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Sources and pathways of stream generation in tropical proglacial valleys of the Cordillera Blanca, Peru
| dc.contributor.author | Gordon, Ryan P. | |
| dc.contributor.author | Lautz, Laura K. | |
| dc.contributor.author | McKenzie, Jeffrey M. | |
| dc.contributor.author | Mark, Bryan G. | |
| dc.contributor.author | Chávez, Daniel | |
| dc.contributor.author | Baraer, Michel | |
| dc.coverage.spatial | Cordillera Blanca | |
| dc.date.accessioned | 2018-12-31T13:11:43Z | |
| dc.date.available | 2018-12-31T13:11:43Z | |
| dc.date.issued | 2015-03 | |
| dc.identifier.citation | Gordon, R. P., Lautz, L. K., McKenzie, J. et al. (2015) Sources and pathways of stream generation in tropical proglacial valleys of the Cordillera Blanca, Peru. Journal of Hydrology, 522, 628-644. doi: https://doi.org/10.1016/j.jhydrol.2015.01.013 | es_PE |
| dc.identifier.issn | ISSN: 0022-1694, ESSN: 1879-2707 | es_PE |
| dc.identifier.uri | https://hdl.handle.net/20.500.12543/3191 | |
| dc.description | Original abstract: An inventory of the lakes within the Cordillera Blanca of Peru was made based on manual analysis of high resolution optical images and was verified during field surveys. In total, 882 lakes were detected, classified and described by several qualitative and quantitative characteristics. The majority of the lakes were characterised as moraine-dammed lakes (35.2%), followed by bedrock-dammedTropical glaciers supply approximately half of dry-season stream discharge in glacierized valleys of the Cordillera Blanca, Peru. The remainder of streamflow originates as groundwater stored in alpine meadows and other proglacial geomorphic features. A better understanding of the hydrogeology of alpine groundwater, including sources, storage zones, and the locations and magnitudes of contributions to streamflow, is important for making accurate estimates of glacial inputs to the hydrologic budget, and for our ability to make predictions about future water resources as glaciers retreat. This field study focuses on two high-elevation meadows in valleys of the Cordillera Blanca, in headwaters and mid-valley locations. Tracer measurements of stream and spring discharge and groundwater-surface water exchange were combined with synoptic sampling of water isotopic and geochemical composition in order to characterize and quantify contributions to streamflow from different groundwater reservoirs. At the headwaters site, groundwater supplied approximately half of stream discharge from a small meadow, with most originating in an alluvial fan adjacent to the meadow and little (6%) from the meadow itself; however, at the mid-valley site, where meadows are extensive, local groundwater has a large impact on streamflow and chemistry through large net contributions to discharge and turnover of surface water due to gross exchanges with groundwater. At the mid-valley site, stream discharge increased by 200 L s-1 (18% of average discharge) over 1.2 km as it descended a moraine between two meadows. Such valley-crossing moraines, which create significant steps in the down-valley slope, are likely locations of substantial groundwater contribution to streams. | es_PE |
| dc.description | Artículo en período de embargo | es_PE |
| dc.description.abstract | Menciona que los glaciares tropicales suministran aproximadamente la mitad del caudal de la estación seca en los valles glaciares de la Cordillera Blanca, Perú y que el resto del flujo de la corriente se origina como agua subterránea almacenada en praderas alpinas y otras características geomorfas proglaciales. En este contexto, señala que es importante realizar estimaciones precisas de los aportes glaciales al presupuesto hidrológico, y tener la capacidad de hacer predicciones sobre el agua en el futuro. Indica que este estudio de campo se centra en dos praderas de gran elevación en los valles de la Cordillera Blanca, en cabeceras y en las localidades del valle medio y realiza mediciones del trazador de la descarga de la corriente y el manantial y el intercambio de agua en la superficie del agua subterránea combinada con el muestreo sinóptico de la composición isotópica y geoquímica del agua para caracterizar y cuantificar las contribuciones al flujo de la corriente desde diferentes reservorios de agua subterránea. | es_PE |
| dc.format | application/pdf | es_PE |
| dc.language.iso | eng | es_PE |
| dc.publisher | Elsevier | es_PE |
| dc.relation.ispartofseries | Journal of Hydrology, March 2015, Volume 522, pp 628-644 | es_PE |
| dc.relation.uri | https://www.sciencedirect.com/science/article/pii/S0022169415000268?via%3Dihub | |
| dc.rights | info:eu-repo/semantics/closedAccess | es_PE |
| dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 International | * |
| dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
| dc.source | Autoridad Nacional del Agua | es_PE |
| dc.source | Repositorio institucional - ANA | es_PE |
| dc.subject | Hidrología | es_PE |
| dc.subject | Gestión de riesgos de desastres en recursos hídricos | es_PE |
| dc.subject | Monitoreo de lagunas y glaciares | es_PE |
| dc.title | Sources and pathways of stream generation in tropical proglacial valleys of the Cordillera Blanca, Peru | es_PE |
| dc.type | info:eu-repo/semantics/article | es_PE |
| dc.identifier.doi | https://doi.org/10.1016/j.jhydrol.2015.01.013 | es_PE |
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