Lurin A., Marc O., Meunier P., Carretier Sébastien. (2023). A robust channel head extraction method based on high-resolution topographic convergence, suitable for both slowly and fastly eroding landscapes. Journal of Geophysical Research : Earth Surface, 128 (9), e2022JF006999 [18 p.]. ISSN 2169-9003.
Titre du document
A robust channel head extraction method based on high-resolution topographic convergence, suitable for both slowly and fastly eroding landscapes
Lurin A., Marc O., Meunier P., Carretier Sébastien
Source
Journal of Geophysical Research : Earth Surface, 2023,
128 (9), e2022JF006999 [18 p.] ISSN 2169-9003
Channels are carved by erosive processes such as water or debris flow. At the scale of a drainage basin, they form a channel network which impacts on the water and sediment dynamics of the basin, for example, by controlling its response to storms events in terms of flood and sediment exportation. Understanding how and where channels begin to form is thus of great interest for geomorphologists. However, in steep landscapes, channel heads are hard to identify on the field and the erosive processes acting just below channel heads are not fully understood. Therefore, more data is needed to constrain their location and geometry. High-resolution topographic data have opened up new perspectives in order to get this data. Here we present the CO(2)CHAIN method which automatically extracts channels from digital elevation models. CO(2)CHAIN is consistent with visual channel head mapping made by geomorphologists on four different catchments and seems to perform better than previous methods. This method could be used to revisit the conditions that allow channels to appear in a landscape, including fast eroding basins, and to better understand the competition between unchannelized and channelized erosion processes in these landscapes.
Plan de classement
Géologie et formations superficielles [064]
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Télédétection [126]
