Temporal dynamic of ice-rich riverbank erosion · Thank you for your attention! River ice on Lena...
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Temporal dynamic of ice-rich riverbank erosion Samuel Stettner 1 , Hugues Lantuit 1 , Annett Bartsch 2,3 , Birgit Heim 1 , Guido Grosse 1 , Achim Roth 4 , Barbara Widhalm 2,3 1 Alfred Wegener Institute, Germany, D-14473 Potsdam Telegrafenberg A43 2 Central Institute of Meteorology & Geodynamics, Austria, A-1190 Wien, Hohe Warte 38 3 Department of Geodesy and Geoinformation, Vienna University of Technology, Austria, A-1040 Vienna Gußhausstr. 25-29 4 Department Land Surface, German Aerospace Center, Germany, Oberpfaffenhofen 82234 Weßling
Transcript of Temporal dynamic of ice-rich riverbank erosion · Thank you for your attention! River ice on Lena...
Temporal dynamic of ice-rich riverbank erosion
Samuel Stettner 1, Hugues Lantuit 1, Annett Bartsch 2,3, Birgit Heim 1, Guido Grosse 1, Achim Roth 4, Barbara Widhalm 2,3 1 Alfred Wegener Institute, Germany, D-14473 Potsdam Telegrafenberg A43 2 Central Institute of Meteorology & Geodynamics, Austria, A-1190 Wien, Hohe Warte 38 3 Department of Geodesy and Geoinformation, Vienna University of Technology, Austria, A-1040 Vienna Gußhausstr. 25-29 4 Department Land Surface, German Aerospace Center, Germany, Oberpfaffenhofen 82234 Weßling
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Test site
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July 2013
June 2015
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Data & methods I
1960’s 2010 2016 2012 2013 2014 2015
Time-lapse
2006 2011
Optical SAR
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Data & methods II
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Data & methods III
SAR-image Threshold Expanding Shrinking Vector
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JUN 2013 JUL 2013 AUG 2013 SEP 2013
Cliff top retreat
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Optical TerraSAR-X
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Field validation 2015
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Wooden markers every 50 cm distance
„loss“ of stakes every 3 to 8 days
July = 3 m; August 2.5 m
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Time-lapse June & July 2015
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Conclusions
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TerraSAR-X time-series is: suitable for detecting seasonal dynamics of
rapid permafrost degradation
bridging the temporal gap between optical long-term archives and field based measurements
indicating permanent cliff top erosion within the thawing period
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Next steps:
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Systematic analysis of cliff top retreat rates
Environmental forcing
DEM analysis
Thank you for your attention!
River ice on Lena River after ice break up in June 2015, Samoylov
