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Dendrohydrology and water resources management in South-Central Chile: Lessons from the Río Imperial streamflow reconstruction

Authors: Alfonso Fernández; Ariel A. Muñoz; Álvaro González-Reyes; Isabella Aguilera-Betti; Isadora Toledo; Paulina Puchi; David J. Sauchyn; +5 Authors

Dendrohydrology and water resources management in South-Central Chile: Lessons from the Río Imperial streamflow reconstruction

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. Fil: Fernández, Alfonso. Universidad de Concepción; Chile Fil: Muñoz, Ariel. Pontificia Universidad Católica de Valparaíso; Chile Fil: González Reyes, Álvaro. Universidad Austral de Chile; Chile Fil: Aguilera Betti, Isabella. Pontificia Universidad Católica de Valparaíso; Chile Fil: Toledo, Isadora. Pontificia Universidad Católica de Valparaíso; Chile Fil: Puchi, Paulina. Pontificia Universidad Católica de Valparaíso; Chile Fil: Sauchyn, David. University of Regina; Canadá Fil: Crespo, Sebastián Andrés. Pontificia Universidad Católica de Valparaíso; Chile Fil: Frene, Cristian. Pontificia Universidad Católica de Chile; Chile Fil: Mundo, Ignacio Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina Fil: González, Mauro. Universidad Austral de Chile; Chile Fil: Vignola, Raffaele. Cátedra Latinoamericana en Decisiones Ambientales para el Cambio Global; Costa Rica

Countries
Argentina, Italy, Netherlands
Subjects by Vocabulary

Library of Congress Subject Headings: lcsh:Technology lcsh:TD1-1066 lcsh:Environmental technology. Sanitary engineering lcsh:Environmental sciences lcsh:GE1-350 lcsh:T lcsh:Geography. Anthropology. Recreation lcsh:G

Microsoft Academic Graph classification: Hydroelectricity Streamflow Natural variability business.industry Water resources Pluvial Agriculture Climatology Snowmelt Period (geology) Environmental science business

Keywords

SOUTH-CENTRAL CHILE, WATER RESOURCES MANAGEMENT, DENDROHYDROLOGY, Ciencias de la Tierra y relacionadas con el Medio Ambiente, //purl.org/becyt/ford/1 [https], //purl.org/becyt/ford/1.5 [https], Earth and Planetary Sciences (miscellaneous), Life Science, Water Science and Technology; Earth and Planetary Sciences (miscellaneous), Water Science and Technology, Oceanografía, Hidrología, Recursos Hídricos, RÍO IMPERIAL, CIENCIAS NATURALES Y EXACTAS

60 references, page 1 of 6

Abram, N. J., Mulvaney, R., Vimeux, F., Phipps, S. J., Turner, J., and England, M. H.: Evolution of the Southern Annular Mode during the past millennium, Nat. Clim. Change, 4, 564-569, 2014. [OpenAIRE]

Aravena, J.-C. and Luckman, B. H.: Spatio-temporal rainfall patterns in Southern South America, Int. J. Climatol., 21, 2106- 2120, https://doi.org/10.1002/joc, 2009.

Ayala-Cabrera y Asociados: Plan Director para la Gestión de los Recursos Hídricos en la Cuenca del Río Imperial, Dirección General de Aguas, Ministerio de Obras Públicas, Chile, 2001.

Barria, P., Peel, M. C., Walsh, K. J. E., and Muñoz, A.: The first 300-year streamflow reconstruction of a highelevation river in Chile using tree rings, Int. J. Climatol., https://doi.org/10.1002/joc.5186, 2017.

Bauer, C. J.: Results of Chilean water markets: Empirical research since 1990, Water Resour. Res., 40, 1-11, https://doi.org/10.1029/2003WR002838, 2004.

Bauer, C. J.: Water Conflicts and Entrenched Governance Problems in Chile' s Market Model, Water Alternat., 8, 147-172, http://www.water-alternatives.org/index.php/alldoc/articles/ vol8/v8issue2/285-a8-2-8/file (last access; 10 May 2018), 2015.

Biondi, F. and Strachan, S.: Dendrohydrology in 2050: Challenges and Opportunities, in: Toward a Sustainable Water Future, 355-362, American Society of Civil Engineers, Reston, VA, https://doi.org/10.1061/9780784412077.ch38, 2012.

Blázquez, J. and Solman, S. A.: Interannual variability of the frontal activity in the Southern Hemisphere: relationship with atmospheric circulation and precipitation over southern South America, Clim. Dynam., https://doi.org/10.1007/s00382-016-3223-3, 2016.

Boisier, J. P., Rondanelli, R., Garreaud, R. D., and Muñoz, F.: Anthropogenic and natural contributions to the Southeast Pacific precipitation decline and recent megadrought in central Chile, Geophys. Res. Lett., 1-9, https://doi.org/10.1002/2015GL067265, 2016.

CADE-IDEPE: Cuenca del Río Imperial, Tech. rep., Ministerio de Obras Publicas, 2004.

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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).
    21
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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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).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
21
Top 10%
Average
Top 10%
Funded by
EC| ECOADAPT
Project
ECOADAPT
Ecosystem-based strategies and innovations in water governance networks for adaptation to climate change in Latin American Landscapes
  • Funder: European Commission (EC)
  • Project Code: 283163
  • Funding stream: FP7 | SP1 | ENV
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