Characterizing hydrogeologic heterogeneity using lithologic data

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Description

Large-scale (> 1 m) variability in hydraulic conductivity is usually the main influence on field-scale groundwater flow patterns and dispersive transport. Sediment lithologic descriptions and geophysical logs typically offer finer spatial resolution, and therefore more potential information about site-scale heterogeneity, than other site characterization data. In this study, a technique for generating a heterogeneous, three-dimensional hydraulic conductivity field from sediment lithologic descriptions is presented. The approach involves creating a three-dimensional, fine-scale representation of mud (silt + clay) percentage using a stratified interpolation algorithm. Mud percentage is then translated into horizontal and vertical conductivity using direct correlations derived from measured data ... continued below

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29 p.

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Flach, G.P.; Hamm, L.L.; Harris, M.K.; Thayer, P.A.; Haselow, J.S. & Smits, A.D. December 31, 1995.

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Description

Large-scale (> 1 m) variability in hydraulic conductivity is usually the main influence on field-scale groundwater flow patterns and dispersive transport. Sediment lithologic descriptions and geophysical logs typically offer finer spatial resolution, and therefore more potential information about site-scale heterogeneity, than other site characterization data. In this study, a technique for generating a heterogeneous, three-dimensional hydraulic conductivity field from sediment lithologic descriptions is presented. The approach involves creating a three-dimensional, fine-scale representation of mud (silt + clay) percentage using a stratified interpolation algorithm. Mud percentage is then translated into horizontal and vertical conductivity using direct correlations derived from measured data and inverse groundwater flow modeling. Lastly, the fine-scale conductivity fields are averaged to create a coarser grid for use in groundwater flow and transport modeling. The approach is demonstrated using a finite-element groundwater flow model of a Savannah River Site solid radioactive and hazardous waste burial ground. Hydrostratigraphic units in the area consist of fluvial, deltaic, and shallow marine sand, mud and calcareous sediment that exhibit abrupt facies changes over short distances.

Physical Description

29 p.

Notes

INIS; OSTI as DE97008845

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  • Other Information: PBD: [1995]

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  • Other: DE97008845
  • Report No.: WSRC-MS--95-0497
  • Grant Number: AC09-89SR18035
  • DOI: 10.2172/555397 | External Link
  • Office of Scientific & Technical Information Report Number: 555397
  • Archival Resource Key: ark:/67531/metadc697001

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  • December 31, 1995

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 9, 2016, 7:59 p.m.

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Flach, G.P.; Hamm, L.L.; Harris, M.K.; Thayer, P.A.; Haselow, J.S. & Smits, A.D. Characterizing hydrogeologic heterogeneity using lithologic data, report, December 31, 1995; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc697001/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.