| snippet:
|
This map shows simulated relative salinity in groundwater. Relative salinity is defined here as 0 = freshwater and 1= saltwater and is dimensionless. The map shows relative salinity greater than or equal to 0.1. Surface water relative salinity bounded by MHHW extent (from NH Granit) is not shown. The purpose of this analysis is to estimate the inland extent of saline groundwater in the overburden (unconsolidated deposits) and deep bedrock. Simulations are presented on the NH Coastal Viewer for current conditions with no sea level rise (SLR) and for 8 ft of SLR, a worst-case scenario. The other SLR scenarios were simulated but are not presented on the NH Coastal Viewer. They are available by contacting the principal investigator or other points of contact for this project. Shallow saline groundwater is corrosive to underground infrastructure, and deep saline groundwater may affect the quality of drinking water from deep wells near the coast. This map shows SWI in bedrock approximately 800 feet below MSL with 8 feet of SLR. |
| summary:
|
This map shows simulated relative salinity in groundwater. Relative salinity is defined here as 0 = freshwater and 1= saltwater and is dimensionless. The map shows relative salinity greater than or equal to 0.1. Surface water relative salinity bounded by MHHW extent (from NH Granit) is not shown. The purpose of this analysis is to estimate the inland extent of saline groundwater in the overburden (unconsolidated deposits) and deep bedrock. Simulations are presented on the NH Coastal Viewer for current conditions with no sea level rise (SLR) and for 8 ft of SLR, a worst-case scenario. The other SLR scenarios were simulated but are not presented on the NH Coastal Viewer. They are available by contacting the principal investigator or other points of contact for this project. Shallow saline groundwater is corrosive to underground infrastructure, and deep saline groundwater may affect the quality of drinking water from deep wells near the coast. This map shows SWI in bedrock approximately 800 feet below MSL with 8 feet of SLR. |
| accessInformation:
|
Jayne F. Knott, Ph.D. of JFK Environmental Services LLC and Jennifer M. Jacobs, Ph.D. of Jennifer M. Jacobs & Associates LLC. This work was funded by the NH Department of Environmental Services. |
| thumbnail:
|
|
| maxScale:
|
5000 |
| typeKeywords:
|
[] |
| description:
|
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Groundwater modeling was used to simulate the effects of sea-level rise on groundwater levels in the New Hampshire Seacoast. The MODFLOW-USG Transport model (Panday, 2022) was used to simulate groundwater flow and saltwater intrusion in these communities. This map shows relative salinity (0=freshwater-blue,1=saltwater-red). SWI was simulated for Rollinsford, Dover, Madbury, Durham, Newmarket, Newfields, Exeter, Newington, Portsmouth, New Castle, and parts of Rye and Stratham. SWI was not simulated in the southern portion of the NH Seacoast, including parts of Rye and Stratham, Greenland, North Hampton, Hampton, Hampton Falls, and Seabrook. The SWI modeling produced estimates of relative salinity in groundwater at various depths ranging from approximately 10 feet to more than 800 feet. This map shows SWI in bedrock approximately 800 feet below MSL with 8 feet of SLR. There is substantial uncertainty in these estimates due to limited knowledge of bedrock fracturing and other subsurface parameters. These model results and maps provide a first-cut estimate of saltwater intrusion and should be enhanced and/or verified by field measurements.</SPAN></P></DIV></DIV></DIV> |
| licenseInfo:
|
|
| catalogPath:
|
|
| title:
|
Simulated Saltwater Intrusion (SWI) in the Bedrock with 8 feet Sea Level Rise (SLR) |
| type:
|
|
| url:
|
|
| tags:
|
["environment","geoscientific information","inland waters","oceans","saltwater intrusion","sea level rise","NH Seacoast North","years 2020 through 2150","resiliency planning"] |
| culture:
|
en-US |
| portalUrl:
|
|
| name:
|
|
| guid:
|
|
| minScale:
|
150000000 |
| spatialReference:
|
|