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Data release includes the U.S. Geological Survey (USGS) estimate of spring nitrogen fluxes summed from nine tributaries to the Chesapeake Bay from 1985 to 2023. Data are presented as the sum from tributaries within the USGS River Input Monitoring (RIM) network identified by site numbers: 01491000, 01578310, 01594440, 01646580, 01668000, 01673000, 01674500, 02035000, 02041650. Periods of estimation include January through May and November through May. The estimates are made using up-to-date streamflow and all total nitrogen analyses available as of June 1 of the reporting year.
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This dataset consists of fossil diatom counts from sediment cores collected in coastal environments on Montague Island, Alaska, and analyzed at Virginia Tech University.
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This data release contains foreshore slopes for primarily open-ocean sandy beaches along the west coast of the United States (California, Oregon and Washington). The slopes were calculated while extracting shoreline position from lidar point cloud data collected between 2002 and 2011. The shoreline positions have been previously published, but the slopes have not. A reference baseline was defined and then evenly-spaced cross-shore beach transects were created. Then all data points within 1 meter of each transect were associated with each transect. Next, it was determined which points were one the foreshore, and then a linear regression was fit through the foreshore points. Beach slope was defined as the slope of...
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This data release contains 2 shapefiles which include 626 unique shorelines and 3 foredune toes spanning 2016 to 2023 along Minnesota Point, a 9-kilometer long bay-mouth bar at the western end of Lake Superior. Each shoreline represents the intersection line between land and water at a unique time associated with the capture of a satellite image, and these shorelines are used to examine trends in beach width and investigate beach nourishment performance in an accompanying publication (Roland et al., 2024). The shorelines were extracted from 3-meter resolution Planet Labs PlanetScope satellite imagery following the methods of Doherty et al., 2022. A site-specific machine learning model was developed to classify image...
    map background search result map search result map Nitrogen flux estimates in support of Chesapeake Bay Hypoxia and Anoxia forecasts, 1985-2023 Beach foreshore slope for the West Coast of the United States (ver. 1.1, September 2024) Diatom Data from Coastal Environments on Montague Island, Alaska Satellite-derived shorelines and foredune toes along Minnesota Point (Duluth, MN) from 2016 to 2023 Diatom Data from Coastal Environments on Montague Island, Alaska Satellite-derived shorelines and foredune toes along Minnesota Point (Duluth, MN) from 2016 to 2023 Nitrogen flux estimates in support of Chesapeake Bay Hypoxia and Anoxia forecasts, 1985-2023 Beach foreshore slope for the West Coast of the United States (ver. 1.1, September 2024)