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| Titel |
River monitoring from satellite radar altimetry in the Zambezi River basin |
| VerfasserIn |
C. I. Michailovsky, S. McEnnis, P. A. M. Berry, R. Smith, P. Bauer-Gottwein |
| 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 ; 16, no. 7 ; Nr. 16, no. 7 (2012-07-20), S.2181-2192 |
| Datensatznummer |
250013373
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| Publikation (Nr.) |
 copernicus.org/hess-16-2181-2012.pdf |
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| Zusammenfassung |
| Satellite radar altimetry can be used to monitor surface water levels from
space. While current and past altimetry missions were designed to study
oceans, retracking the waveforms returned over land allows data to be
retrieved for smaller water bodies or narrow rivers. The objective of this
study is the assessment of the potential for river monitoring from radar altimetry in terms of
water level and discharge in the Zambezi River basin. Retracked Envisat
altimetry data were extracted over the Zambezi River basin using a detailed
river mask based on Landsat imagery. This allowed for stage measurements to
be obtained for rivers down to 80 m wide with an RMSE relative to in situ
levels of 0.32 to 0.72 m at different locations. The altimetric levels were
then converted to discharge using three different methods adapted to
different data-availability scenarios: first with an in situ rating curve
available, secondly with one simultaneous field measurement of cross-section
and discharge, and finally with only historical discharge data available.
For the two locations at which all three methods could be applied, the
accuracies of the different methods were found to be comparable, with RMSE
values ranging from 4.1 to 6.5% of the mean annual in situ gauged
amplitude for the first method and from 6.9 to 13.8% for the second and
third methods. The precision obtained with the different methods was
analyzed by running Monte Carlo simulations and also showed comparable
values for the three approaches with standard deviations found between 5.7
and 7.2% of the mean annual in situ gauged amplitude for the first method
and from 8.7 to 13.0% for the second and third methods. |
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