MODFLOW-NWT and MODPATH6 Used to Delineate Areas Contributing Groundwater and Travel Times to Receiving Waters in Kings, Queens, Nassau, and Suffolk Counties, New York
Dates
Release Date
2021-01-01
Start Date
2005-01-01
End Date
2015-12-31
Publication Date
2023-09-15
Citation
Misut, P.E., 2021, MODFLOW-NWT and MODPATH6 Used to Delineate Areas Contributing Groundwater and Travel Times to Receiving Waters in Kings, Queens, Nassau, and Suffolk Counties, New York: U.S. Geological Survey data release, https://doi.org/10.5066/P9DKILJY.
Summary
A previously developed three-dimensional steady-state groundwater flow model (https://doi.org/10.3133/sir20205091) is used to assist resource managers and planners in developing informed strategies to address nitrogen loading to coastal water bodies of Long Island, New York. Coastal water bodies of Long Island are important economic and recreational resources for the region. Therefore, the U.S. Geological Survey and New York State Department of Environmental Conservation initiated a program to delineate a comprehensive dataset of CAs (or areas contributing groundwater), travel times, and groundwater discharges to streams, lakes, marine-surface waters, and subsea discharge boundaries. The 25-layer regional groundwater-flow model of [...]
Summary
A previously developed three-dimensional steady-state groundwater flow model (https://doi.org/10.3133/sir20205091) is used to assist resource managers and planners in developing informed strategies to address nitrogen loading to coastal water bodies of Long Island, New York. Coastal water bodies of Long Island are important economic and recreational resources for the region. Therefore, the U.S. Geological Survey and New York State Department of Environmental Conservation initiated a program to delineate a comprehensive dataset of CAs (or areas contributing groundwater), travel times, and groundwater discharges to streams, lakes, marine-surface waters, and subsea discharge boundaries. The 25-layer regional groundwater-flow model of average regional hydrologic conditions used MODFLOW-NWT and MODPATH6 (for the particle-tracking analysis) to delineate CAs to 843 water bodies. Two steady-state conditions were simulated: pre-pumping conditions and recent conditions from 2005 to 2015. One hundred particles evenly distributed across the top of each 500- by 500-foot model cell that receives recharge at the water table, were tracked forward to discharge zones. This USGS data release contains all of the input and output files for the simulations described in the associated model documentation report (https://doi.org/10.3133/sir20215047).
The previously developed groundwater flow model (https://doi.org/10.3133/sir20205091) was used for particle-tracking analysis to delineate CAs and travel times, differentiate outflow to saline-water bodies from that to freshwater bodies, and calculate groundwater outflows to each individual surface-water body. This information is essential for developing informed strategies to address nitrogen loading to these systems, to provide the basis for further scientific study, and to engage the public. The development of the model input and output files included in this data release are documented in the U.S. Geological Survey Scientific Investigations Report 2021-5047 (https://doi.org/10.3133/sir20215047).
Preview Image
Image of the model domain and active and inactive areas of the model.