Space-based monitoring of water depth and soil salinity over collapsing peat marshes using Sentinel-1 SAR amplitude observations
Abstract
Peatland stores a large amount of terrestrial carbon. In coastal peatland environments, saltwater intrusions in combination of droughts are associated with peat collapse leading to peatland degradation and loss of carbon. Peatlands are often inaccessible and best monitored by remote sensing observation. We evaluated the ability of spaceborne Synthetic Aperture Radar (SAR) to monitor the effects of peat collapse on water depth and soil salinity in coastal marsh.
We studied a brackish peat marsh in the Florida Coastal Everglades experiencing collapse and salinization, using remote sensing observations and ground-based model products (Fig. 1a). The remote sensing data consisted of 32 Sentinel-1 SAR amplitude (σ° in dB unit) images from April 2016 to December 2017. We obtained ground data of daily average water depths (dw) and groundwater salinity (S) products (a proxy for soil salinity) from the Biscayne and Southern Everglades Coastal Transport (BISECT) model. We used WorldView-2 data to map three land covers: sawgrass, submerged aquatic vegetation, and open water (Fig. 1b). All products were re-sampled and aligned at a 30-m grid resolution.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMEP042..08Z
- Keywords:
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- 0497 Wetlands;
- BIOGEOSCIENCES;
- 1211 Non-tectonic deformation;
- GEODESY AND GRAVITY;
- 1632 Land cover change;
- GLOBAL CHANGE;
- 4306 Multihazards;
- NATURAL HAZARDS