Simulation of groundwater flow pathlines and freshwater/saltwater transition zone movement, Manhasset Neck, Nassau County, New York

Abstract

N.Y., for maintaining and providing production-well pumpage data.

Simulation of zones of groundwater contribution to wells south of the Naval Weapons Industrial Reserve Plant in Bethpage, New York

“…The top of the plume is located within the finely discretized focus zone of the Magothy aquifer. The bottom no-flow boundary of the model is chosen to be the base of unconsolidated deposits (base of the Lloyd aquifer of the Raritan Formation) in order to fully represent the groundwater flow system, as has been done by other Nassau County groundwater flow models such as (Misut and Aphale, 2014).…”

Simulation of zones of contribution to wells at site GM–38, Naval Weapons Industrial Reserve Plant, Bethpage, New York

“…The top of the GM-38 Hot Spot is located within the finely discretized inner region of the Magothy aquifer. The bottom no-flow boundary of the model is chosen to be the base of unconsolidated deposits in the area (base of the Lloyd aquifer), in order to fully represent the groundwater flow system as has been done by other Nassau County groundwater flow models such as (Misut and Aphale, 2014). A steady state model was used to simulate average present hydrologic conditions.…”

“…Porosity parameters directly correlate to MODPATH particle travel time, and there is significant uncertainty in choosing a value. The baseline porosity parameter value is 0.25, is used in the ARCADIS model (2010), and is in the middle of a range between 0.15 and 0.35 (Misut and Aphale, 2014). An alternate model with porosity of 0.15 would result in shorter particle travel times (table 11).…”