Affiliation:
1. Department of Environmental and Resource Engineering Technical University of Denmark Kgs. Lyngby Denmark
2. National Space Institute Technical University of Denmark Kgs. Lyngby Denmark
3. School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China
Abstract
AbstractWith increasing coverage, density, and accuracy of the global inland water altimetry record, remote sensing observations of water surface elevation (WSE) and water surface slope (WSS) are becoming available for the world's rivers. In steady, uniform flows, WSS is invariable, while there is a unique one‐to‐one relationship between WSE and discharge, the rating curve. While the assumptions of steady uniform flow are appropriate for many rivers, they are violated upstream of river confluences. We present a simple analytical hydraulic model of river confluences using the theory of steady, gradually varied flow. We apply the model to four river confluences in the Mississippi‐Missouri river system. We determine the spatial extent of the backwater‐affected zones and map WSE‐discharge and WSS‐discharge relationships. We show that coincident measurements of WSE and WSS from new satellite altimetry missions effectively constrain discharge estimates from space in the backwater‐affected zones upstream of river confluences.
Funder
European Space Agency
HORIZON EUROPE Framework Programme
Innovationsfonden
National Key Research and Development Program of China
Publisher
American Geophysical Union (AGU)
Subject
General Earth and Planetary Sciences,Geophysics
Cited by
2 articles.
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