Temporal variations in river water surface elevation and slope captured by AirSWOT
The Surface Water and Ocean Topography (SWOT) satellite mission aims to improve the frequency and accuracy of global observations of river water surface elevations (WSEs) and slopes. As part of the SWOT mission, an airborne analog, AirSWOT, provides spatially-distributed measurements of WSEs for riv...
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ftcarolinadr:cdr.lib.unc.edu:1257b327d 2023-06-11T04:09:59+02:00 Temporal variations in river water surface elevation and slope captured by AirSWOT Altenau, E.H. Pavelsky, T.M. Moller, D. Pitcher, L.H. Bates, P.D. Durand, M.T. Smith, L.C. College of Arts and Sciences, Department of Geological Sciences 2019 https://doi.org/10.17615/nsqg-ha60 https://cdr.lib.unc.edu/downloads/zc77t138p?file=thumbnail https://cdr.lib.unc.edu/downloads/zc77t138p English eng Elsevier Inc. https://doi.org/10.17615/nsqg-ha60 https://cdr.lib.unc.edu/downloads/zc77t138p?file=thumbnail https://cdr.lib.unc.edu/downloads/zc77t138p http://rightsstatements.org/vocab/InC/1.0/ Remote Sensing of Environment, 224 Remote sensing Multichannel rivers Surface Water and Ocean Topography (SWOT) AirSWOT Tanana River Arctic hydrology Article 2019 ftcarolinadr https://doi.org/10.17615/nsqg-ha60 2023-05-28T21:02:25Z The Surface Water and Ocean Topography (SWOT) satellite mission aims to improve the frequency and accuracy of global observations of river water surface elevations (WSEs) and slopes. As part of the SWOT mission, an airborne analog, AirSWOT, provides spatially-distributed measurements of WSEs for river reaches tens to hundreds of kilometers in length. For the first time, we demonstrate the ability of AirSWOT to consistently measure temporal dynamics in river WSE and slope. We evaluate data from six AirSWOT flights conducted between June 7–22, 2015 along a ~90 km reach of the Tanana River, AK. To validate AirSWOT measurements, we compare AirSWOT WSEs and slopes against an in situ network of 12 pressure transducers (PTs). Assuming error-free in situ data, AirSWOT measurements of river WSEs have an overall root mean square difference (RMSD) of 11.8 cm when averaged over 1 km2 areas while measurements of river surface slope have an RMSD of 1.6 cm/km for reach lengths >5 km. AirSWOT is also capable of recording accurate river WSE changes between flight dates, with an RMSD of 9.8 cm. Regrettably, observed in situ slope changes that transpired between the six flights are well below AirSWOT's accuracy, limiting the evaluation of AirSWOT's ability to capture temporal changes in slope. In addition to validating the direct AirSWOT measurements, we compare discharge values calculated via Manning's equation using AirSWOT WSEs and slopes to discharge values calculated using PT WSEs and slopes. We define or calibrate the remaining discharge parameters using a combination of in situ and remotely sensed observations, and we hold these remaining parameters constant between the two types of calculations to evaluate the impact of using AirSWOT versus the PT observations of WSE and slope. Results indicate that AirSWOT-derived discharge estimates are similar to the PT-derived discharge estimates, with an RMSD of 13.8%. Additionally, 42% of the AirSWOT-based discharge estimates fall within the PT discharge estimates' uncertainty ... Article in Journal/Newspaper Arctic Carolina Digital Repository (UNC - University of North Carolina) Arctic |
institution |
Open Polar |
collection |
Carolina Digital Repository (UNC - University of North Carolina) |
op_collection_id |
ftcarolinadr |
language |
English |
topic |
Remote sensing Multichannel rivers Surface Water and Ocean Topography (SWOT) AirSWOT Tanana River Arctic hydrology |
spellingShingle |
Remote sensing Multichannel rivers Surface Water and Ocean Topography (SWOT) AirSWOT Tanana River Arctic hydrology Altenau, E.H. Pavelsky, T.M. Moller, D. Pitcher, L.H. Bates, P.D. Durand, M.T. Smith, L.C. Temporal variations in river water surface elevation and slope captured by AirSWOT |
topic_facet |
Remote sensing Multichannel rivers Surface Water and Ocean Topography (SWOT) AirSWOT Tanana River Arctic hydrology |
description |
The Surface Water and Ocean Topography (SWOT) satellite mission aims to improve the frequency and accuracy of global observations of river water surface elevations (WSEs) and slopes. As part of the SWOT mission, an airborne analog, AirSWOT, provides spatially-distributed measurements of WSEs for river reaches tens to hundreds of kilometers in length. For the first time, we demonstrate the ability of AirSWOT to consistently measure temporal dynamics in river WSE and slope. We evaluate data from six AirSWOT flights conducted between June 7–22, 2015 along a ~90 km reach of the Tanana River, AK. To validate AirSWOT measurements, we compare AirSWOT WSEs and slopes against an in situ network of 12 pressure transducers (PTs). Assuming error-free in situ data, AirSWOT measurements of river WSEs have an overall root mean square difference (RMSD) of 11.8 cm when averaged over 1 km2 areas while measurements of river surface slope have an RMSD of 1.6 cm/km for reach lengths >5 km. AirSWOT is also capable of recording accurate river WSE changes between flight dates, with an RMSD of 9.8 cm. Regrettably, observed in situ slope changes that transpired between the six flights are well below AirSWOT's accuracy, limiting the evaluation of AirSWOT's ability to capture temporal changes in slope. In addition to validating the direct AirSWOT measurements, we compare discharge values calculated via Manning's equation using AirSWOT WSEs and slopes to discharge values calculated using PT WSEs and slopes. We define or calibrate the remaining discharge parameters using a combination of in situ and remotely sensed observations, and we hold these remaining parameters constant between the two types of calculations to evaluate the impact of using AirSWOT versus the PT observations of WSE and slope. Results indicate that AirSWOT-derived discharge estimates are similar to the PT-derived discharge estimates, with an RMSD of 13.8%. Additionally, 42% of the AirSWOT-based discharge estimates fall within the PT discharge estimates' uncertainty ... |
author2 |
College of Arts and Sciences, Department of Geological Sciences |
format |
Article in Journal/Newspaper |
author |
Altenau, E.H. Pavelsky, T.M. Moller, D. Pitcher, L.H. Bates, P.D. Durand, M.T. Smith, L.C. |
author_facet |
Altenau, E.H. Pavelsky, T.M. Moller, D. Pitcher, L.H. Bates, P.D. Durand, M.T. Smith, L.C. |
author_sort |
Altenau, E.H. |
title |
Temporal variations in river water surface elevation and slope captured by AirSWOT |
title_short |
Temporal variations in river water surface elevation and slope captured by AirSWOT |
title_full |
Temporal variations in river water surface elevation and slope captured by AirSWOT |
title_fullStr |
Temporal variations in river water surface elevation and slope captured by AirSWOT |
title_full_unstemmed |
Temporal variations in river water surface elevation and slope captured by AirSWOT |
title_sort |
temporal variations in river water surface elevation and slope captured by airswot |
publisher |
Elsevier Inc. |
publishDate |
2019 |
url |
https://doi.org/10.17615/nsqg-ha60 https://cdr.lib.unc.edu/downloads/zc77t138p?file=thumbnail https://cdr.lib.unc.edu/downloads/zc77t138p |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Remote Sensing of Environment, 224 |
op_relation |
https://doi.org/10.17615/nsqg-ha60 https://cdr.lib.unc.edu/downloads/zc77t138p?file=thumbnail https://cdr.lib.unc.edu/downloads/zc77t138p |
op_rights |
http://rightsstatements.org/vocab/InC/1.0/ |
op_doi |
https://doi.org/10.17615/nsqg-ha60 |
_version_ |
1768384039143604224 |