Relation between planimetric and volumetric measurements of permafrost coast erosion: a case study from Herschel Island, western Canadian Arctic

Polar research

Michael Fritz²  Torsten Sachs³  Hugues Lantuit³  Frank Günther⁵  Wayne H. Pollard⁵  Jaroslav Obu⁵ 

[1]Department of Earth SciencesUtrecht University, Heidelberglaan 2, NL-3584 CS Utrecht, The Netherlands

[2]Department of Geosciences University of Oslo, PO Box 1047, NO-0316 Blindern, Oslo, NorwayCorrespondence

[3]Institute of Earth and Environmental Science University of Potsdam, Am Neuen Palais 10, DE-14469 Potsdam, Germany

[4]Department of GeographyMcGill University, 805 Sherbrooke Street West, Montreal, Canada

[5]Department of Periglacial Research Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Telegrafenberg A43, DE-14473 Potsdam, Germany

[6]German Research Centre for Geosciences, Telegrafenberg, DE-14473 Potsdam, Germany

关键词: Coastal erosion;    LiDAR;    carbon fluxes;    mass wasting;    landslides;    digital elevation model.;   

DOI  :  10.3402/polar.v35.30313

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Ice-rich permafrost coasts often undergo rapid erosion, which results in land loss and release of considerable amounts of sediment, organic carbon and nutrients, impacting the near-shore ecosystems. Because of the lack of volumetric erosion data, Arctic coastal erosion studies typically report on planimetric erosion. Our aim is to explore the relationship between planimetric and volumetric coastal erosion measurements and to update the coastal erosion rates on Herschel Island in the Canadian Arctic. We used high-resolution digital elevation models to compute sediment release and compare volumetric data to planimetric estimations of coastline movements digitized from satellite imagery. Our results show that volumetric erosion is locally less variable and likely corresponds better with environmental forcing than planimetric erosion. Average sediment release volumes are in the same range as sediment release volumes calculated from coastline movements combined with cliff height. However, the differences betwe...

【 授权许可】

CC BY-NC