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From 2013 to 2015, bathymetric surveys of New York City’s six West of Hudson reservoirs (Ashokan, Cannonsville, Neversink, Pepacton, Rondout, and Schoharie) were performed to provide updated capacity tables and bathymetric maps. Depths were surveyed with a single-beam echo sounder and real-time kinematic global positioning system (RTK-GPS) along planned transects at predetermined intervals for each reservoir. A separate set of echo sounder data was collected along transects at oblique angles to the main transects for accuracy assessment. Field survey data was combined with water-surface elevations in a geographic information system to create three-dimensional surfaces representing reservoir-bed elevations in the...
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From 2013 to 2015, bathymetric surveys of New York City’s six West of Hudson reservoirs (Ashokan, Cannonsville, Neversink, Pepacton, Rondout, and Schoharie) were performed to provide updated capacity tables and bathymetric maps. Depths were surveyed with a single-beam echo sounder and real-time kinematic global positioning system (RTK-GPS) along planned transects at predetermined intervals for each reservoir. A separate set of echo sounder data was collected along transects at oblique angles to the main transects for accuracy assessment. Field survey data was combined with water-surface elevations in a geographic information system to create three-dimensional surfaces representing reservoir-bed elevations in the...
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The U.S. Geological Survey collected field spectra collected from the Niobrara River in Nebraska August 15–18, 2016, to support research on remote sensing of river discharge. Reflectance measurements were made by wading the Niobrara River near Norden Notch using an Analytical Spectral Devices FieldSpec3 spectroradiometer operated in reflectance mode. The original *.asd files are provided in this data release.
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Region(s) of distribution of Slender Eelblenny (Lumpenus fabricii) Reinhardt, 1836 in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic seas...
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Fire can be a significant driver of permafrost change in boreal landscapes, altering the availability of soil carbon and nutrients that have important implications for future climate and ecological succession. However, not all landscapes are equally susceptible to fire-induced change. As fire frequency is expected to increase in the high latitudes, methods to understand the vulnerability and resilience of different landscapes to permafrost degradation are needed. Geophysical and other field observations reveal details of both near-surface (less than 1 m) and deeper (greater than 1 m) impacts of fire on permafrost along 14 transects that span burned-unburned boundaries in different landscape settings within interior...
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The present-day channels of the Chena River and Noyes Slough in downtown Fairbanks, Alaska, were formed as sloughs of the Tanana River, and part of the flow of the Tanana River occupied these waterways. Flow in these channels was reduced after the completion of Moose Creek Dike in 1945, and flow in the Chena River was affected by regulation from the Chena River Lakes Flood Control Project, which was completed in 1980. In 1981, flow in the Chena River was regulated for the first time by Moose Creek Dam, located about 20 miles upstream from Fairbanks. Constructed as part of the Chena River Lakes Flood Control Project, the dam was designed to reduce maximum flows to 12,000 cubic feet per second in downtown Fairbanks....
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More than 31 million hectares of land are protected and managed in 16 refuges by the U.S. Fish and Wildlife Service (USFWS) in Alaska. The vastness and isolation of Alaskan refuges give rise to relatively intact and complete ecosystems. The potential for these lands to provide habitat for trust species is likely to be altered, however, due to global climate change, which is having dramatic effects at high latitudes. The ability of USFWS to effectively manage these lands in the future will be enhanced by a regional inventory and monitoring program that integrates and supplements monitoring currently being implemented by individual refuges. Conceptual models inform monitoring programs in a number of ways, including...
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The growth in the use of Geographic Information Systems (GIS) has highlighted the need for digital geologic maps that have been attributed with information about age and lithology. Such maps can be conveniently used to generate derivative maps for manifold special purposes such as mineral-resource assessment, metallogenic studies, tectonic studies, and environmental research. This report is part of a series of integrated geologic map databases that cover the entire United States. Three national-scale geologic maps that portray most or all of the United States already exist; for the conterminous U.S., King and Beikman (1974a,b) compiled a map at a scale of 1:2,500,000, Beikman (1980) compiled a map for Alaska at...
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Region(s) of distribution of Ninespine Stickleback (Pungitius pungitius) (Linnaeus, 1758) in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic...
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Region(s) of distribution of Stout Eelblenny (Anisarchus medius) (Reinhardt, 1837) in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic seas...
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Region(s) of distribution of Archer Eelpout (Lycodes sagittarius) McAllister, 1976 in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic seas...
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Region(s) of distribution of Sea Tadpole (Careproctus reinhardti) (Krøyer, 1862) in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic seas where...
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Region(s) of distribution of Longear Eelpout (Lycodes seminudus) Reinhardt, 1837 in the Arctic as digitized for U.S. Geological Survey Scientific Investigations Report 2016-5038. For details on the project and purpose, see the report at https://doi.org/10.3133/sir20165038. Complete metadata for the collection of species datasets is in the metadata document "Dataset_for_Alaska_Marine_Fish_Ecology_Catalog.xml" at https://doi.org/10.5066/F7M61HD7. Source(s) for this digitized data layer are listed in the metadata Process Steps section. Note that the original source may show an extended area; some datasets were limited to the published map boundary. Distributions of marine fishes are shown in adjacent Arctic seas where...
map background search result map search result map Preliminary integrated geologic map databases for the United States: Digital data for the reconnaissance geologic map of the lower Yukon River region, Alaska Conceptual ecological models to support detection of ecological change on Alaska National Wildlife Refuges Biogeochemistry of arsenic and cadmium, Fortymile River watershed, East-Central Alaska NHD Point Events (Snapshot 8/25/2016) Echosounder Points, Cannonsville Reservoir, 2015 Preliminary Hydraulic Analysis and Implications for Restoration of Noyes Slough, Fairbanks, Alaska Echosounder Quality Assurance Points, Cannonsville Reservoir, 2015 Electrical Resistivity Tomography Observations; Alaska, 2015 final Marine Arctic point distribution of Sea Tadpole (Careproctus reinhardti) (Krøyer, 1862) Marine Arctic polygon distribution of Slender Eelblenny (Lumpenus fabricii) Reinhardt, 1836 Marine Arctic point distribution of Archer Eelpout (Lycodes sagittarius) McAllister, 1976 Marine Arctic polygon distribution of Longear Eelpout (Lycodes seminudus) Reinhardt, 1837 Marine Arctic polygon distribution of Ninespine Stickleback (Pungitius pungitius) (Linnaeus, 1758) Cottonwood Lake Study Area-Wetland Vegetation Zones-1982 Cottonwood Lake Study Area-Wetland Vegetation Zones-1992 Cottonwood Lake Study Area-Wetland Vegetation Zones-1998 Cottonwood Lake Study Area-Wetland Vegetation Zones-1999 Cottonwood Lake Study Area-Wetland Vegetation Zones-2003 Field spectra from the Niobrara River, Nebraska, August 15-18, 2016 Cottonwood Lake Study Area-Wetland Vegetation Zones-1982 Cottonwood Lake Study Area-Wetland Vegetation Zones-1992 Cottonwood Lake Study Area-Wetland Vegetation Zones-1999 Cottonwood Lake Study Area-Wetland Vegetation Zones-1998 Cottonwood Lake Study Area-Wetland Vegetation Zones-2003 Echosounder Quality Assurance Points, Cannonsville Reservoir, 2015 Echosounder Points, Cannonsville Reservoir, 2015 Preliminary Hydraulic Analysis and Implications for Restoration of Noyes Slough, Fairbanks, Alaska Biogeochemistry of arsenic and cadmium, Fortymile River watershed, East-Central Alaska Marine Arctic point distribution of Archer Eelpout (Lycodes sagittarius) McAllister, 1976 Electrical Resistivity Tomography Observations; Alaska, 2015 final Marine Arctic point distribution of Sea Tadpole (Careproctus reinhardti) (Krøyer, 1862) Preliminary integrated geologic map databases for the United States: Digital data for the reconnaissance geologic map of the lower Yukon River region, Alaska Conceptual ecological models to support detection of ecological change on Alaska National Wildlife Refuges Marine Arctic polygon distribution of Longear Eelpout (Lycodes seminudus) Reinhardt, 1837 Marine Arctic polygon distribution of Ninespine Stickleback (Pungitius pungitius) (Linnaeus, 1758) Marine Arctic polygon distribution of Slender Eelblenny (Lumpenus fabricii) Reinhardt, 1836 NHD Point Events (Snapshot 8/25/2016)