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| Titel |
Hydro-physical processes at the plunge point: an analysis using satellite and in situ data |
| VerfasserIn |
A. T. Assireu, E. Alcântara, E. M. L. M. Novo, F. Roland, F. S. Pacheco, J. L. Stech, J. A. Lorenzzetti |
| 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 ; 15, no. 12 ; Nr. 15, no. 12 (2011-12-09), S.3689-3700 |
| Datensatznummer |
250013050
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| Publikation (Nr.) |
 copernicus.org/hess-15-3689-2011.pdf |
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| Zusammenfassung |
| The plunge point is the main mixing point between river and epilimnetic
reservoir water. Plunge point monitoring is essential for understanding the
behavior of density currents and their implications for reservoir. The use
of satellite imagery products from different sensors (Landsat TM band 6
thermal signatures and visible channels) for the characterization of the
river-reservoir transition zone is presented in this study. It is
demonstrated the feasibility of using Landsat TM band imagery to discern the
subsurface river plumes and the plunge point. The spatial variability of the
plunge point evident in the hydrologic data illustrates the advantages of
synoptic satellite measurements over in situ point measurements alone to
detect the river-reservoir transition zone. During the dry season, when the
river-reservoir water temperature differences vanish and the river
circulation is characterized by interflow-overflow, the river water inserts
into the upper layers of the reservoir, affecting water quality. The results
indicate a good agreement between hydrologic and satellite data and that the
joint use of thermal and visible channel data for the operational monitoring
of a plunge point is feasible. The deduced information about the density
current from this study could potentially be assimilated into numerical
models and hence be of significant interest for environmental and
climatological research. |
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