Technical Note : Glacial influence in tropical mountain hydrosystems evidenced by the diurnal cycle in water levels
Worldwide, the rapid shrinking of glaciers in response to ongoing climate change is modifying the glacial meltwater contribution to hydrosystems in glacierized catchments. Determining the influence of glacial runoff to streams is therefore of critical importance to evaluate potential impact of glaci...
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ftird:oai:ird.fr:fdi:010061429 2023-05-15T15:18:17+02:00 Technical Note : Glacial influence in tropical mountain hydrosystems evidenced by the diurnal cycle in water levels Cauvy Fraunié, S. Condom, Thomas Rabatel, A. Villacis, M. Jacobsen, D. Dangles, Olivier EQUATEUR ANDES 2013 text/pdf http://www.documentation.ird.fr/hor/fdi:010061429 EN eng http://www.documentation.ird.fr/hor/fdi:010061429 oai:ird.fr:fdi:010061429 Cauvy Fraunié S., Condom Thomas, Rabatel A., Villacis M., Jacobsen D., Dangles Olivier. Technical Note : Glacial influence in tropical mountain hydrosystems evidenced by the diurnal cycle in water levels. Hydrology and Earth System Sciences, 2013, 17 (12), p. 4803-4816. text 2013 ftird 2020-08-21T06:54:05Z Worldwide, the rapid shrinking of glaciers in response to ongoing climate change is modifying the glacial meltwater contribution to hydrosystems in glacierized catchments. Determining the influence of glacial runoff to streams is therefore of critical importance to evaluate potential impact of glacier retreat on water quality and aquatic biota. This task has challenged both glacier hydrologists and ecologists over the last 20 yr due to both structural and functional complexity of the glacier-stream system interface. Here we propose quantifying the diurnal cycle amplitude of the stream-flow to determine the glacial influence in glacierized catchments. We performed water-level measurements using water pressure loggers over 10 months at 30 min time steps in 15 stream sites in 2 glacier-fed catchments in the Ecuadorian Andes (> 4000 m a.s.l.) where no perennial snow cover is observed outside the glaciers. For each stream site, we performed wavelet analyses on water-level time series, determined the scale-averaged wavelet power spectrum at 24 h scale and defined three metrics, namely the power, frequency and temporal clustering of the diurnal flow variation. The three metrics were then compared to the percentage of the glacier cover in the catchments, a metric of glacial influence widely used in the literature. As expected, we found that the diurnal variation power of glacier-fed streams decreased downstream with the addition of non-glacial tributaries. We also found that the diurnal variation power and the percentage of the glacier cover in the catchment were significantly positively correlated. Furthermore, we found that our method permits the detection of glacial signal in supposedly non-glacial sites, thereby revealing glacial meltwater resurgence. While we specifically focused on the tropical Andes in this paper, our approach to determine glacial influence may have potential applications in temperate and arctic glacierized catchments. The measure of diurnal water amplitude therefore appears as a powerful and cost-effective tool to understand the hydrological links between glaciers and hydrosystems better and assess the consequences of rapid glacier shrinking. Text Arctic Climate change IRD (Institute de recherche pour le développement): Horizon Arctic |
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IRD (Institute de recherche pour le développement): Horizon |
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English |
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Worldwide, the rapid shrinking of glaciers in response to ongoing climate change is modifying the glacial meltwater contribution to hydrosystems in glacierized catchments. Determining the influence of glacial runoff to streams is therefore of critical importance to evaluate potential impact of glacier retreat on water quality and aquatic biota. This task has challenged both glacier hydrologists and ecologists over the last 20 yr due to both structural and functional complexity of the glacier-stream system interface. Here we propose quantifying the diurnal cycle amplitude of the stream-flow to determine the glacial influence in glacierized catchments. We performed water-level measurements using water pressure loggers over 10 months at 30 min time steps in 15 stream sites in 2 glacier-fed catchments in the Ecuadorian Andes (> 4000 m a.s.l.) where no perennial snow cover is observed outside the glaciers. For each stream site, we performed wavelet analyses on water-level time series, determined the scale-averaged wavelet power spectrum at 24 h scale and defined three metrics, namely the power, frequency and temporal clustering of the diurnal flow variation. The three metrics were then compared to the percentage of the glacier cover in the catchments, a metric of glacial influence widely used in the literature. As expected, we found that the diurnal variation power of glacier-fed streams decreased downstream with the addition of non-glacial tributaries. We also found that the diurnal variation power and the percentage of the glacier cover in the catchment were significantly positively correlated. Furthermore, we found that our method permits the detection of glacial signal in supposedly non-glacial sites, thereby revealing glacial meltwater resurgence. While we specifically focused on the tropical Andes in this paper, our approach to determine glacial influence may have potential applications in temperate and arctic glacierized catchments. The measure of diurnal water amplitude therefore appears as a powerful and cost-effective tool to understand the hydrological links between glaciers and hydrosystems better and assess the consequences of rapid glacier shrinking. |
format |
Text |
author |
Cauvy Fraunié, S. Condom, Thomas Rabatel, A. Villacis, M. Jacobsen, D. Dangles, Olivier |
spellingShingle |
Cauvy Fraunié, S. Condom, Thomas Rabatel, A. Villacis, M. Jacobsen, D. Dangles, Olivier Technical Note : Glacial influence in tropical mountain hydrosystems evidenced by the diurnal cycle in water levels |
author_facet |
Cauvy Fraunié, S. Condom, Thomas Rabatel, A. Villacis, M. Jacobsen, D. Dangles, Olivier |
author_sort |
Cauvy Fraunié, S. |
title |
Technical Note : Glacial influence in tropical mountain hydrosystems evidenced by the diurnal cycle in water levels |
title_short |
Technical Note : Glacial influence in tropical mountain hydrosystems evidenced by the diurnal cycle in water levels |
title_full |
Technical Note : Glacial influence in tropical mountain hydrosystems evidenced by the diurnal cycle in water levels |
title_fullStr |
Technical Note : Glacial influence in tropical mountain hydrosystems evidenced by the diurnal cycle in water levels |
title_full_unstemmed |
Technical Note : Glacial influence in tropical mountain hydrosystems evidenced by the diurnal cycle in water levels |
title_sort |
technical note : glacial influence in tropical mountain hydrosystems evidenced by the diurnal cycle in water levels |
publishDate |
2013 |
url |
http://www.documentation.ird.fr/hor/fdi:010061429 |
op_coverage |
EQUATEUR ANDES |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change |
genre_facet |
Arctic Climate change |
op_relation |
http://www.documentation.ird.fr/hor/fdi:010061429 oai:ird.fr:fdi:010061429 Cauvy Fraunié S., Condom Thomas, Rabatel A., Villacis M., Jacobsen D., Dangles Olivier. Technical Note : Glacial influence in tropical mountain hydrosystems evidenced by the diurnal cycle in water levels. Hydrology and Earth System Sciences, 2013, 17 (12), p. 4803-4816. |
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