Title: Surface deformation near the All American Canal due to groundwater extraction monitored with satellite remote sensing
1Surface deformation near the All American Canal
due to groundwater extraction monitored with
satellite remote sensing
Rick Forster Joo-Yup Han Desmond Moser Jorge
Ramirez
2All American Canal Seepage is supplying
groundwater pumped in the Mexicali Valley
ASTER image aboard NASAs Terra satellite on
August 21st 2002 (R band 3, G band 2, and B
band 1)
3(No Transcript)
4Lining section Pilot Knob Hydroelectric
Generation Station to Drop 3
ASTER image aboard NASAs Terra satellite on
August 21st 2002 (R band 3, G band 2, and B
band 1)
5Ground subsidence measured with Interferometric
Synthetic Aperture Radar (InSAR)
http//edc.usgs.gov/Tectonic/tectonics_main.htm
6Example interferogram (May 1996 to Dec. 1996)
7SAR data acquisitions from ERS-1 and ERS-2 used
to generate interferograms
8Processing flowchart for generation of
interferograms and deformation map
9 A vertical displacement map derived from
the full stack of 30 interferograms (19922001)
10Images separated to test change detection of
subsidence maps
11 Change in vertical displacement 1992/97
minus 1996/2001
12Details of subsidence changes
13East Mesa Geothermal Field changes in net
production
14Subsidence transects crossing the All American
and East Highline Canals
15Details of subsidence changes along the All
American Canal
16Subsidence changes along the East Highline Canal
17Conclusions and Future Research
- The traditional InSAR technique can measure mm/yr
subsidence rates in the mesa areas surrounding
the All American Canal, but not in the
agricultural areas. - There is no significant subsidence near the AAC
due to agricultural pumping. - The subsidence bowl from the EMGF extends to the
ACC and EHC, but is not influential. - Changes in subsidence rate are detectable with
traditional InSAR - A more recent InSAR technique, permanent
scatterers (PSInSAR) can be used to measure
subsidence in the agricultural area of the
Mexicali Valley from groundwater seepage changes
after the lining of the AAC
18Improved InSAR method of measuring subsidence
changes due to lining of the All American Canal