@article{fdi:010061429,
  title = {{T}echnical {N}ote : {G}lacial influence in tropical mountain hydrosystems evidenced by the diurnal cycle in water levels},
  author = {{C}auvy {F}rauni{\'e}, {S}. and {C}ondom, {T}homas and {R}abatel, {A}. and {V}illacis, {M}. and {J}acobsen, {D}. and {D}angles, {O}livier},
  editor = {},
  language = {{ENG}},
  abstract = {{W}orldwide, the rapid shrinking of glaciers in response to ongoing climate change is modifying the glacial meltwater contribution to hydrosystems in glacierized catchments. {D}etermining 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. {T}his 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. {H}ere we propose quantifying the diurnal cycle amplitude of the stream-flow to determine the glacial influence in glacierized catchments. {W}e 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 {E}cuadorian {A}ndes (> 4000 m a.s.l.) where no perennial snow cover is observed outside the glaciers. {F}or 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. {T}he 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. {A}s expected, we found that the diurnal variation power of glacier-fed streams decreased downstream with the addition of non-glacial tributaries. {W}e also found that the diurnal variation power and the percentage of the glacier cover in the catchment were significantly positively correlated. {F}urthermore, we found that our method permits the detection of glacial signal in supposedly non-glacial sites, thereby revealing glacial meltwater resurgence. {W}hile we specifically focused on the tropical {A}ndes in this paper, our approach to determine glacial influence may have potential applications in temperate and arctic glacierized catchments. {T}he 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.},
  keywords = {{EQUATEUR} ; {ANDES}},
  booktitle = {},
  journal = {{H}ydrology and {E}arth {S}ystem {S}ciences},
  volume = {17},
  numero = {12},
  pages = {4803--4816},
  ISSN = {1027-5606},
  year = {2013},
  DOI = {10.5194/hess-17-4803-2013},
  URL = {https://www.documentation.ird.fr/hor/fdi:010061429},
}