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In 2022, the U.S. Geological Survey (USGS) in cooperation with the New Hampshire Department of Transportation (NHDOT) made 107 horizontal-to-vertical spectral ratio (HVSR) passive seismic geophysical measurements at four transportation infrastructure sites in New Hampshire to determine the benefits of HVSR as an enhancement to traditional geotechnical site characterizations performed by NHDOT. Typically, data are obtained from the subsurface during borings to characterize geotechnical properties but often borings are spaced hundreds of feet apart. Geotechnical site characterization guided by geophysical surveys (such as the HVSR method) between borings will help provide a more thorough characterization. By combining...
Categories: Data;
Tags: Canterbury, NH,
Geophysics,
Geophysics,
Groundwater,
Horizontal-to-Vertical Spectral Ratio (HVSR) Seismic, All tags...
Lee, NH,
New Hampshire,
New London, NH,
Passive Seismic,
Slope failure,
Troy, NH,
USGS Science Data Catalog (SDC),
environment,
geoscientificInformation,
transportation, Fewer tags
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This online database (https://www.streamcontinuity.org/cdb2/naacc_search_crossing.cfm) serves as a common repository for road-stream crossing assessment data assembled by the North Atlantic Aquatic Connectivity Collaborative (NAACC). Both a network of partners and a source of shared resources, the NAACC offers a collaborative framework for taking on the critical task of assessing and upgrading the hundreds of thousands of outdated road-stream crossings across the region that represent barriers to wildlife movement and pose flooding risks to communities. The NAACC offers training in standard protocols for conducting assessments, online tools for prioritizing upgrades based on ecological benefits, and this database...
Categories: Data,
Web Site;
Tags: LCC Network Science Catalog,
Web Site,
anadromous,
aquatic barriers,
aquatic connectivity, All tags...
aquatic ecosystems,
completed,
culverts,
dams,
diadromous fish,
fish,
flood risk,
repository,
rivers,
roads,
streams, Fewer tags
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This project brings together the major partners involved in road-stream crossings to assess river and stream continuity and set priorities for restoring connectivity, and reducing flood damage to road crossings, within the North Atlantic region.
Categories: Data,
Project;
Tags: Applications and Tools,
Applications and Tools,
Conservation Planning,
Conservation Planning,
Federal resource managers, All tags...
Federal resource managers,
LCC,
LCC,
LCC Network Science Catalog,
NALCC,
NALCC,
North Atlantic Landscape Conservation Cooperative,
North Atlantic Landscape Conservation Cooperative,
Project,
USFWS SA R5 Project,
completed,
environment,
environment,
environment,
project, Fewer tags
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In 2022, the U.S. Geological Survey (USGS) New England Water Science Center, in cooperation with the New Hampshire Department of Transportation (NHDOT), surveyed four transportation infrastructure sites with frequency-domain electromagnetic induction (EMI) instruments and one site with ground-penetrating radar (GPR) to aid traditional geotechnical site characterizations performed by NHDOT. Information about subsurface physical properties is typically obtained through the use of borings during geotechnical site characterizations. Geotechnical site investigations that also include geophysical surveys (such as the EMI and GPR methods) between borings help provide more thorough characterizations. Integrated analysis...
Categories: Data;
Tags: Canterbury, NH,
Geophysics,
Geophysics,
Ground penetrating radar (GPR),
Groundwater, All tags...
Lee, NH,
New Hampshire,
New London, NH,
Troy, NH,
USGS Science Data Catalog (SDC),
electromagnetic,
environment,
geoscientific information,
geotechnical,
location,
society,
transportation,
transportation, Fewer tags
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