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Response to Variations in River Flowrate by a Spaceborne GNSS-R River Width Estimator
Abstract
In recent years, the use of Global Navigation Satellite System-Reflectometry (GNSS-R) for remote sensing of the Earth’s surface has gained momentum as a means to exploit existing spaceborne microwave navigation systems for science-related applications. Here, we explore the potential for using measurements made by a spaceborne GNSS-R bistatic radar system (CYGNSS) during river overpasses to estimate its width, and to use that width as a proxy for river flowrate. We present a case study utilizing CYGNSS data collected in the spring of 2019 during multiple overpasses of the Pascagoula River in southern Mississippi over a range of flowrates. Our results demonstrate that a measure of river width derived from CYGNSS is highly correlated with the observed flowrates. We show that an approximately monotonic relationship exists between river flowrate and a measure of river width which we define as the associated GNSS-R width (AGW). These results suggest the potential for GNSS-R systems to be utilized as a means to estimate river flowrates and widths from space.
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Bistatic radar data contains signatures that have been used for wide-ranging Earth Science applications, including measuring ocean surface wind speeds, soil moisture, inland water body mapping, river width and surface slope estimation.
“The bistatic radar data contains signatures that have been used for wide-ranging Earth Science applications, including measuring ocean surface wind speeds [4], soil moisture [5][6][7], inland water body mapping [8][9][10][11][12][13][14][15], and river width [16] and surface slope [17] estimation.”
From Characterization of River Width Measurement Capability by Space Borne GNSS-Reflectometry (2024) · cites this paper as [16]
In a previous work [16], the waveform width during the river overpass was determined to be correlated with observed streamflow.
“The first is the waveform width during the river overpass, which in a previous work [16] was determined to be correlated with observed streamflow.”
From Characterization of River Width Measurement Capability by Space Borne GNSS-Reflectometry (2024) · cites this paper as [16]
The ability of GNSS-R measurements to resolve the width of rivers during their specular point river crossings has been expanded from previous work.
“The ability of GNSS-R measurements to resolve the width of rivers during their specular point river crossings has been expanded from previous work”
From Characterization of River Width Measurement Capability by Space Borne GNSS-Reflectometry (2024) · cites this paper as [16]
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Research works printed but not linked: 11
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- Balakhder, 2019, On the coherency of ocean and land surface specular scattering for GNSS-R and signals of opportunity systems, IEEE Trans. Geosci. Remote Sens., 57, 1, 10.1109/TGRS.2019.2935257 · DOI · Paper page
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Characterization of River Width Measurement Capability by Space Borne GNSS-Reflectometry
Warnock, A., Ruf, C. S., & Knoll, A. L. (2024) · Remote Sensing · doi:10.3390/rs16081446 · Cited by 4
Self-citation
Metadata
- Authors
- Warnock, A., & Ruf, C.
- Affiliations
- SRI International, Ann Arbor, MI 48105, USA
- Climate and Space Dept, University of Michigan, Ann Arbor, MI 48109, USA
- Venue
- Remote Sensing
- Publisher
- MDPI AG
- Published
- 2019-10-22
- Volume
- 11
- Issue
- 20
- Pages
- 2450
- ISSN
- 2072-4292
- Cited by
- 25
- References
- 0
- Language
- en
- Funders
- Earth Sciences Division (80NSSC18K0702 P00001)
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