A height-above-river raster produced from 2008 lidar bare-earth elevations for the lower 10 kilometers of the Snow River flood plain is used as part of a geomorphic assessment to identify areas susceptible to inundation and erosion during outburst floods from Snow Lake. This dataset presents flood plain elevations above the approximate elevation of the main river channel low water surface.

The USGS mapped main channels and alluvial fan extents in the lower 10 kilometers of the Snow River flood plain near Seward, Alaska as part of an assessment of river channel stability under an outburst flood regime. Channels and fan extents were mapped from aerial photographs and satellite imagery dating from 1951 to 2019.

The USGS mapped main channels and alluvial fan extents in the lower 10 kilometers of the Snow River flood plain near Seward, Alaska as part of an assessment of river channel stability under an outburst flood regime. Channels and fan extents were mapped from aerial photographs and satellite imagery dating from 1951 to 2019.

This dataset includes the input (raw survey data, computational mesh, hydrologic boundary conditions) and output data for a 2-dimensional hydraulic and sediment transport model of the lower Snow River flood plain near Seward, Alaska. Four outburst flood scenarios were simulated, including 3 historical floods and one hypothetical larger flood. The methods of deriving these datasets and using them to calculate scour are described in the associated USGS Scientific Investigations Report "Recent history of glacial outburst floods, analysis of channel changes, and development of a 2-dimensional flow and sediment transport model of the Snow River near Seward, Alaska".

This dataset includes the input (raw survey data, computational mesh, hydrologic boundary conditions) and output data for a 2-dimensional hydraulic and sediment transport model of the lower Snow River flood plain near Seward, Alaska. Four outburst flood scenarios were simulated, including 3 historical floods and one hypothetical larger flood. The methods of deriving these datasets and using them to calculate scour are described in the associated USGS Scientific Investigations Report "Recent history of glacial outburst floods, analysis of channel changes, and development of a 2-dimensional flow and sediment transport model of the Snow River near Seward, Alaska".

This data release includes 3 child items with mapping, measurement, and modeling of glacial outburst floods on the Snow River near Seward, Alaska. Child Item 1: "Historical Channel Positions and Alluvial Fan Extents for the Lower 10 Kilometers of the Snow River Flood Plain Near Seward, Alaska" Child Item 2: "Height Above River Elevations for the Lower 10 Kilometers of the Snow River Flood Plain Near Seward, Alaska" Child Item 3: "Tabular Input/Output Data and Model Files for a Two-dimensional Hydraulic and Sediment Transport Model of the Lower 10 Kilometers of the Snow River Near Seward, Alaska"

This dataset includes locations, pressure readings, and baro-corrected water surface elevations from three submersible pressure transducers deployed in the channel and floodplain of Snow River during the 2019 glacial lake outburst flood.

This dataset includes locations, pressure readings, and baro-corrected water surface elevations from three submersible pressure transducers deployed in the channel and floodplain of Snow River during the 2019 glacial lake outburst flood.

Lidar-derived elevation data for the Twentymile River watershed, Southcentral Alaska, collected August-October 2022, Raw Data File 2023-3, uses aerial lidar to produce a classified point cloud, digital surface model (DSM), digital terrain model (DTM), and intensity model of the Twentymile River watershed, Southcentral Alaska, during snow-free ground conditions from August to October 2022. The survey provides snow-free surface elevations for trail planning and assessing avalanche hazards, among other objectives. Ground control data were collected on August 31, 2022, and aerial lidar data were collected on multiple days from August 29 to October 14, 2022, and subsequently processed in a suite of geospatial processing software. These products are released as a Raw Data File with an open end-user license. All files can be downloaded from the Alaska Division of Geological & Geophysical Surveys website (http://doi.org/10.14509/30959).

This dataset consists of survey data from bank profiles surveyed June 12 and June 24-26, 2013 at the edge of the active braid plain of Exit Creek, a stream draining Exit Glacier in Kenai Fjords National Park, Alaska. The survey was conducted using Global Positioning System Real-Time Kinetic (GPS-RTK) transceivers and tied to monuments previously established by the U.S. Forest Service. Short transects (profiles) at 24 locations on the left edge of the braid plain and 12 locations on the right edge of the braid plain were surveyed for the purpose of characterizing the magnitude of bank height and whether the bank sloped up or down from the active braid plain. The intent of the survey was to provide detailed ground conditions at braid plain margins to supplement remotely sensed elevation data.