Abstract
Landslides constitute a major threat to people’s lives and property in mountainous regions such, as in the Three Gorges area in China. Synthetic Aperture Radar Interferometry (InSAR) with its wide coverage and unprecedented displacement measuring capabilities has been widely used in landslide monitoring. However, it is difficult to apply traditional InSAR techniques to investigate landslides having large deformation gradients or moving primarily in north-south direction. In this study, we propose a time series split-bandwidth interferometry (SBI) procedure to measure two dimensional (azimuth and range) displacements of the Shuping landslide in the Three Gorges area with 36 TerraSAR-X high resolution spotlight (HS) images acquired from February 2009 to April 2010. Since the phase based SBI procedure is sensitive to noise, we focused on extracting displacements of corner reflectors (CRs) installed on or surrounding the Shuping landslide. Our results agreed well with measurements obtained by the point-like targets offset tracking (PTOT) technique and in-situ GPS stations. Centimeter level accuracy could be achieved with SBI on CRs which shows great potential in futures studies on fast moving geohazards.
Highlights
A landslide refers to the movement of rock, earth, and debris downward upon a slope which may be caused by natural factors or human activities [1]
The Three Gorges area is frequently affected by landslide hazards, and there have been more than 3800 reported landslides [2]
The pixel shift ∆t in units of time can be retrieved from the phase phase variation within its main lobe depending on the signal’s center frequency fc, a pixel offset Δt in difference φsplit, given the spectral separation ∆fc between the two sublook images [27]: seconds will lead to an additional phase term 2πfcΔt in standard InSAR, mixed with interferometric phases containing topography, atmospheric delay, and displacement [27]
Summary
A landslide refers to the movement of rock, earth, and debris downward upon a slope which may be caused by natural factors or human activities [1]. As a prevalent geohazard in mountainous areas, it poses a serious danger to local residents. Continuous monitoring of landslide activity in these areas is essential to ensure public safety. The Three Gorges area is frequently affected by landslide hazards, and there have been more than 3800 reported landslides [2]. The water level varies between 145 m and 175 m according to the dam’s operation scheme. The annual water level fluctuation contributed much to the destabilization of bank slopes along the Yangtze River which can inevitably aggravate geohazards such as landslides and rock falls
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