Delta-X

The Delta-X mission seeks to answer this science question: What are the hydrological and ecological processes responsible for the resilience and vulnerability of river deltas to Relative Sea Level Rise (RSLR), and what are their relative contributions to soil elevation?

The mission’s objectives are to evaluate the roles of:
1. Vegetation on soil accretion rates
2. Channel-network density and deltaic island size on soil accretion rates

 

After COVID-19 Delay, Delta-X Field Campaign Begins in Louisiana

Teams are headed out by land, water, and air to collect data that will be used to forecast land gain and loss in the Mississippi River Delta as a result of sea level rise.

NASA Prepares for New Science Flights Above Coastal Louisiana

Delta-X, a new NASA airborne investigation, is preparing to embark on its first field campaign in the Mississippi River Delta in coastal Louisiana.

NASA Embarks on Five U.S. Expeditions Targeting Air, Land and Sea

NASA is sending five airborne campaigns across the United States in 2020 to investigate fundamental processes that ultimately impact human lives and the environment, from snowstorms along the East Coast to ocean eddies off the coast of San Francisco.

Uninhabited Aerial Vehicle Synthetic Aperture Radar

UAVSAR, a reconfigurable, polarimetric L-band synthetic aperture radar (SAR), is specifically designed to acquire airborne repeat track SAR data for differential interferometric measurements.

Differential interferometry can provide key deformation measurements, and is important for studies of earthquakes, volcanoes and other dynamically changing phenomena.

Using precision real-time GPS and a sensor controlled flight management system, the system can fly predefined paths with great precision (to be within a 10 m diameter tube about the desired flight track).

The radar is designed to be operable on a UAV (Uninhabited Aerial Vehicle), but will initially be demonstrated on a NASA Gulfstream III. The radar is fully polarimetric, with a range bandwidth of 80 MHz (2 m range resolution), and a range swath greater than 16 km.

The antenna may be electronically steered along track to assure that the antenna beam can be directed independently, regardless of speed and wind direction.

Other features supported by the antenna include elevation monopulse and pulse-to-pulse re-steering capabilities that will enable some novel modes of operation. The system will nominally operate at 41,000 ft (13800 m).

The program began as an Instrument Incubator Project (IIP) funded by NASA Earth Science Technology Office (ESTO). Since 2018, UAVSAR facility instrument suite has been enhanced with two additional bands: P-band (AirMOSS) and Ka-band (GLISTIN-A). The P-band capability was originally added in 2012 to support the EVS-1 AirMOSS mission to observe sub-canopy and subsurface root zone soil moisture. The modification was accomplished by replacing UAVSAR's L-band front-end electronics and antenna with components that operate at P-band (420-440 MHz). The Ka-band single-pass interferometric SAR capability (GLISTIN-A) was added through NASA's Advanced Instrument Technology Transition program (AITT). The horizontally polarized GLISTIN-A (35.62-35.70 GHz) instrument generates high-precision, high resolution, large-swath digital surface models for ice surface topography mapping.

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