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| Titel |
Quantifying river form variations in the Mississippi Basin using remotely sensed imagery |
| VerfasserIn |
Z. F. Miller, T. M. Pavelsky, G. H. Allen |
| 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. 12 ; Nr. 18, no. 12 (2014-12-05), S.4883-4895 |
| Datensatznummer |
250120547
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| Publikation (Nr.) |
 copernicus.org/hess-18-4883-2014.pdf |
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| Zusammenfassung |
| Geographic variations in river form are often estimated using the framework
of downstream hydraulic geometry (DHG), which links spatial changes in
discharge to channel width, depth, and velocity through power-law models.
These empirical relationships are developed from limited in situ data and do not
capture the full variability in channel form. Here, we present a data set of
1.2 ×106 river widths in the Mississippi Basin measured from the
Landsat-derived National Land Cover Dataset that characterizes width
variability observationally. We construct DHG for the Mississippi drainage
by linking digital elevation model (DEM)-estimated discharge values to each width measurement.
Well-developed DHG exists over the entire Mississippi Basin, though
individual sub-basins vary substantially from existing width–discharge
scaling. Comparison of depth predictions from traditional depth–discharge
relationships with a new model incorporating width into the DHG framework
shows that including width improves depth estimates by, on average, 24%.
Results suggest that channel geometry derived from remotely sensed imagery
better characterizes variability in river form than do estimates based on
DHG. |
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