Nancy DeWitt
Nancy DeWitt is a Geologist at the St. Petersburg Coastal and Marine Science Center in St. Petersburg, Florida.
Science and Products
Filter Total Items: 35
Luminescence Data For: Vibracores Collected in 2021 from the Central Florida Gulf Coast Barrier Islands Luminescence Data For: Vibracores Collected in 2021 from the Central Florida Gulf Coast Barrier Islands
This report summarizes the dating results from sedimentary deposits sampled by the St. Petersburg Coastal and Marine Science Center and analyzed at the USGS Luminescence Geochronology Laboratory. Within this report, we detail the luminescence measurement, equivalent dose determination, and dating-related calculations. We recommend that this report be included as the supplementary...
Coastal Single-beam Bathymetry Data Collected in 2023 from the Chandeleur Islands, Louisiana Coastal Single-beam Bathymetry Data Collected in 2023 from the Chandeleur Islands, Louisiana
Scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) conducted single-beam and multibeam bathymetry (Stalk and others, 2025) surveys around the northern Chandeleur Islands, Louisiana, from June 12 to 20 and from July 31 to August 9, 2023, as part of Field Activity Number (FAN) 2023-325-FA. The purpose of data collection was to...
Sedimentologic Data From Vibracores Collected in 2023 From St. Andrew Bay, Florida Sedimentologic Data From Vibracores Collected in 2023 From St. Andrew Bay, Florida
In April 2023, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) collected 11 sediment vibracores within East Bay, St. Andrew Bay, Florida (FL). Sediment vibracore and lithology data in this data release provide assessments on the composition and age of sediments below the seafloor. This data release serves as an archive of...
Sediment Data from Vibracores Collected in 2021 From Central Florida Gulf Coast Barrier Islands Sediment Data from Vibracores Collected in 2021 From Central Florida Gulf Coast Barrier Islands
In 2021, scientists from the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center (USGS SPCMSC) conducted ground penetrating radar (GPR) and sediment sampling surveys on barrier islands located along the central Florida Gulf Coast (CFGC), Pinellas County, Florida. This study investigated the past evolution of the CFGC from field sites at Anclote Keys, Caladesi and...
Single-beam Bathymetry Data Collected in 2022 From Point Aux Chenes Bay, Mississippi Single-beam Bathymetry Data Collected in 2022 From Point Aux Chenes Bay, Mississippi
Scientists from the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center (USGS – SPCSMC), conducted a single-beam bathymetry survey within Point Aux Chenes Bay, Mississippi, in June 2022 under the USGS Field Activity Number (FAN) 2022-320-FA. The data was collected from two personal watercrafts (PWC): RV Shark (SubFAN 22CCT09, WVR1) and RV Chum (SubFAN 22CCT10, WVR2)...
Chirp Sub-Bottom Profile Geophysical Data Collected in 2021 and 2022 From Duck, North Carolina Chirp Sub-Bottom Profile Geophysical Data Collected in 2021 and 2022 From Duck, North Carolina
As part of the Coastal Sediment Availability and Flux and DUring Nearshore Event eXperiment (DUNEX) projects, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center and U.S. Army Corps of Engineers, Engineer Research and Development Center (USACE-ERDC) conducted repeat, nearshore geophysical surveys to map the shoreface and characterize...
Filter Total Items: 32
Nearshore single-beam bathymetry data collected in 2015, Dauphin Island, Alabama Nearshore single-beam bathymetry data collected in 2015, Dauphin Island, Alabama
Dauphin Island, Alabama, is a barrier island located in the northern Gulf of Mexico that supports local residences, tourism, commercial infrastructure, and historic Fort Gaines. During the past decade, Dauphin Island was affected by several major hurricanes—Hurricanes Ivan (2004), Katrina (2005), and Isaac (2012)—and storms, along with sea-level rise, continue to present a threat to...
Authors
Nancy T. DeWitt, Chelsea A. Stalk, James G. Flocks, Julie Bernier, Kyle W. Kelso, Jake J. Fredericks, Thomas M. Tuten
Nearshore coastal bathymetry data collected in 2016 from West Ship Island to Horn Island, Gulf Islands National Seashore, Mississippi Nearshore coastal bathymetry data collected in 2016 from West Ship Island to Horn Island, Gulf Islands National Seashore, Mississippi
The U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center, in cooperation with the U.S. Army Corps of Engineers, Mobile District, conducted bathymetric surveys of the nearshore waters surrounding Ship and Horn Islands, Gulf Islands National Seashore, Mississippi. The objective of this study was to establish base-level elevation conditions around West Ship, East...
Authors
Nancy T. DeWitt, Chelsea A. Stalk, Jake J. Fredericks, James G. Flocks, Kyle W. Kelso, Andrew S. Farmer, Thomas M. Tuten, Noreen A. Buster
Chirp subbottom profile data collected in 2015 from the northern Chandeleur Islands, Louisiana Chirp subbottom profile data collected in 2015 from the northern Chandeleur Islands, Louisiana
As part of the Barrier Island Evolution Research project, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted a nearshore geophysical survey around the northern Chandeleur Islands, Louisiana, in September 2015. The objective of the project is to improve the understanding of barrier island geomorphic evolution, particularly storm...
Authors
Arnell S. Forde, Nancy T. DeWitt, Jake J. Fredericks, Jennifer L. Miselis
Single-beam bathymetry data collected in 2015 from Grand Bay, Alabama-Mississippi Single-beam bathymetry data collected in 2015 from Grand Bay, Alabama-Mississippi
As part of the Sea-level and Storm Impacts on Estuarine Environments and Shorelines (SSIEES) project, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted a single-beam bathymetry survey within the estuarine, open-bay, and tidal creek environments of Grand Bay, Alabama-Mississippi, from May to June 2015. The goal of the SSIEES...
Authors
Nancy T. DeWitt, Chelsea A. Stalk, Christopher G. Smith, Stanley D. Locker, Jake J. Fredericks, Terrence A. McCloskey, Cathryn J. Wheaton
Analysis of seafloor change around Dauphin Island, Alabama, 1987–2015 Analysis of seafloor change around Dauphin Island, Alabama, 1987–2015
Dauphin Island is a 26-km-long barrier island located southwest of Mobile Bay, Alabama, in the north-central Gulf of Mexico. The island contains sandy beaches, dunes, maritime forests, freshwater ponds and intertidal wetlands, providing habitat for many endangered and threatened species. Dauphin Island also provides protection for and maintains estuarine conditions within Mississippi...
Authors
James G. Flocks, Nancy T. DeWitt, Chelsea A. Stalk
Archive of bathymetry data collected in South Florida from 1995 to 2015 Archive of bathymetry data collected in South Florida from 1995 to 2015
Description Land development and alterations of the ecosystem in south Florida over the past 100 years have decreased freshwater and increased nutrient flows into many of Florida's estuaries, bays, and coastal regions. As a result, there has been a decrease in the water quality in many of these critical habitats, often prompting seagrass die-offs and reduced fish and aquatic life...
Authors
Mark Erik Hansen, Nancy T. DeWitt, Billy J. Reynolds
Science and Products
Filter Total Items: 35
Luminescence Data For: Vibracores Collected in 2021 from the Central Florida Gulf Coast Barrier Islands Luminescence Data For: Vibracores Collected in 2021 from the Central Florida Gulf Coast Barrier Islands
This report summarizes the dating results from sedimentary deposits sampled by the St. Petersburg Coastal and Marine Science Center and analyzed at the USGS Luminescence Geochronology Laboratory. Within this report, we detail the luminescence measurement, equivalent dose determination, and dating-related calculations. We recommend that this report be included as the supplementary...
Coastal Single-beam Bathymetry Data Collected in 2023 from the Chandeleur Islands, Louisiana Coastal Single-beam Bathymetry Data Collected in 2023 from the Chandeleur Islands, Louisiana
Scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) conducted single-beam and multibeam bathymetry (Stalk and others, 2025) surveys around the northern Chandeleur Islands, Louisiana, from June 12 to 20 and from July 31 to August 9, 2023, as part of Field Activity Number (FAN) 2023-325-FA. The purpose of data collection was to...
Sedimentologic Data From Vibracores Collected in 2023 From St. Andrew Bay, Florida Sedimentologic Data From Vibracores Collected in 2023 From St. Andrew Bay, Florida
In April 2023, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) collected 11 sediment vibracores within East Bay, St. Andrew Bay, Florida (FL). Sediment vibracore and lithology data in this data release provide assessments on the composition and age of sediments below the seafloor. This data release serves as an archive of...
Sediment Data from Vibracores Collected in 2021 From Central Florida Gulf Coast Barrier Islands Sediment Data from Vibracores Collected in 2021 From Central Florida Gulf Coast Barrier Islands
In 2021, scientists from the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center (USGS SPCMSC) conducted ground penetrating radar (GPR) and sediment sampling surveys on barrier islands located along the central Florida Gulf Coast (CFGC), Pinellas County, Florida. This study investigated the past evolution of the CFGC from field sites at Anclote Keys, Caladesi and...
Single-beam Bathymetry Data Collected in 2022 From Point Aux Chenes Bay, Mississippi Single-beam Bathymetry Data Collected in 2022 From Point Aux Chenes Bay, Mississippi
Scientists from the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center (USGS – SPCSMC), conducted a single-beam bathymetry survey within Point Aux Chenes Bay, Mississippi, in June 2022 under the USGS Field Activity Number (FAN) 2022-320-FA. The data was collected from two personal watercrafts (PWC): RV Shark (SubFAN 22CCT09, WVR1) and RV Chum (SubFAN 22CCT10, WVR2)...
Chirp Sub-Bottom Profile Geophysical Data Collected in 2021 and 2022 From Duck, North Carolina Chirp Sub-Bottom Profile Geophysical Data Collected in 2021 and 2022 From Duck, North Carolina
As part of the Coastal Sediment Availability and Flux and DUring Nearshore Event eXperiment (DUNEX) projects, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center and U.S. Army Corps of Engineers, Engineer Research and Development Center (USACE-ERDC) conducted repeat, nearshore geophysical surveys to map the shoreface and characterize...
Filter Total Items: 32
Nearshore single-beam bathymetry data collected in 2015, Dauphin Island, Alabama Nearshore single-beam bathymetry data collected in 2015, Dauphin Island, Alabama
Dauphin Island, Alabama, is a barrier island located in the northern Gulf of Mexico that supports local residences, tourism, commercial infrastructure, and historic Fort Gaines. During the past decade, Dauphin Island was affected by several major hurricanes—Hurricanes Ivan (2004), Katrina (2005), and Isaac (2012)—and storms, along with sea-level rise, continue to present a threat to...
Authors
Nancy T. DeWitt, Chelsea A. Stalk, James G. Flocks, Julie Bernier, Kyle W. Kelso, Jake J. Fredericks, Thomas M. Tuten
Nearshore coastal bathymetry data collected in 2016 from West Ship Island to Horn Island, Gulf Islands National Seashore, Mississippi Nearshore coastal bathymetry data collected in 2016 from West Ship Island to Horn Island, Gulf Islands National Seashore, Mississippi
The U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center, in cooperation with the U.S. Army Corps of Engineers, Mobile District, conducted bathymetric surveys of the nearshore waters surrounding Ship and Horn Islands, Gulf Islands National Seashore, Mississippi. The objective of this study was to establish base-level elevation conditions around West Ship, East...
Authors
Nancy T. DeWitt, Chelsea A. Stalk, Jake J. Fredericks, James G. Flocks, Kyle W. Kelso, Andrew S. Farmer, Thomas M. Tuten, Noreen A. Buster
Chirp subbottom profile data collected in 2015 from the northern Chandeleur Islands, Louisiana Chirp subbottom profile data collected in 2015 from the northern Chandeleur Islands, Louisiana
As part of the Barrier Island Evolution Research project, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted a nearshore geophysical survey around the northern Chandeleur Islands, Louisiana, in September 2015. The objective of the project is to improve the understanding of barrier island geomorphic evolution, particularly storm...
Authors
Arnell S. Forde, Nancy T. DeWitt, Jake J. Fredericks, Jennifer L. Miselis
Single-beam bathymetry data collected in 2015 from Grand Bay, Alabama-Mississippi Single-beam bathymetry data collected in 2015 from Grand Bay, Alabama-Mississippi
As part of the Sea-level and Storm Impacts on Estuarine Environments and Shorelines (SSIEES) project, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted a single-beam bathymetry survey within the estuarine, open-bay, and tidal creek environments of Grand Bay, Alabama-Mississippi, from May to June 2015. The goal of the SSIEES...
Authors
Nancy T. DeWitt, Chelsea A. Stalk, Christopher G. Smith, Stanley D. Locker, Jake J. Fredericks, Terrence A. McCloskey, Cathryn J. Wheaton
Analysis of seafloor change around Dauphin Island, Alabama, 1987–2015 Analysis of seafloor change around Dauphin Island, Alabama, 1987–2015
Dauphin Island is a 26-km-long barrier island located southwest of Mobile Bay, Alabama, in the north-central Gulf of Mexico. The island contains sandy beaches, dunes, maritime forests, freshwater ponds and intertidal wetlands, providing habitat for many endangered and threatened species. Dauphin Island also provides protection for and maintains estuarine conditions within Mississippi...
Authors
James G. Flocks, Nancy T. DeWitt, Chelsea A. Stalk
Archive of bathymetry data collected in South Florida from 1995 to 2015 Archive of bathymetry data collected in South Florida from 1995 to 2015
Description Land development and alterations of the ecosystem in south Florida over the past 100 years have decreased freshwater and increased nutrient flows into many of Florida's estuaries, bays, and coastal regions. As a result, there has been a decrease in the water quality in many of these critical habitats, often prompting seagrass die-offs and reduced fish and aquatic life...
Authors
Mark Erik Hansen, Nancy T. DeWitt, Billy J. Reynolds