Integrated Application of Spatial Statistics, GIS and Contaminant Transport Modeling for In situ Biodegradation Assessment

摘要

Groundwater flow and advective, dispersive, sorptive, and biodegradative transport were simulated in a three-dimensional heterogeneous aquifer at a Naval National Test site (NNTS) in California. An important issue in the application of mathematical models to describe or predict the fate of solutes in soil and groundwater systems is providing the necessary data to support the spatial, temporal, and hydrogeologic model parameter requirements. The larger, more complex the model and scope of application, the more likely that significant amounts of data of several types are required. The DOD state-of-the-are three-dimensional Groundwater Modeling System (GMS) was applied to the site to demonstrate its capabilities for data processing, analyzing ,visualizing and animating, and predicting BTEX (benzene, toluene, ethylbenzene, and xylenes) contaminant migration and biodegradation. The GMS has multiple (6 fielded; 3 beta; 3 alpha) flow and transport models and is, in and unto itself, a geospatial modeling system built around GiS (Geographic Information System) constructs. Thsi allows seamless connectivity with existing GIS capabilities on the part of GMS. Also, GMS contains spatial statistical measures and provides a single user environment with a consistent user interface to multiple models and over 40 analysis tools, visualization and animation. Integrated application of spatial statistics, GIS and contaminant transport modeling in the GMS has been proved a cost-effective approach for environmental assessment.