Glacier recession and water resources in Peru’s Cordillera Blanca
| Autor: | Michel Baraer, Thomas Condom, César Portocarrero, Bryan G. Mark, Jeffrey Bury, Jeffrey M. McKenzie, Sarah Rathay, Kyung In Huh, Jesus Gomez |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Hydrology
geography Watershed geography.geographical_feature_category 010504 meteorology & atmospheric sciences Glacier recession 0208 environmental biotechnology Lead (sea ice) Glacier Hydrograph 02 engineering and technology 01 natural sciences 020801 environmental engineering Water resources Conservación de glaciares Hydrology (agriculture) Dry season Riesgos de disponibilidad hídrica Cambio climático Geology Monitoreo de lagunas y glaciares 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Autoridad Nacional del Agua Repositorio institucional-ANA ANA-Institucional instacron:ANA |
| Popis: | Original abstract: The tropical glaciers of the Cordillera Blanca, Peru, are rapidly retreating, resulting in complex impacts on the hydrology of the upper Río Santa watershed. The effect of this retreat on water resources is evaluated by analyzing historical and recent time series of daily discharge at nine measurement points. Using the Mann-Kendall nonparametric statistical test, the significance of trends in three hydrograph parameters was studied. Results are interpreted using synthetic time series generated from a hydrologic model that calculates hydrographs based on glacier retreat sequences. The results suggest that seven of the nine study watersheds have probably crossed a critical transition point, and now exhibit decreasing dry-season discharge. Our results suggest also that once the glaciers completely melt, annual discharge will be lower than present by 2-30% depending on the watershed. The retreat influence on discharge will be more pronounced during the dry season than at other periods of the year. At La Balsa, which measures discharge from the upper Río Santa, the glacier retreat could lead to a decrease in dry-season average discharge of 30%. Artículo en acceso abierto Menciona el rápido retroceso de los glaciares tropicales de la Cordillera Blanca, Perú, teniendo como resultados en impactos complejos en la hidrología de la cuenca alta del Río Santa. Menciona que el efecto de este retiro en los recursos hídricos se evalúa analizando series de tiempo históricas y recientes de descarga diaria en nueve puntos de medición y que se estudió la importancia de las tendencias en tres parámetros de hidrografía. Señala además, entre otros aspectos, que los resultados sugieren que una vez que los glaciares se derritan completamente, la descarga anual será más baja dependiendo de la cuenca. |
| Databáze: | OpenAIRE |
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