Monitoring Rock Glaicer Dynamic

This article has been provided by Heidelberg University in Heidelberg, Germany. The 3D Geospatial Data Processing Group from the university is conducting studies of rock glacier dynamics in a high-Alpine permafrost environment utilizing a RIEGL VZ-2000i terrestrial laser scanner, as well as a UAV equipped with the RIEGL miniVUX-1UAV unmanned laser scanner. Read more about Heidelberg University’s fascinating research below and how their monitoring is providing new insights into rock glaciers and their change processes.

Short-interval (e.g. < monthly) topographic LiDAR monitoring has begun to provide new insights into a range of geomorphic processes. Such 4D data help us to better understand the dynamics of rock glaciers. Rock glaciers are creep phenomena of mountain permafrost. In the era of climate change, rock glaciers are important water reservoirs and potential unstable slopes. Their surface exhibits a range of change processes which feature different spatial characteristics, magnitudes and timescales of occurrence, that are not yet fully understood.

Research in this field is being conducted by the 3D Geospatial Data Processing (3DGeo) Research Group of Heidelberg University in a high-Alpine permafrost environment. With a RIEGL VZ-2000i terrestrial laser scanner, the Äußeres Hochebenkar rock glacier (Ötztal Alps, Austria) is being monitored during the summer period, when the ground is free of snow cover.

Surveying the rock glacier’s headwall and source zone with a RIEGL VZ-2000i at 3021 m a. s. l. (photo: Jack Williams, 20.07.2019).

While conventionally monitored at annual timescales, recent fortnightly monitoring of the rock glacier is being undertaken to quantify the contribution of individual processes to the annual surface change budget. This enables to constrain the various mechanisms of sediment production, transport, and removal from the system.

To obtain a complete picture of these dynamics, the 3DGeo research group will also combine terrestrial LiDAR measurements with data from its recently acquired UAV-borne laser scanning system, equipped with a RIEGL miniVUX-1 UAV unmanned laser scanner.

Based on these 3D time-series datasets, automated methods will be developed that are able to quantify the contribution of individual processes to the total movement of sediment through the point cloud scene.

Such methods can enhance our general understanding of the dynamics of rock glaciers and similar geomorphic objects and their interaction with connected environmental systems.

Photo and 3D point cloud of the entire rock glacier (photo: Vivien Zahs, 20.07.2019; point cloud: Jack Williams).

Website RIEGL

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