Journal
MARINE GEODESY
Volume 32, Issue 3, Pages 284-302Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01490410903094767
Keywords
Satellite radar altimetry; Louisiana wetlands; water level change; waveform retracking; stackfile
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Funding
- National Geospatial-Intelligence Agency [HM1582-07-1-2024]
- National Science Foundation Hydrology [EAR-0440007]
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Previous studies using satellite radar altimetry to observe inland river and wetland water level changes usually spatially average high-rate (10-Hz for TOPEX, 18-Hz for Envisat) measurements. Here we develop a technique to apply retracking of TOPEX waveforms by optimizing the estimated retracked gate positions using the Offset Center of Gravity retracker. This study, for the first time, utilizes stacking of retracked TOPEX data over Louisiana wetland and concludes that the water level observed by each of 10-Hz data with along-track sampling of similar to 660m exhibit variations, indicating detection of wetland dynamics. After further validations using nearby river gauges, we conclude that TOPEX is capable of measuring accurate water level changes beneath heavy-vegetation canopy region ( swamp forest), and that it revealed wetland dynamic flow characteristics along track with spatial scale of 660 m or longer.
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