Enhanced data analysis for the VZMS: Conceptual model design and initial application for the Vadose Zone Monitoring System (VZMS), McClellan AFB. 1998 semi-annual report

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The VZMS project at McClellan AFB involves both vadose zone data collection as well as enhanced data analysis. The purpose of enhanced data analysis is to develop conceptual models to carry out model validation and evaluation, as well as sensitivity and predictive modeling studies. Enhanced data analysis consists primarily of T2VOC forward simulations and ITOUGH2 inverse modeling. The methodology the authors employ in the VZMS project involves developing a conceptual model and iteratively updating it based on the agreement between model results and VZMS data. They demonstrate the development of an initial T2VOC conceptual model for the S-7 site based ... continued below

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38 p.

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James, A. L. & Oldenburg, C. M. June 14, 1998.

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Description

The VZMS project at McClellan AFB involves both vadose zone data collection as well as enhanced data analysis. The purpose of enhanced data analysis is to develop conceptual models to carry out model validation and evaluation, as well as sensitivity and predictive modeling studies. Enhanced data analysis consists primarily of T2VOC forward simulations and ITOUGH2 inverse modeling. The methodology the authors employ in the VZMS project involves developing a conceptual model and iteratively updating it based on the agreement between model results and VZMS data. They demonstrate the development of an initial T2VOC conceptual model for the S-7 site based on data from instrument cluster VZMS-B. Lithologic data from the drilling logs along with empirical relations for estimating permeability and sediment moisture retention characteristics are used to define the layering of four different sediment types. The authors adjusted the layering of the sediments manually until the sediment moisture content profile from the T2VOC simulation of the gravity-capillary equilibrium agreed well with observed neutron probe data. Using this updated conceptual model, they performed inverse modeling using ITOUGH2 to find bet-fit absolute permeability values based on the minimization of differences between simulated and actual soil-gas pressure measurements.

Physical Description

38 p.

Notes

OSTI as DE98058255

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  • Other Information: PBD: 14 Jun 1998

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  • Other: DE98058255
  • Report No.: LBNL--41909
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/290989 | External Link
  • Office of Scientific & Technical Information Report Number: 290989
  • Archival Resource Key: ark:/67531/metadc674440

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  • June 14, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 4, 2015, 5:56 p.m.

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James, A. L. & Oldenburg, C. M. Enhanced data analysis for the VZMS: Conceptual model design and initial application for the Vadose Zone Monitoring System (VZMS), McClellan AFB. 1998 semi-annual report, report, June 14, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc674440/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.