NASA is partnering with the California Department of Water Resources (DWR) to
develop and apply new technology and products to better manage and monitor the
state's water resources and respond to its ongoing drought.
NASA scientists, DWR water managers, university researchers and other state
resource management agencies will collaborate to apply advanced remote sensing
and improved forecast modeling to better assess water resources, monitor drought
conditions and water supplies, plan for drought response and mitigation, and
measure drought impacts.
"Over the past two decades, NASA has developed capabilities to measure and
provide useful information for all components of Earth's freshwater resources
worldwide," said Michael Freilich, director of NASA's Earth Science Division in
Washington. "Working with partners like DWR, we are leveraging NASA's unique
Earth monitoring tools and science expertise to help managers address the
state's water management challenges."
In January, Gov. Edmund G. Brown Jr. declared a drought state of emergency
and directed state officials to take all necessary actions to prepare for water
shortages as 2014 shapes up to be one of the driest years on record in
California.
NASA and DWR began exploring opportunities to apply remote sensing data and
research to the process of water resource management through a partnership
established with funding from the 2009 American Recovery and Reinvestment Act.
Ongoing collaborations include monitoring California delta levees; mapping
fallowed agricultural lands; and improving estimates of precipitation, water
stored in winter snowpack, and changes in groundwater resources. The agencies
also are working to combine data from NASA satellites and DWR's network of
agricultural weather stations to improve estimates of crop water requirements
for California farmers seeking to better manage irrigation.
"We value the partnership with NASA and the ability of their remote sensing
resources to integrate data over large spatial scales, which is useful for
assessing drought impacts," said Jeanine Jones, Interstate Water Resources
Manager, DWR, Sacramento, Calif. "Early detection of land subsidence hot spots,
for example, can help forestall long-term damage to water supply and flood
control infrastructure."
In April, NASA and DWR will resume flights of NASA's Airborne Snow
Observatory to map the snowpack of the Tuolumne River Basin in the Sierra Nevada
and the Uncompahgre watershed in the Upper Colorado River Basin. The Tuolumne
watershed is the primary water supply for 2.6 million San Francisco Bay Area
residents.
The airborne observatory measures how much water is in the snowpack and how
much sunlight the snow absorbs, which affects how fast the snow melts. These
data enable accurate estimates of how much water will flow out of a basin when
the snow melts. Last year, observatory data helped water managers optimize
reservoir filling and more efficiently allocate water between power generation,
water supplies and ecological uses.
Another pilot project is demonstrating the feasibility of using satellite
imagery to track the extent of fallowed land -- cultivated land intentionally
allowed to lie idle during growing season -- in California's Central Valley.
NASA is working with DWR, the U.S. Department of Agriculture, the U.S.
Geological Survey (USGS) and California State University at Monterey Bay to
establish an operational fallowed land monitoring service as part of a
California drought early warning information system. New methods using
time-series of crop data from NASA and USGS satellites can provide information
on land fallowing and reductions in planted acreage early in the year. The team
is preparing to produce data and maps of fallowed acreage in the Central Valley
beginning this April to help monitor the impacts of the ongoing drought.
Faced with an inability to fully irrigate their crops due to drought, Central
Valley farmers often must prioritize use of limited available water supplies to
sustain perennial crops. Taking land out of production reduces farm income and
agricultural sales and increases unemployment. Timely and accurate knowledge of
the extent of fallowing can give decision makers vital insights into the
severity of drought impacts and provide a basis for sound drought response
decisions.
Another NASA project mapped areas of subsidence, or ground sinking, in the
San Joaquin Valley from 2007 to 2011 caused by decreased groundwater levels.
Groundwater is increasingly important in water resource management, yet
knowledge of groundwater levels is not uniformly available. Satellite-based and
airborne interferometric synthetic aperture radar can monitor groundwater levels
by measuring surface deformation due to the withdrawal and recharge of
aquifers.
Satellite radar maps produced to date reveal significant areas of subsidence.
NASA produced regional maps of the rate and total amount of subsidence, along
with animations and detailed histories of individual locations that can help
researchers deduce year-to-year changes in groundwater storage. Researchers hope
to extend the data to the present day to give state water managers updates on
how subsidence has progressed during the drought and detect possible new areas
of concern. The data can be used to focus on problem areas where too much water
is being pumped. The maps also help managers of infrastructure that can be
affected by subsidence, such as aqueducts, flood-control channels and the
California High-Speed Rail Authority.
NASA is teaming with DWR, University of California at San Diego and others to
conduct airborne campaigns, satellite studies and analyses of weather and
climate models to enhance understanding and improve forecasts of atmospheric
rivers. These narrow, low-altitude, elongated corridors of water vapor account
for most major flooding events, provide about 40 percent of California's
freshwater, and often are "drought busters." They help scientists understand and
predict the global water cycle and its regional extremes.
NASA satellite data and modeling studies have contributed to a better
description and understanding of the Madden-Julian Oscillation, a recurring
pattern of tropical weather and climate that impacts weather in Earth's
mid-latitudes, including California. Weather forecast models now demonstrate the
ability to forecast this pattern as much as four weeks in advance, potentially
providing new, long-lead precipitation forecast information for California. The
NASA team is working with the global weather and climate forecast communities to
enable and improve routine forecasts of this phenomenon.
Three of the five new Earth science missions NASA is scheduled to launch this
year will contribute to water cycle research and water-related national policy
decisions.
The Global Precipitation Measurement (GPM) Core Observatory, a joint
satellite project with the Japan Aerospace Exploration Agency scheduled for
launch Thursday, Feb. 27, will inaugurate an unprecedented international
satellite constellation that will produce the first nearly global observations
of rainfall and snowfall. The new information will help answer questions about
our planet's life-sustaining water cycle, and improve water resource management
and weather forecasting.
ISS-RapidScat, scheduled to launch to the International Space Station (ISS)
in June, will extend the data record of ocean winds around the globe. The data
are a key factor in climate research, weather and marine forecasting and
tracking of storms and hurricanes.
The Soil Moisture Active Passive (SMAP), launching in November, will inform
water resource management decisions on water availability. SMAP data also will
aid in predictions of plant growth and agricultural productivity, improve
short-term weather forecasts and long-term climate change projections, and
advance our ability to monitor droughts and predict floods and mitigate their
related impacts on people's lives.
NASA also plans to launch four additional water-related satellites in the
next seven years: The Ice, Cloud, and land Elevation Satellite-2 (ICESat-2);
Gravity Recovery and Climate Experiment (GRACE) Follow-on; Surface Water Ocean
Topography mission; and the NASA-Indian Space Research Organisation Synthetic
Aperture Radar mission. These satellite missions join more than a dozen NASA
airborne sensors focused on regional-scale issues, understanding detailed Earth
science processes and calibrating and validating NASA satellites.
NASA monitors Earth's vital signs from land, air and space with a fleet of
satellites and ambitious airborne and ground-based observation campaigns. NASA
develops new ways to observe and study Earth's interconnected natural systems
with long-term data records and computer analysis tools to better see how our
planet is changing. The agency shares this unique knowledge with the global
community and works with institutions in the United States and around the world
that contribute to understanding and protecting our home planet.