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| Titel |
Multidecadal change in streamflow associated with anthropogenic disturbances in the tropical Andes |
| VerfasserIn |
A. Molina, V. Vanacker, E. Brisson, D. Mora, V. Balthazar |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 10 ; Nr. 19, no. 10 (2015-10-20), S.4201-4213 |
| Datensatznummer |
250120828
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| Publikation (Nr.) |
 copernicus.org/hess-19-4201-2015.pdf |
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| Zusammenfassung |
| Andean headwater catchments are an important source of freshwater for
downstream water users. However, few long-term studies exist on the relative
importance of climate change and direct anthropogenic perturbations on flow
regimes in these catchments. In this paper, we assess change in streamflow
based on long time series of hydrometeorological data (1974–2008) and land
cover reconstructions (1963–2009) in the Pangor catchment (282 km2)
located in the tropical Andes. Three main land cover
change trajectories can be distinguished during the period 1963–2009:
(1) expansion of agricultural land by an area equal to 14 % of the catchment
area (or 39 km2) in 46 years' time, (2) deforestation of
native forests by 11 % (or −31 km2) corresponding to a
mean rate of 67 ha yr−1, and (3) afforestation with exotic species in
recent years by about 5 % (or 15 km2). Over the time
period 1963–2009, about 50 % of the 64 km2 of native
forests was cleared and converted to agricultural land. Given the strong
temporal variability of precipitation and streamflow data related to El
Niño–Southern Oscillation, we use empirical mode decomposition
techniques to detrend the time series. The long-term increasing trend in
rainfall is remarkably different from the observed changes in streamflow,
which exhibit a decreasing trend. Hence, observed changes in streamflow are
not the result of long-term change in precipitation but very likely result
from anthropogenic disturbances associated with land cover change. |
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