their
displacement history. PS’s are natural “radar targets” that are located across the earth’s surface and can be monitored by
satellites. When PS remain coherent within a multi-temporal radar data-set, it is possible to detect and measure millimeter
variations in the sensor-target distance over time. PS’s typically correspond to objects on man-made structures such as buildings,
bridges, dams, water-pipelines, antennae, as well as to stable natural reflectors (typically bare exposed rocks faces).
Starting with the identification of such PS’s, the technique analyzes thousands of square kilometers of territory, within an
extremely short time. Indeed, the PS’s comprise a sort of “natural geodetic network” for accurately monitoring surface deformation
phenomena, as well as the stability of individual structures.