Pre-, co-, and post- rockslide analysis with ALOS/PALSAR imagery: a case study of the Jiweishan rockslide, China
On 5 June 2009, a catastrophic rockslide debris flow occurred at the crest of the Jiweishan range, Chongqing Municipality, China, killing 74 people and injuring an additional eight. We use L-band ALOS/PALSAR imagery to address landslide processes before, during and after the slide. We employ three d...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2013-11-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | http://www.nat-hazards-earth-syst-sci.net/13/2851/2013/nhess-13-2851-2013.pdf |
| Summary: | On 5 June 2009, a catastrophic rockslide debris flow occurred at the crest
of the Jiweishan range, Chongqing Municipality, China, killing 74 people and
injuring an additional eight. We use L-band ALOS/PALSAR imagery to address
landslide processes before, during and after the slide. We employ three
different SAR methods, i.e., short baseline subsets (SBAS) interferometric
SAR (InSAR), SAR backscattering intensity change, and InSAR stacking
algorithm, to study any ground deformation before the rockslide, investigate
the affected area, and calculate the topographic change by this slide,
respectively. First, continuous deformation has been observed based on the
available ALOS/PALSAR InSAR imagery during June and December 2007. Second,
the area affected by the landslide can be inferred based on changes in SAR
backscattering intensity as well as surface topography, with an estimated
area of 0.47 million m<sup>2</sup>. Last, an InSAR-derived post-slide digital
elevation model has allowed us to estimate surface height changes due to the
slide, reaching about −80 m at the source region and about 60 m in the
deposit region, respectively. Our InSAR-derived estimates have been
validated using in situ data and 3-D lidar measurements. |
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| ISSN: | 1561-8633 1684-9981 |