Monitoring coastal subsidence in Miami-Dade county, Florida, using Sentinel-1 InSAR time series and GPS observations.
The increasing rate of sea level rise has affected several communities along the US Atlantic coast, periodically exposing them to flooding events. Miami has been pointed among the most vulnerable cities due to sea level rise (Melillo et al., 2014). The city historically suffers from flooding events related to high tide, heavy rain and storm surge. Recent studies show that the flooding frequency has increased in past years due to decadal-scale acceleration in the rate of sea level rise (Wdowinski et al., 2016). Miami coastal communities are densely populated. For example, The City of Miami Beach alone has density of 4637 people per square kilometer. Some of these urban settlements have been flooded periodically. The increased flooding frequency may not just reflect the contribution of global processes. Local and regional processes, as ocean dynamics and land subsidence can increment sea level rise effects on coastal communities.In this research, we evaluate the contribution of local subsidence to the increased coastal flooding hazard along the coast of Miami-Dade County using two geodetic techniques, Interferometric Synthetic Aperture Radar (InSAR) and GPS. Our SAR dataset consists of 50 Sentinel-1 images covering a time span of over a three-year period (20150921 to 20180707). We generate radar interferometry time series to detect localized areas of land subsidence along the Miami-Dade shoreline. Preliminary results of InSAR Small Baseline time series (SBAS) results show subsidence patterns along west section of Miami Beach, which coincide with locations of known flood areas. Based on the InSAR results, we will construct four continuous GPS (cGPS) stations that will provide 3-D measurements of the subsiding areas.
AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- 1225 Global change from geodesy;
- GEODESY AND GRAVITYDE: 1641 Sea level change;
- GLOBAL CHANGEDE: 4217 Coastal processes;
- OCEANOGRAPHY: GENERALDE: 4556 Sea level: variations and mean;
- OCEANOGRAPHY: PHYSICAL