Webinar Announcement
A Frozen History of Meandering: Mapping and Modeling Permafrost Polygons on Point Bars
9 November 2023
9:00 a.m. Alaska Time
For more information, go to:
https://arcticdata.io/catalog/portals/permafrost/Stay-Connected
Organizers announce the second webinar in the Permafrost Discovery Network Monthly Webinar Series. This webinar, featuring Zoltan Sylvester at the University of Texas at Austin and titled A Frozen History of Meandering: Mapping and Modeling Permafrost Polygons on Point Bars, will take place 9 November 2023 at 9:00 a.m. Alaska Time.
Webinar Abstract:
A number of meandering rivers in the Arctic, especially in Siberia, have point bars with strikingly structured permafrost polygon patterns. These seem to mimic not just the scroll ‘bar’ lines that are often visible in permafrost-free point bars, but the radial growth lines as well that tend to be perpendicular to the scrolls and have not been observed before. Researchers use a Unet-type convolutional neural network to map the polygons. The network is trained with image tiles derived from manually mapped scroll- and radial lines on nine point bars. Post-processing of the semantic segmentation results allows the identification of individual polygons; a Python ‘networkx’ graph is used to study the relations between the polygons. A simple model of meandering suggests a preliminary explanation of how these beautiful patterns might form.
For more information, go to:
https://arcticdata.io/catalog/portals/permafrost/Stay-Connected
To access the webinar, at the time of the event, go to:
https://woodwellclimate-org.zoom.us/j/87469526724?pwd=VE1YcDlYTXpxRlM5S…
For questions, contact:
Emily Longano
Email: ealongano [at] gmail.com
Phone: 630-287-0168