Modeling 'bank storage' from the influx along a tidal channel at the Naval Fuel Supply Center at Craney Island, Virginia.

摘要

"Bank Storage" from the tidal influx along Craney Creek was verified against field data using a site-wide Finite Element Mesh Water (FEMWATER) Model, an inset mesh FEMWATER model, and an analytical solution. The site-wide FEMWATER "living model" will be used to manage the future cleanup and shut-down of this facility in the 200 tanks FISC Craney Island at Portsmouth, Virginia. The expansion of the test model to a site-wide model produced a better calibration model than previously modeled by McGehee and Praveen (2000). Hydrology of the groundwater flow field required a Dirichlet constant head boundary condition along the landward boundary and a transient boundary condition along the creek boundary. An inset mesh with an oscillating transient boundary modeling the hourly tidal changes was simulated for one month to verify the site-wide total head solution. A heat transfer analytical solution was applied to the groundwater problem to check the tidal "bank storage" calculated in the site-wide total head solution. A low pressure zone created by natural overland flow opposing the tidal influx produces a natural barrier to contaminant flow. Two scenario tests were simulated to answer questions concerning the viability of the "bank storage" during seasonal extremes and whether trees could be added to lower the groundwater table to support the remediation activities. The extremes imposed could not over ride the "bank storage" effect. The addition of trees will not have an effect on the remediation efforts.