Drought and Land Subsidence: Monitoring from Space Tom G Farr, Cathleen Jones, Zhen Liu (Project Team) Stephanie Granger (T/PM) Jet Propulsion Laboratory California Institute of Technology [email protected][email protected]Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
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Drought and Land Subsidence:
Monitoring from Space
Tom G Farr, Cathleen Jones, Zhen Liu (Project Team) Stephanie Granger (T/PM)
Jet Propulsion Laboratory California Institute of Technology
SOURCES: Department of Water Resources (water use data, all numbers are for 1998–2010); State Water Resources Control Board (water quality).
Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
JPL
Study
Region
Groundwater pumping in dry
years
Public Policy Institute of California
SOURCES: Department of Water Resources (water use data, all numbers are for 1998–2010); State Water Resources Control Board (water quality).
Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
JPL Study Period 1
Impact of land subsidence Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
“Seeing” subsidence from space
• Groundwater is an important part of California’s water supply, especially
in a dry year and especially in the Central Valley.
• Land subsidence is a consequence of groundwater over-pumping.
• Wells provide some monitoring capability, but there are practical
difficulties and they don’t provide subsidence information.
• Interferometric Synthetic Aperture Radar (InSAR) can provide
information on land subsidence by measuring surface deformation caused
by withdrawal and recharge of aquifers.
• We are developing information products for water managers, the public,
and hydrologists including animations, maps of ‘hot spots’, pixel histories,
and regional maps of subsidence and groundwater change
Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
Interferometry 101:
deformation maps
When two observations are made from the same location in space but at different times, the interferometric phase is proportional to any change in the range of a surface feature.
Df =4p
l(r(t1) - r(t2 )) =
4p
lDrchanget1
t2
Drchange
r(t1 )r(t2 )
t1 t2
Surface Deformation Phase
Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
Monitoring L.A. basin
Paul Lundgren, Vince Realmuto, JPL
Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
Monitoring L.A. basin
Paul Lundgren, Vince Realmuto, JPL
Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
Try it yourself at:
http://webgis.irea.cnr.it/
Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
Subsidence in the Central Valley of
California: PALSAR, 2007-2011
Zhen Liu, Vince Realmuto, Tom Farr, JPL
Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
San Joaquin Valley subsidence Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
Sacramento Valley subsidence Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
Subsidence histories in San
Joaquin and Sacramento Valleys Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
CA Aqueduct and Delta-
Mendota Canal Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged
CA Aqueduct near Buttonwillow Copyright 2015 California Institute of Technology. U.S. Government sponsorship acknowledged