Prepared in cooperation with the New Jersey Department of Environmental Protection
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The model, which simulates flow in the New Jersey Coastal Plain sediments, developed for the U.S. Geological Survey Regional Aquifer System Analysis (RASA) program was revised. The RASA model was revised with (1) a rediscretization of the model parameters with a finer cell size, (2) a spatially variable recharge rate that is based on rates determined by recent studies and, (3) ground-water withdrawal data from 1981 to 1998.
The RASA model framework, which subdivided the Coastal Plain sediments into 10 aquifers and 9 confining units, was preserved in the revised model. A transient model that simulates flow conditions from January 1, 1968 to December 31, 1998, was constructed using 21 stress periods.
The model was calibrated by attempting to match the simulated results with (1) estimated base flow for five river basins, (2) measured water levels in long-term hydrographs for 28 selected observation wells, and (3) potentiometric surfaces in the model area for 1978, 1983, 1998, 1993, and 1998 conditions. The estimated and simulated base flow in the five river basins compare well. In general, the simulated water levels matched the interpreted potentiometric surfaces and the measured water levels of the hydrographs within 25 feet.
Abstract
Introduction
Purpose and scope
Location and extent of study area
Previous investigations
Conceptual hydrogeologic model
Hydrogeologic framework
Ground-water-flow system
Original and revised model designs
Model approach
Grid design
Ground-water withdrawals
Lateral and lower boundary conditions
Upper boundary conditions
Streams
Recharge
Model calibration
Revisions to model input data
Recharge
Vertical leakance
Storage coefficient
Boundary fluxes
Simulated potentiometric surfaces
1978 ground-water-flow conditions
1998 ground-water-flow conditions
Simulated and measured water-level hydrographs
Base flow
Model limitations
Summary
References cited
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