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hydrology-10-00144.pdf
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Author
Sangüesa, C.Pizarro, R.
Ingram, B.
Balocchi, F.
García-Chevesich, P.
Pino, J.
Ibáñez, A.
Vallejos, C.
Mendoza, R.
Bernal, A.
Valdés-Pineda, R.
Pérez, F.
Affiliation
Department of Hydrology and Atmospheric Sciences, University of ArizonaIssue Date
2023-07-07Keywords
climatic zonesMann–Kendall test
quantile–Kendall procedure
streamflows Chile
Theil–Sen estimator
time period length
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Sangüesa, C.; Pizarro, R.; Ingram, B.; Balocchi, F.; García-Chevesich, P.; Pino, J.; Ibáñez, A.; Vallejos, C.; Mendoza, R.; Bernal, A.; et al. Streamflow Trends in Central Chile. Hydrology 2023, 10, 144. https://doi.org/10.3390/hydrology10070144Journal
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© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
The availability of water in Chile has shown signs of decline in recent decades. This is problematic because Chile’s economy depends on mining, forestry, and agricultural activities, all limited by the availability of water resources. In this study, daily, monthly and annual flows in 31 basins located in the arid–semiarid zones (29°12′ S–33°58′ S) and in the humid–subhumid zones (34°43′ S–38°30′ S) of Chile were evaluated using the Mann–Kendall trend test and the quantile–Kendall procedure during three periods: 1984–2021 (31 stations), 1975–2021 (20 stations), and 1969–2021 (18 stations). Results showed that, at the annual level, trends were predominantly negative in both climatic zones and over the three periods analyzed. In the arid–semiarid zone, a higher frequency of annual significant negative trends was found in maximum flows in 1969–2021 and 1975–2021, compared to the last period under study. The humid–subhumid zone showed significant annual negative trends in all series analyzed. At the monthly level, on the other hand, the arid-semiarid zone showed a decrease in significant negative trends as the number of years analyzed increased, for all flow types. The humid–subhumid zone did not indicate a similar defined pattern. Likewise, the quantile–Kendall procedure showed a reduction in the significant trends as the length of the time series was increased in the arid-semiarid zone, but no such pattern was observed in the humid–subhumid zone. Furthermore, a relationship was observed for the PDO and the summer month flows for both zones. Consequently, it is concluded that the flow trends are generally negative, and their statistical significance depends on the period studied. © 2023 by the authors.Note
Open access journalISSN
2306-5338Version
Final Published Versionae974a485f413a2113503eed53cd6c53
10.3390/hydrology10070144
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Except where otherwise noted, this item's license is described as © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license.