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