Rau P. auteur aut IRD Bourrel Luc auteur aut IRD Labat D. auteur aut IRD Frappart F. auteur aut IRD Ruelland D. auteur aut IRD Lavado W. auteur aut IRD Dewitte Boris auteur aut IRD Felipe O. auteur aut IRD text journalArticle eng text/pdf born digital access Peruvian Pacific drainage catchments only benefit from 2% of the total national available freshwater while they concentrate almost 50% of the population of the country. This situation is likely to lead a severe water scarcity and also constitutes an obstacle to economic development. Catchment runoff fluctuations in response to climate variability and/or human activities can be reflected in extreme events, representing a serious concern (like floods, erosion, droughts) in the study area. To document this crucial issue for Peru, we present here an insightful analysis of the water quantity resource variability of this region, exploring the links between this variability and climate and/or anthropogenic pressure. We first present a detailed analysis of the hydroclimatologic variability at annual timescale and at basin scale over the 1970-2008 period. In addition to corroborating the influence of extreme El Nino events over precipitation and runoff in northern catchments, a mean warming of 0.2 degrees C per decade over all catchments was found. Also, higher values of temperature and potential and actual evapotranspiration were found over northern latitudes. We chose to apply the Budyko-Zhang framework that characterizes the water cycle as a function of climate only, allowing the identification of catchments with significant climatic and anthropogenic influence on water balance. The Budyko-Zhang methodology revealed that 11 out of 26 initial catchments are characterized by low water balance disparity related to minor climatic and anthropogenic influence. These 11 catchments were suitable for identifying catchments with contrasting change in their hydroclimatic behavior using the Budyko trajectories. Our analysis further reveals that six hydrological catchment responses can be characterized by high sensitivity to climate variability and land use changes. specialized PEROU PACIFIQUE 062 032 134 1-2 139-153 2018 0177-798X https://www.documentation.ird.fr/hor/fdi:010074120 10.1007/s00704-017-2263-x 0177-798X [F B010074120] https://www.documentation.ird.fr/hor/fdi:010074120 https://www.documentation.ird.fr/intranet/publi/2018/10/010074120.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2018-11-07 2023-07-11 fdi:010074120 fre