Methods for detecting channel bed surface changes in a mountain torrent – experiences from the Dorfbach torrent
The erosion of and depositions on channel bed surfaces are instrumental to understanding debris flow processes. We present an overview of existing field methods and highlight their respective advantages and disadvantages. Terrestrial laser scanning (TLS), airborne laser scanning (ALS), erosion senso...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | deu |
| Published: |
Copernicus Publications
2015-10-01
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| Series: | Geographica Helvetica |
| Online Access: | http://www.geogr-helv.net/70/265/2015/gh-70-265-2015.pdf |
| Summary: | The erosion of and depositions on channel bed surfaces are instrumental to
understanding debris flow processes. We present an overview of existing
field methods and highlight their respective advantages and disadvantages.
Terrestrial laser scanning (TLS), airborne laser scanning (ALS), erosion
sensors, cross sections (CS) and geomorphological mapping are compared.
Additionally, two of these approaches (i.e. TLS and CS) are tested and
applied in the channel reaches of the torrent catchments. The results of the
comparison indicate that the methods are associated with variable temporal
and spatial resolution as well as data quality and invested effort. TLS data
were able to quantify small-scale variations of erosion and deposition
volumes. While the same changes could be detected with CS and
geomorphological mapping, it was only possible with lower precision and
coarser spatial resolution. The study presents a range of potential methods
that can be applied accordingly to address the objectives and to support the
analyses of specific applications. The availability of erosion data,
acquired mainly by TLS and ALS, in combination with debris-flow monitoring
data, provides promising sources of information to further support torrent
risk management. |
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| ISSN: | 0016-7312 2194-8798 |