Title | ||
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Inferring Water Table Depth Dynamics from ENVISAT-ASAR C-Band Backscatter over a Range of Peatlands from Deeply-Drained to Natural Conditions. |
Abstract | ||
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Water table depth (WTD) is one of the key variables controlling many processes in peatlands. Reliable WTD estimates based on remote sensing data would advance peatland research from global-scale climate monitoring to field-scale ecosystem management. Here, we evaluate the relationship between ENVISAT Advanced Synthetic Aperture Radar (ASAR) C-band backscatter (sigma degrees) and in situ observed WTD dynamics over 17 peatlands in Germany covering deeply-drained to natural conditions, excluding peatlands dominated by forest or inundation periods. The results show increasing sigma degrees with shallower WTD (= wetter conditions), with average temporal Pearson correlation coefficients of 0.38 and 0.54 (-) for natural (also including disturbed and rewetted/restored states) and agriculturally-used drained peatlands, respectively. The anomaly correlation further highlights the potential of ASAR backscatter to capture interannual variations with values of 0.33 and 0.43 (-), for natural and drained peatlands. The skill metrics, which are similar to those for evaluations of top soil moisture from C-band over mineral soils, indicate a strong capillary connection between WTD and the ' C-band-sensitive' top 1-2 cm of peat soils, even during dry periods with WTD at around -1 m. Various backscatter processing algorithms were tested without significant differences. The cross-over angle concept for correcting dynamical vegetation effects was tested, but not superior, to constant incidence angle correction. |
Year | DOI | Venue |
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2018 | 10.3390/rs10040536 | REMOTE SENSING |
Keywords | Field | DocType |
SAR,peatland,bog,fen,wetland,drainage,water table depth,soil moisture,backscatter,cross-over angle | Peat,Vegetation,Backscatter,Remote sensing,Wetland,Atmospheric sciences,Water content,Water table,Geology,Topsoil,Soil water | Journal |
Volume | Issue | Citations |
10 | 4 | 0 |
PageRank | References | Authors |
0.34 | 6 | 4 |
Name | Order | Citations | PageRank |
---|---|---|---|
M. Bechtold | 1 | 1 | 2.44 |
Stefan Schlaffer | 2 | 30 | 4.31 |
Bärbel Tiemeyer | 3 | 0 | 1.01 |
Gabrielle J. M. De Lannoy | 4 | 15 | 4.15 |