Use of absolute gravity measurements to monitor groundwater in the Española Basin, New Mexico

Allen H. Cogbill, John F. Ferguson, Elizabeth H. Keating, Mingjie Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

We present results of 32-month project using absolute gravity measurements to monitor groundwater in an arid to semi-arid region in northern New Mexico. Over 100 permanent gravity stations have been established in the groundwater basin. A-10 absolute gravity meters, manufactured by Micro-g LaCoste, Inc., have been used to monitor long-term gravity changes in the groundwater basin. Over fifty A-10 sites have been established; other gravity sites have been established by reference to the primary A-10 sites using Scintrex CG-3M and CG-5 relative gravimeters. Geodetic-quality GPS surveys were used to directly measure any possible elevation changes at the gravity sites. At good sites, away from regions where we expect changes due to groundwater removal, reproducibility of the A-10 measurements is ±4 μGal. Gravity stations were observed approximately every six months over the course of the project. Systematic changes in both gravity and station elevation have been observed at a number of sites. On the basis of our observations, we can delineate three areas which appear to have systematic changes in storage. We conclude that the use of high-precision absolute gravity measurements, in conjunction with precise observations of station elevation, can provide useful information for evaluating groundwater storage changes over time.

Original languageEnglish
Title of host publication19th Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2006: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints
Pages755-766
Number of pages12
Volume1
Publication statusPublished - 2006
Event19th Symposium on the Application of Geophysics to Engineering and Environmental Problems: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints, SAGEEP 2006 - Seattle, WA, United States
Duration: Apr 2 2006Apr 6 2006

Other

Other19th Symposium on the Application of Geophysics to Engineering and Environmental Problems: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints, SAGEEP 2006
CountryUnited States
CitySeattle, WA
Period4/2/064/6/06

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ASJC Scopus subject areas

  • Geophysics
  • Environmental Engineering

Cite this

Cogbill, A. H., Ferguson, J. F., Keating, E. H., & Chen, M. (2006). Use of absolute gravity measurements to monitor groundwater in the Española Basin, New Mexico. In 19th Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2006: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints (Vol. 1, pp. 755-766)