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Worldwide, the rapid shrinking of glaciers in response to ongoing climatechange is modifying the glacial meltwater contribution to hydrosystems inglacierized catchments. Determining the influence of glacial runoff tostreams is therefore of critical importance to evaluate potential impact ofglacier retreat on water quality and aquatic biota. This task has challengedboth glacier hydrologists and ecologists over the last 20 yr due to bothstructural and functional complexity of the glacier–stream system interface.Here we propose quantifying the diurnal cycle amplitude of the streamflowto determine the glacial influence in glacierized catchments. We performedwater-level measurements using water pressure loggers over 10 months at 30 mintime steps in 15 stream sites in 2 glacier-fed catchments in theEcuadorian Andes (> 4000 m a.s.l.) where no perennial snow coveris observed outside the glaciers. For each stream site, we performedwavelet analyses on water-level time series, determined the scale-averagedwavelet power spectrum at 24 h scale and defined three metrics, namely thepower, frequency and temporal clustering of the diurnal flow variation. Thethree metrics were then compared to the percentage of the glacier cover inthe catchments, a metric of glacial influence widely used in the literature.As expected, we found that the diurnal variation power of glacier-fedstreams decreased downstream with the addition of non-glacial tributaries.We also found that the diurnal variation power and the percentage of theglacier cover in the catchment were significantly positively correlated.Furthermore, we found that our method permits the detection of glacial signal insupposedly non-glacial sites, thereby revealing glacial meltwaterresurgence. While we specifically focused on the tropical Andes in thispaper, our approach to determine glacial influence may have potentialapplications in temperate and arctic glacierized catchments. The measure ofdiurnal water amplitude therefore appears as a powerful and cost-effectivetool to understand the hydrological links between glaciers andhydrosystems better and assess the consequences of rapid glacier shrinking

Technical Note: Glacial influence in tropical mountain hydrosystems evidenced by the diurnal cycle in water levels