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Dendrohydrology and water resources management in south-central Chile: lessons from the Rio Imperial streamflow reconstruction

descriptionPublicationkeyboard_double_arrow_right Article , Journal 28 Aug 2017 Italy, Argentina, Netherlands, Chile Publisher:Copernicus GmbHJournal:Hydrology and Earth System Sciences, volume 22, pages 2,921-2,935 (eissn: 1607-7938,

Authors: Raffaele Vignola; David J. Sauchyn; Sebastián Andrés Crespo; Alfonso Fernández; Mauro E. González; Álvaro González-Reyes; Paulina Puchi; +7 Authors

doi: 10.5194/hess-22-2921-2018 , 10.5194/hess-2017-478

handle: 11336/88449 , 11577/3276117

Dendrohydrology and water resources management in south-central Chile: lessons from the Rio Imperial streamflow reconstruction

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Abstract

Abstract. Streamflow in south-central Chile (SCC, ∼ 37–42∘ S) is vital for agriculture, forestry production, hydroelectricity, and human consumption. Recent drought episodes have generated hydrological deficits with damaging effects on these activities. This region is projected to undergo major reductions in water availability, concomitant with projected increases in water demand. However, the lack of long-term records hampers the development of accurate estimations of natural variability and trends. In order to provide more information on long-term streamflow variability and trends in SCC, here we report findings of an analysis of instrumental records and a tree-ring reconstruction of the summer streamflow of the Río Imperial (∼ 37∘ 40′ S–38∘ 50′ S). This is the first reconstruction in Chile targeted at this season. Results from the instrumental streamflow record (∼ 1940 onwards) indicated that the hydrological regime is fundamentally pluvial with a small snowmelt contribution during spring, and evidenced a decreasing trend, both for the summer and the full annual record. The reconstruction showed that streamflow below the average characterized the post-1980 period, with more frequent, but not more intense, drought episodes. We additionally found that the recent positive phase of the Southern Annular Mode has significantly influenced streamflow. These findings agree with previous studies, suggesting a robust regional signal and a shift to a new hydrological scenario. In this paper, we also discuss implications of these results for water managers and stakeholders; we provide rationale and examples that support the need for the incorporation of tree-ring reconstructions into water resources management.

Countries

Italy, Argentina, Netherlands, Chile

Related Organizations

University of Concepción
Chile
University of Pavia
Italy
National Scientific and Technical Research Council
Argentina
University of Padua
Italy
University of Genoa
Italy

View all View all

Keywords

Technology, SOUTH-CENTRAL CHILE, 330, WATER RESOURCES MANAGEMENT, DENDROHYDROLOGY, Desarrollo de recursos hídricos - Chile, Caudal del río, Environmental technology. Sanitary engineering, Economía, G, https://purl.org/becyt/ford/1.5, Geography. Anthropology. Recreation, Life Science, GE1-350, Water Science and Technology; Earth and Planetary Sciences (miscellaneous), Silvicultura, https://purl.org/becyt/ford/1, TD1-1066, T, Environmental sciences, RÍO IMPERIAL

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	citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).	23
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