Data

This data release consists of flood hazard maps from compound coastal hazards--specifically sea-level rise (SLR) and projected coastal storms. Products include projected flood depths, flood extents including uncertainties, water elevations, wave heights, velocity hazards, and erosion and sedimentation patterns. These are generated using a suite of numerical models driven by outputs from...

Shoreline position data from the CoastSat methodology were used to describe beach changes along the California coast during 1984-2024. This data release includes the results of the time-series analyses, including mean annual deseasonalized shoreline positions for 329 beach segments and total uncertainty in these measurements. These techniques were applied to 329 beach segments, which...

This data release contains 57 high-resolution chirp sub-bottom profiles collected in the southern Great Salt Lake, Utah, by the U.S. Geological Survey in June 2021 during field activity 2021-615-FA. The dataset was acquired to image subsurface sedimentary structures and stratigraphy in support of efforts to characterize past earthquake events along the Great Salt Lake Fault, contributing...

This data release presents structure-from-motion (SfM) products derived from aerial imagery collected along the California coast as part of an ongoing effort by the USGS Coastal and Marine Hazards and Resources Program (CMHRP) Remote Sensing Coastal Change (RSCC) project. The products presented herein are point cloud and change detection products for 33 flights between January 2017 to...

This data release includes grain-size measurements on sediment samples collected from the substrate surface and uppermost 10 cm of sediment deposits in the Klamath River estuary, northern California. Samples were collected using a BMH-60 bed-material sampler deployed from a boat, or by hand trowel from subaerial or shallow-water (less than 0.5 m water depth) regions along the estuary...

The U.S. Geological Survey Pacific Coastal and Marine Science Center collected oceanographic and hydrographic monitoring data for a pilot project to place dredged sediment in bay shallows to nourish marshes conducted by the US Army Corps of Engineers, San Francisco District. Dredged material was placed in the shallows of South San Francisco Bay during December 2023. Monitoring spanned...

This data release provides tidally corrected shoreline positions for five groin field sites of around the United States (Ventura, CA, Newport Beach, CA , Santa Monica, CA, Long Branch, NJ, Sandwich, MA). Both CSV files of tidally corrected shorelines and GeoJSON files of the region of interests (ROIs), transects, and reference shorelines are provided within respective zip files. Both...

Along-shore surface-based 2D electrical resistivity tomography (ERT) surveys were collected in the nearshore region of Ofu, American Samoa.

In-situ nearshore seawater measurements of dissolved radon and water level were used to determine the advection rate of groundwater onto the fringing reef off Ofu, American Samoa.

The sediment core data presented here were compiled for use in a project studying the amount of sand either released from or stored within the bed sediments of San Francisco Bay, California from the 1980s to 2010s. Estimates of the change in sand storage in the bed sediments could be used in larger San Francisco Bay sand budget and transports studies as well as to inform management...

Geochemical analysis of coastal springs and possible source waters were conducted in the National Park Service's National Park of American Samoa (NPS-NPSA) Ofu Island unit. Water samples were analyzed for dissolved nutrients, nitrate isotopes (delta-18-O and delta-15-N). Algae samples were collected and analyzed for delta-15-N and delta-13-C values.

Charcoal counts and soil, water, and reservoir sediment-core geochemistry were characterized eight months after the November 2021 Muckamuck Fire in the North Fork Salmon Creek basin and Conconully Reservoir, Washington, the receiving water body. Parameters include sand-sized charcoal, Cesium-137, excess Lead-210, aqueous and solid-phase elemental chemistry, and polycyclic aromatic...