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Extraction of thalweg networks from DTMs: application to badlands
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Abstract
Abstract. To study gully spatial patterns in the badlands using a continuous thalweg vector network, this paper presents methods to extract the badlands' thalweg network from a regular grid digital terrain model (DTM) by combining terrain morphology indices with a drainage algorithm. This method will delineate a thalweg only where the DTM denotes a significant curvature with respect to DTM accuracy and relies on three major steps. First, discontinuous concave areas were detected from the DTM using morphological criteria, either the plan curvature or the convergence index. Second, the concave areas were connected using a drainage algorithm, which provides a continuous, thick, tree-structured scheme. We assumed that these areas were physically significant and corresponded to a gully floor. Finally, the thick path was reduced to its main course and vectorised to obtain a thalweg network. The methods were applied to both virtual and actual DTM cases. The actual case was a LiDAR DTM of the Draix badlands in the French Alps. The obtained networks were quantitatively compared, both with a network obtained using the usual drainage area criteria and with a reference network mapped in the field. The CI-based network showed the great potential for thalweg network extraction.
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Other geomorphological characteristics can be altered due to changes in watershed delineation, such as the length of the main river, the number of segments, aspect, and slope.
“Other geomorphological characteristics can also be altered due to changes in watershed delineation, such as the length of the main river, the number of segments, aspect, and slope [60,61].”
From ANADEM: A Digital Terrain Model for South America (2024) · cites this paper as [60]
The Discussion and conclusions table reports different total thalweg-network lengths for three extraction methods in the Moulin catchment. That supports the narrower point that how a network is delineated can affect measured length, but it does not establish that changes in watershed delineation alter the main river’s length, segment count, aspect, or slope. (LLM, conf=0.78)
Experimental — accuracy not yet measuredPrevious studies demonstrate a loss of drainage delineation accuracy in areas with high vegetation cover.
“This coincides with previous studies demonstrating a loss of drainage delineation accuracy in areas with high vegetation cover [60,62].”
From ANADEM: A Digital Terrain Model for South America (2024) · cites this paper as [60]
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ANADEM: A Digital Terrain Model for South America
Laipelt, L., Comini de Andrade, B., Collischonn, W., de Amorim Teixeira, A., Paiva, R. C. D. D., & Ruhoff, A. (2024) · Remote Sensing · doi:10.3390/rs16132321 · Cited by 79
Metadata
- Authors
- Thommeret, N., Bailly, J. S., & Puech, C.
- Venue
- Hydrology and Earth System Sciences
- Publisher
- Copernicus GmbH
- Published
- 2010-08-10
- Volume
- 14
- Issue
- 8
- Pages
- 1527-1536
- ISSN
- 1607-7938
- Cited by
- 51
- References
- 0
- Language
- en
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