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| Titel |
Physical changes within a large tropical hydroelectric reservoir induced by wintertime cold front activity |
| VerfasserIn |
M. P. Curtarelli, E. H. Alcântara, C. D. Rennó, J. L. Stech |
| 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 ; 18, no. 8 ; Nr. 18, no. 8 (2014-08-20), S.3079-3093 |
| Datensatznummer |
250120438
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| Publikation (Nr.) |
 copernicus.org/hess-18-3079-2014.pdf |
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| Zusammenfassung |
| We investigated the influence of wintertime cold front activity on the
physical processes within a large tropical reservoir located in Brazil. The
period chosen for this study consisted of 49 days between 28 April 2010 and
15 July 2010. This period was defined based on information from the
Brazilian Center for Weather Forecasting and Climate Studies (CPTEC), data
collected in situ and the interpretation of remotely sensed images. To
better understand the governing processes that drive changes in the heat
balance, differential cooling and mixing dynamics, a simulation was
performed that utilized a three-dimensional hydrodynamic model enforced with
in situ and remote sensing data. The results showed that during a cold front
passage over the reservoir, the sensible and latent heat fluxes were
enhanced by approximately 77 and 16%, respectively. The reservoir's
daily averaged heat loss was up to 167% higher on the days with cold
front activity than on the days without activity. The cold front passage
also intensified the differential cooling process; in some cases the
difference between the water temperature of the littoral and pelagic zones
reached up to 8 °C. The occurrence of cold front passages impacted
the diurnal mixed layer (DML), by increasing the turbulent energy input
(∼54%) and the DML depth (∼41%). Our
results indicate that the cold front events are one of the main
meteorological disturbances driving the physical processes within
hydroelectric reservoirs located in tropical South America during the
wintertime. Hence, cold front activity over these aquatic systems has
several implications for water quality and reservoir management in Brazil. |
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