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| Titel |
Extraction of thalweg networks from DTMs: application to badlands |
| VerfasserIn |
N. Thommeret, J. S. Bailly, C. Puech |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 14, no. 8 ; Nr. 14, no. 8 (2010-08-10), S.1527-1536 |
| Datensatznummer |
250012398
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| Publikation (Nr.) |
 copernicus.org/hess-14-1527-2010.pdf |
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| Zusammenfassung |
| 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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