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Earth Surface & Interior

Proposal Summary: Impacts of Gulf Coast Subsidence, Insight for Decision Makers from InSAR, Geodesy, and Geophysical Modeling Hurricanes Katrina and Rita in 2005, and Ike in 2008, focused attention on the fact that subsidence in New Orleans and along the Gulf Coast is incompletely understood and inadequately monitored. Regional economic vitality is critically dependent upon this as we face future hurricanes and sea-level rise. Improvement in measuring and monitoring of subsidence rates, temporal variability, and geographic distribution, is not only an interesting scientific challenge, it is necessary for long term protection of lives and property. Gulf of Mexico Alliance priorities such as wetland and coastal restoration require accurate subsidence estimates. An integrated geophysical approach is the only way to resolve conflicting interpretations and gain physical insight into the processes. Recently, we demonstrated the potential of geodetically constrained geophysical modeling for understanding Gulf Coast geophysics (Ivins, et. al., 2007). Here, we propose to continue integration of geophysical modeling with geodetic measurements from traditional survey methods, GPS, and now to integrate InSAR (Interferometric Synthetic Aperture Radar) data, both from satellites and NASA's new UAVSAR system ( http://uavsar.jpl.nasa.gov/) . InSAR is the only method that can provide geographically comprehensive mapping of elevation changes on a regional scale. The NRC Decadal Survey DESDynI Mission will carry an InSAR system capable of providing very frequent comprehensive regional mapping of elevation changes if the data are integrated into local geodetic control. The combination of InSAR, GPS, and other geodetic data tied to a verified vertical datum (NAVD 88) constrained by geophysical models of the Gulf Coast is a powerful framework from which to continuously measure and predict regional to local subsidence effects providing quantitative input for decision makers. Co-Investigator Dokka, Director of the Center for GeoInformatics at LSU, has a long working relationship with NOAA and NGS, directly connecting results of this work to decision makers ( http://geoinfo.lsu.edu/joomla/ ).

Project PI: Ronald Blom/Jet Propulsion Laboratory

Jet Propulsion Laboratory M/S 300-233 4800 Oak Grove Drive Pasadena, CA 91109

Phone: (818) 354-4681

Fax: (818) 354-9476

Email: ronald.blom@jpl.nasa.govĀ 

http://science.jpl.nasa.gov/people/Blom/

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Started: Sep 27, 2010

Last Activity: Jan 04, 2011

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