The USGS Nansemond research station, located adjacent to the Hampton Roads Sanitation District's SWIFT pilot site. The building contains the Nansemond extensometer.
Analog dial gage (left) and a digital linear potentiometer (right)
Detailed Description
An analog dial gage (left) and a digital linear potentiometer (right with blue barrel) used to measure land-surface movement in response to aquifer system deformation at the USGS Nansemond extensometer. The potentiometer is the primary instrument for the extensometer with a resolution of about 0.00001 feet (0.003048 millimeters) and a travel range of 0.328084 feet (100 millimeters). The dial gage can be read to a precision of 0.0001 inches and has a range of 1 inch.
Sources/Usage
Public Domain.
Related Content
Check out more images of our Nansemond research site below:
USGS Extensometer Drilling in Virginia
Along the Atlantic Coast, a 2000+ ft deep hole has been drilled by the USGS to assess the issues of groundwater pumping, relative sea-level rise, and land subsidence. This video shows the drilling of the first extensometer to measure land subsidence in the North Atlantic Coastal Plain in 30+ years.
The USGS Nansemond research station.
The USGS Nansemond research station, located adjacent to the Hampton Roads Sanitation District's SWIFT pilot site. The building contains the Nansemond extensometer.
USGS Nansemond drilling site.
This photograph shows the drilling site for the USGS Nansemond extensometer. The site is located adjacent to the Hampton Roads Sanitation District's SWIFT pilot site. The drilling would extend 1,960 feet below the ground surface.
This photograph shows the drilling site for the USGS Nansemond extensometer. The site is located adjacent to the Hampton Roads Sanitation District's SWIFT pilot site. The drilling would extend 1,960 feet below the ground surface.
Virginia Extensometer Drilling Site
This photograph shows the initial drilling for the borehole extensometer installed at the Nansemond, Virginia research site.
This photograph shows the initial drilling for the borehole extensometer installed at the Nansemond, Virginia research site.
The USGS Nansemond pipe extensometer.
The USGS Nansemond pipe extensometer (59D 39) showing the triangular table in green and the instrument bridge in yellow above the extensometer. The piers that support the table extend down 65 feet. The movement of the table relative to the extensometer is how land-surface movement is measured.
The USGS Nansemond pipe extensometer (59D 39) showing the triangular table in green and the instrument bridge in yellow above the extensometer. The piers that support the table extend down 65 feet. The movement of the table relative to the extensometer is how land-surface movement is measured.
The USGS Nansemond pipe extensometer.
The USGS Nansemond pipe extensometer (59D 39) with a total depth of 1,960 feet.
The USGS Nansemond pipe extensometer (59D 39) with a total depth of 1,960 feet.
The USGS Nansemond research station
The USGS Nansemond research station.
The USGS Nansemond research station.
USGS Nansemond extensometer Pivot Block.
Pivot block where the USGS Nansemond extensometer connects to the fulcrum arm.
Pivot block where the USGS Nansemond extensometer connects to the fulcrum arm.
Installing the linear potentiometer on the USGS Nansemond extensometer
Installing the linear potentiometer on the USGS Nansemond extensometer. The linear potentiometer is used to measure land-surface movement in response to aquifer system deformation at the USGS Nansemond extensometer.
Installing the linear potentiometer on the USGS Nansemond extensometer. The linear potentiometer is used to measure land-surface movement in response to aquifer system deformation at the USGS Nansemond extensometer.
Related Content
Check out more images of our Nansemond research site below:
USGS Extensometer Drilling in Virginia
Along the Atlantic Coast, a 2000+ ft deep hole has been drilled by the USGS to assess the issues of groundwater pumping, relative sea-level rise, and land subsidence. This video shows the drilling of the first extensometer to measure land subsidence in the North Atlantic Coastal Plain in 30+ years.
The USGS Nansemond research station.
The USGS Nansemond research station, located adjacent to the Hampton Roads Sanitation District's SWIFT pilot site. The building contains the Nansemond extensometer.
The USGS Nansemond research station, located adjacent to the Hampton Roads Sanitation District's SWIFT pilot site. The building contains the Nansemond extensometer.
USGS Nansemond drilling site.
This photograph shows the drilling site for the USGS Nansemond extensometer. The site is located adjacent to the Hampton Roads Sanitation District's SWIFT pilot site. The drilling would extend 1,960 feet below the ground surface.
This photograph shows the drilling site for the USGS Nansemond extensometer. The site is located adjacent to the Hampton Roads Sanitation District's SWIFT pilot site. The drilling would extend 1,960 feet below the ground surface.
Virginia Extensometer Drilling Site
This photograph shows the initial drilling for the borehole extensometer installed at the Nansemond, Virginia research site.
This photograph shows the initial drilling for the borehole extensometer installed at the Nansemond, Virginia research site.
The USGS Nansemond pipe extensometer.
The USGS Nansemond pipe extensometer (59D 39) showing the triangular table in green and the instrument bridge in yellow above the extensometer. The piers that support the table extend down 65 feet. The movement of the table relative to the extensometer is how land-surface movement is measured.
The USGS Nansemond pipe extensometer (59D 39) showing the triangular table in green and the instrument bridge in yellow above the extensometer. The piers that support the table extend down 65 feet. The movement of the table relative to the extensometer is how land-surface movement is measured.
The USGS Nansemond pipe extensometer.
The USGS Nansemond pipe extensometer (59D 39) with a total depth of 1,960 feet.
The USGS Nansemond pipe extensometer (59D 39) with a total depth of 1,960 feet.
The USGS Nansemond research station
The USGS Nansemond research station.
The USGS Nansemond research station.
USGS Nansemond extensometer Pivot Block.
Pivot block where the USGS Nansemond extensometer connects to the fulcrum arm.
Pivot block where the USGS Nansemond extensometer connects to the fulcrum arm.
Installing the linear potentiometer on the USGS Nansemond extensometer
Installing the linear potentiometer on the USGS Nansemond extensometer. The linear potentiometer is used to measure land-surface movement in response to aquifer system deformation at the USGS Nansemond extensometer.
Installing the linear potentiometer on the USGS Nansemond extensometer. The linear potentiometer is used to measure land-surface movement in response to aquifer system deformation at the USGS Nansemond extensometer.