Using Groundwater Age and Other Isotopic Signatures to Delineate Groundwater Flow and Stratification

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Isotopic tracers, such as stable isotopes of the water molecule and tritium, have been used in investigations of groundwater flow and transport and recharge water source for several decades. While these data can place hard constraints on groundwater flow rates, the degree of vertical flow between aquifers and across aquitards, and recharge source area(s), they are rarely used, even for validation, in conceptual or numerical models of groundwater flow. The Groundwater Ambient Monitoring and Assessment Program, sponsored by the California State Water Resources Control Board, and carried out in collaboration with the U.S. Geological Survey, has provided the means to ... continued below

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6 p. (0.4 MB)

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Moran, J E & Hudson, G B August 31, 2005.

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Description

Isotopic tracers, such as stable isotopes of the water molecule and tritium, have been used in investigations of groundwater flow and transport and recharge water source for several decades. While these data can place hard constraints on groundwater flow rates, the degree of vertical flow between aquifers and across aquitards, and recharge source area(s), they are rarely used, even for validation, in conceptual or numerical models of groundwater flow. The Groundwater Ambient Monitoring and Assessment Program, sponsored by the California State Water Resources Control Board, and carried out in collaboration with the U.S. Geological Survey, has provided the means to gather an unprecedented number of tritium-helium groundwater ages in the basins of California. As the examples below illustrate, a collection of groundwater ages in a basin allows delineation of recharge areas (youngest ages), bulk flow rates and flowpaths, as well as a means of assessing susceptibility to anthropogenic contaminants.

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6 p. (0.4 MB)

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PDF-file: 6 pages; size: 0.4 Mbytes

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  • Presented at: Geological Society of America, Salt Lake City, UT, United States, Oct 15 - Oct 19, 2005

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  • Report No.: UCRL-PROC-215146
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 883572
  • Archival Resource Key: ark:/67531/metadc892611

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  • August 31, 2005

Added to The UNT Digital Library

  • Sept. 23, 2016, 2:42 p.m.

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  • April 17, 2017, 12:21 p.m.

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Moran, J E & Hudson, G B. Using Groundwater Age and Other Isotopic Signatures to Delineate Groundwater Flow and Stratification, article, August 31, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc892611/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.