Stage-Slope-Discharge Relationships Upstream of River Confluences Revealed by Satellite Altimetry

Liu，Jun1; Bauer-Gottwein，Peter1; Frias，Monica Coppo1; Musaeus，Aske Folkmann1; Christoffersen，Linda2; Jiang，Liguang3

2023-12-16

10.1029/2023GL106394

Geophysical Research Letters   影响因子和分区

0094-8276

1944-8007

With 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.

backwater effects hydraulic modeling inland water altimetry river hydraulics water surface slope

SCI ; EI

英语

NI论文

其他

WOS:001109980000001

20234815141356

Remote sensing ; Rivers ; Water

Hydraulics:632.1

GEOSCIENCES

2-s2.0-85177765860

Scopus

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

Liu，Jun,Bauer-Gottwein，Peter,Frias，Monica Coppo,et al. Stage-Slope-Discharge Relationships Upstream of River Confluences Revealed by Satellite Altimetry[J]. Geophysical Research Letters,2023,50(23).

Liu，Jun,Bauer-Gottwein，Peter,Frias，Monica Coppo,Musaeus，Aske Folkmann,Christoffersen，Linda,&Jiang，Liguang.(2023).Stage-Slope-Discharge Relationships Upstream of River Confluences Revealed by Satellite Altimetry.Geophysical Research Letters,50(23).

Liu，Jun,et al."Stage-Slope-Discharge Relationships Upstream of River Confluences Revealed by Satellite Altimetry".Geophysical Research Letters 50.23(2023).