File:Expérimentation Alpes suisses dégazage méthane seuils hydromorphologie échelle micro.jpg
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[edit]| DescriptionExpérimentation Alpes suisses dégazage méthane seuils hydromorphologie échelle micro.jpg |
Français : Bassin versant de Valfredda, captages d'eau sur le ruisseau pour mesure de gaz dissous (source Nature, 17 décembre 2022) : "Les ruptures de pente et chutes d'eau expliquent l'évasion des gaz dissous dans l'eau"
a Vue aérienne de la section du cours d'eau sélectionnée pour l'étude (orthophoto de la partie orientale du bassin versant de Valfredda). Ici, le bleu clair et le rouge indiquent la section A, avec une longueur LA = 1060 m, et la section B, avec une longueur LB = 543 m, respectivement. La vignette montre le segment de référence sans rupture de pente (longueur ℓr = 13 m). b Vue du segment de référence indiqué dans (a). c Exemple d'un pas artificiel, créé en forçant le ruisseau dans une conduite et en recouvrant ensuite le lit de la rivière en aval avec un film plastique. d Exemple d'un pas naturel émoussé. Les vignettes dans les trois images b, c et d montrent les séries chronologiques observées de la concentration en CO2 de l'eau dans les coupes transversales amont (ligne bleue) et aval (ligne orange), dont les positions sont indiquées par des cercles bleus et oranges sur les trois images. " Fait intéressant, la plupart de l'évasion de gaz provoquée par les marches était associée aux plus petites hauteurs de chute. English: Valfredda watershed, water catchments on the stream to measure dissolved gases (source Nature, December 17, 2022): “Slope breaks and waterfalls explain the escape of gases dissolved in the water”
a Aerial view of the section of the watercourse selected for the study (orthophoto of the eastern part of the Valfredda watershed). Here, light blue and red indicate section A, with length LA = 1060 m, and section B, with length LB = 543 m, respectively. The vignette shows the reference segment without slope break (length ℓr = 13 m). b View of the reference segment shown in (a). c Example of an artificial step, created by forcing the stream into a pipe and then covering the downstream river bed with plastic film. d Example of a blunt natural step. The thumbnails in three images b, c and d show the observed time series of water CO2 concentration in the upstream (blue line) and downstream (orange line) cross sections, the positions of which are indicated by blue circles and oranges in all three images. Source : Botter, G., Carozzani, A., Peruzzo, P. et al. Steps dominate gas evasion from a mountain headwater stream. Nat Commun 13, 7803 (2022). https://doi.org/10.1038/s41467-022-35552-3 URL=https://www.nature.com/articles/s41467-022-35552-3 |
| Date | |
| Source | https://www.nature.com/articles/s41467-022-35552-3 |
| Author | Botter, G., Carozzani, A., Peruzzo, P. & Nicola Durighetto |
see also : Leibowitz, Z. W., Brito, L. A. F., De Lima, P. V., Eskinazi-Sant’Anna, E. M. & Barros, N. O. Significant changes in water pCO2 caused by turbulence from waterfalls. Limnologica 62, 1–4 (2017).
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