Louisiana wetland water level monitoring using retracked TOPEX/POSEIDON altimetry

Hyongki Lee, C. K. Shum, Yuchan Yi, Motomu Ibaraki, Jin Woo Kim, Alexander Braun, Chung Yen Kuo, Zhong Lu

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


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 ~660 m 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.

Original languageEnglish
Pages (from-to)284-302
Number of pages19
JournalMarine Geodesy
Issue number3
Publication statusPublished - 2009 Jul 1

All Science Journal Classification (ASJC) codes

  • Oceanography

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