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
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.
- Research Organization:
- Lawrence Berkeley National Lab., Earth Sciences Div., Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States); Department of Defense, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 290989
- Report Number(s):
- LBNL-41909; ON: DE98058255; CNN: Military Interdepartmental Purchase Request FD2040-96-74020EM; TRN: AHC29901%%194
- Resource Relation:
- Other Information: PBD: 14 Jun 1998
- Country of Publication:
- United States
- Language:
- English
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