Investigation of the impact of sparse data on the use of geostatistical approaches

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Techniques to estimate semivariogram parameters are investigated with respect to assessing the effects of sparse data and detecting the presence of a trend. These techniques are applied to the determination of semivariogram parameters used in the estimation of hydraulic head values at node locations from measured head data. The presence of no-flow boundaries is included in the estimation of hydraulic heads at node values by applying constraints to the head gradient across the no-flow boundaries. The resulting hydraulic head estimates are used in an inverse groundwater flow model to assess the impact of the no-flow boundary constraints on transmissivities determined ... continued below

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131 p.

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Lamorey, G.W. & Jacobson, E.A. October 1, 1995.

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Description

Techniques to estimate semivariogram parameters are investigated with respect to assessing the effects of sparse data and detecting the presence of a trend. These techniques are applied to the determination of semivariogram parameters used in the estimation of hydraulic head values at node locations from measured head data. The presence of no-flow boundaries is included in the estimation of hydraulic heads at node values by applying constraints to the head gradient across the no-flow boundaries. The resulting hydraulic head estimates are used in an inverse groundwater flow model to assess the impact of the no-flow boundary constraints on transmissivities determined from the inverse model. It is found in a case study that when gradients in the prior head distribution do not match assumed no-flow boundaries, the inverse model can produce low transmissivity values along these no-flow boundaries. Prior heads estimated with constraints on the head gradient across no-flow boundaries did not produce the low transmissivity values along no-flow boundaries.

Physical Description

131 p.

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INIS; OSTI as DE97000587

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  • Other Information: PBD: Oct 1995

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  • Other: DE97000587
  • Report No.: DOE/NV/10461--T77
  • Report No.: NWPO-TR--023-95
  • Grant Number: FG08-85NV10461
  • DOI: 10.2172/399669 | External Link
  • Office of Scientific & Technical Information Report Number: 399669
  • Archival Resource Key: ark:/67531/metadc685663

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 1, 1995

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Dec. 1, 2015, 4:09 p.m.

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Lamorey, G.W. & Jacobson, E.A. Investigation of the impact of sparse data on the use of geostatistical approaches, report, October 1, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc685663/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.