24 July 2002 Work In Progress – Not for Publication ITRS Test ITWG July 24 th, 2002.
IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002...
Transcript of IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002...
![Page 1: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/1.jpg)
IS TUCSON SINKING?
Arizona Department of WaterResources
National Monitoring DayOctober 18, 2002
![Page 2: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/2.jpg)
IS TUCSON SINKING?
![Page 3: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/3.jpg)
IS TUCSON SINKING?
![Page 4: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/4.jpg)
IS TUCSON SINKING?
![Page 5: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/5.jpg)
IS TUCSON SINKING?
![Page 6: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/6.jpg)
IS TUCSON SINKING?
![Page 7: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/7.jpg)
IS TUCSON SINKING?
![Page 8: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/8.jpg)
IS TUCSON SINKING?
![Page 9: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/9.jpg)
LandLandSubsidence Subsidence
Measurement Measurement Using Using
SAR SAR InterferometryInterferometry
ADWR10/2002
![Page 10: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/10.jpg)
What Is SAR Interferometry?
Land Surface
SequentialSatellitePasses
![Page 11: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/11.jpg)
Radar Interferogram 6/1993 to 1/1996
-0.8 in./yr. Max
Air Forcebase
5th St. & Country Club
Downtown
University
Irvington & Park Ave.
![Page 12: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/12.jpg)
Radar Interferogram 11/1993 to 1/2000
-0.8 in./yr. Max
Air Forcebase
5th St. & Country Club
Downtown
University
Irvington & Park Ave.
![Page 13: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/13.jpg)
What Causes Subsidence?
SandsSands ClaysClays
![Page 14: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/14.jpg)
H2OH2O
What Causes Subsidence?
Sands Clays
![Page 15: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/15.jpg)
What Causes Subsidence?
Sands Clays
Over-Burden
Over-Burden
![Page 16: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/16.jpg)
Techniques for Measuring Land Subsidence
• Global Positioning System (GPS) Surveys– Point measurement– Accurate within 1 inch
• Extensometers (measuring sticks in wells)– Point measurement– Very accurate, but only measures part of
aquifer
• SAR Interferometry– Large-scale measurement
– New, requires “ground-truthing”
![Page 17: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/17.jpg)
• Subsidence on the order of INCHES rather than FEET– Eloy, over 15 feet of subsidence by 1980s– Luke Air Force Base, over 10 feet of
subsidence by 1990s
• Subsidence in Tucson is REAL!– Potential damage to infrastructure
– No confirmed effects yet in Tucson
What Does It Mean?
Photo: H.H. Schumann
ELOY, AZ
![Page 18: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/18.jpg)
What Can We Do?
• Use Renewable Supplies
• Conserve Water!
• Continue to Monitor
Arizona Department of WaterResources• http://www.water.az.gov
![Page 19: IS TUCSON SINKING?web.sahra.arizona.edu/kt/media/files/Tucson_10-24-2002/Matt_Weber.pdfOct 24, 2002 · Land Subsidence • Global Positioning System (GPS) Surveys – Point measurement](https://reader034.fdocuments.us/reader034/viewer/2022050200/5f542f6f8d1ac429b1582f1c/html5/thumbnails/19.jpg)
SPECIAL THANKS TO:
• Center for Space Research, University of Texas– Dr. Sean Buckley
• ADWR Staff– Maurice Tatlow
• California Institute of Technology– Dr. Jakob van Zyl