Masafu, C., Williams, R. and Hurst, M. D. (2023) Satellite video remote sensing for estimation of river discharge. Geophysical Research Letters, 50(24), e2023GL105. (doi: 10.1029/2023GL105839)
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Abstract
We demonstrate that river discharge can be estimated by deriving water surface velocity estimates from satellite-derived video imagery when combined with high-resolution topography of channel geometry. Large Scale Particle Image Velocimetry (LSPIV) was used to map surface velocity from 28 s of 5 Hz satellite video acquired at a 1.2 m nominal ground spacing over the Darling River, Tilpa, Australia, during a 1-in-5-year flood. We stabilized and assessed the uncertainty of the residual motion induced by the satellite platform, enhancing our sub-pixel motion analysis, and quantified the sensitivity of image extraction rates on computed velocities. In the absence of in situ observations, LSPIV velocity estimates were validated against predictions from a calibrated 2D hydrodynamic model. Despite the confounding influence of selecting a surface velocity depth-averaging coefficient, inference of discharge was within 0.3%–15% compared with gauging station measurements. These results provide a valuable foundation for refining satellite video LSPIV techniques.
Item Type: | Articles |
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Additional Information: | Christopher Masafu was funded by the Lord Kelvin Adam Smith (LKAS) PhD scholarship at the University of Glasgow. |
Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Masafu, Mr Christopher and Williams, Professor Richard and Hurst, Dr Martin |
Creator Roles: | Masafu, C.Conceptualization, Methodology, Formal analysis, Investigation, Data curation, Writing – original draft, Writing – review and editing, Visualization Williams, R.Conceptualization, Methodology, Data curation, Writing – review and editing, Supervision Hurst, M.Writing – review and editing, Supervision |
Authors: | Masafu, C., Williams, R., and Hurst, M. D. |
College/School: | College of Science and Engineering > School of Geographical and Earth Sciences |
Journal Name: | Geophysical Research Letters |
Publisher: | Wiley for the American Geophysical Union |
ISSN: | 0094-8276 |
ISSN (Online): | 1944-8007 |
Copyright Holders: | Copyright © 2023 The Authors |
First Published: | First published in Geophysical Research Letters 50(24):e2023GL105839 |
Publisher Policy: | Reproduced under a Creative Commons licence |
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