River Monitoring from Satellite Radar Altimetry in the Zambezi River Basin

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dc.contributor.author Michailovsky, C. en
dc.contributor.author McEnnis, S. en
dc.contributor.author Berry, P. A. M. en
dc.contributor.author Smith, R. G. en
dc.contributor.author Bauer-Gottwein, P. en
dc.date.accessioned 2012-08-24T14:04:55Z
dc.date.available 2012-08-24T14:04:55Z
dc.date.issued 2012-07
dc.identifier.citation Michailovsky, C., McEnnis, S., Berry, P.A.M., Smith, R. and Bauer-Gottwein, P. (2012) River Monitoring from Satellite Radar Altimetry in the Zambezi River Basin. Hydrology and Earth System Sciences, 9, (3) pp. 3203-3235 en
dc.identifier.issn 10275606
dc.identifier.uri http://hdl.handle.net/2086/6936
dc.description.abstract 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 80m wide with an RMSE relative to in situ levels of 0.32 to 0.72m 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. en
dc.language.iso en en
dc.publisher Copernicus Publications en
dc.title River Monitoring from Satellite Radar Altimetry in the Zambezi River Basin en
dc.type Article en
dc.identifier.doi http://dx.doi.org/10.5194/hessd-9-3203-2012
dc.researchgroup Earth and Planetary Remote Sensing Laboratory (EAPRS) en


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