English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Abstract. Topographic change at a given location usually resultsfrom multiple processes operating over different timescales. However,interpretations of surface change are often based upon single values ofmovement, measured over a specified time period or in a single direction.This work presents a method to help separate surface change types that occurat different timescales related to the deformation of an active rockglacier, drawing on terrestrial lidar monitoring at sub-monthly intervals.To this end, we derive 3D topographic changes across the Auseres Hochebenkar rock glacier inthe Otztal Alps. These changes are presented as the relativecontribution of surface change during a 3-week period (2018) to theannual surface change (2017–2018). They are also separated according to thespatially variable direction perpendicular to the local rock glacier surface(using point cloud distance computation) and a single main direction of rockglacier flow, indicated by movement of individual boulders. In a1500 m 2 sample area in the lower tongue section of the rockglacier, the contribution of the 3-week period to the annual changeperpendicular to the surface is 20 %, compared with 6 % in the directionof rock glacier flow. Viewing change in this way, our approach providesestimates of surface change in different directions that are dominant atdifferent times of the year. Our results demonstrate the benefit of morefrequent lidar monitoring and, critically, the requirement for novelapproaches to quantifying and disaggregating surface change, as a steptowards rock glacier observation networks focusing on the analysis of 3Dsurface change over time.

Measurement of rock glacier surface change over different timescales using terrestrial laser scanning point clouds