Geology topics
S.J. Williams
Publications and source records attributed to S.J. Williams.
Abatement of wetland loss in Louisiana through diversions of Mississippi River water using siphons
Explore the source record for details and available documents.
National Coastal Geology Program: Status of research activities, FY 1992
No abstract available.
Louisiana Coastal Geographic Information System Network, year two final report
Explore the source record for details and available documents.
Sea-level rise and its implications to coastal planning and management
No abstract available.
Access to spatial environmental data for development of an oil spill response geographic
No abstract available.
Shoreline changes of the Isles Dernieres barrier island arc, Louisiana, from 1853 to 1989
Explore the source record for details and available documents.
Geologic controls on the formation and evolution of quaternary coastal deposits of the northern Gulf of Mexico
A study of the barrier islands and wetlands in the deltaic plain of Louisiana is presented. Its purpose was to document rapid changes and to learn more about the processes responsible and the geologic framework within which they operate. It included systematic collection and analysis of precision nearshore hydrographic data, high resolution seismic profiles, surface sediment samples, continuous vibracores, digital shoreline plots, records of storm overwash events, and analysis of tide gage records to quantify the rise in relative sea level. Results from these studies demonstrate that deltaic progradation, river channel switching, and subsequent rapid erosion accompanying the marine transgression are regular and predictable events along the Mississippi River delta plain and will likely continue in the future. Mitigation measures, such as shoreline nourishment and barrier restoration, that mimic the natural processes may slow the land loss.
Loss of coastal wetlands in Louisiana: Cooperative research to assess the critical processes
Erosion of the nation's shoreline and loss and deterioration of our coastal wetlands are widespread and serious problems that affect all regions of the US. As a result of natural and human-induced factors, the coastal plain of Louisiana, which contains 40% of the tidal wetlands in the conterminous 48 States, is undergoing the greatest amount of coastal erosion and wetlands loss in the nation. The barrier islands that provide a natural buffer for Louisiana's deltaic plain environments are experiencing erosion rates of 20m/yr, while wetlands losses are about 100km2/yr. In response to these problems and the lack of scientific understanding of the processes causing erosion and land loss, the US Geological Survey has, since 1986, conducted field investigations in Louisiana, working closely with the US Fish and Wildlife Service and other Federal and State agencies.
Surficial sediment isopleth maps of sand, silt, and clay, offshore the Isles Dernieres barrier islands, Louisiana
No abstract available.
Map showing distribution of surficial sediments on the inner continental shelf off central Louisiana
Explore the source record for details and available documents.
Geologic framework and sand resources of Quaternary deposits offshore Virginia, Cape Henry to Virginia Beach
Explore the source record for details and available documents.
SAND SOURCES FOR THE TRANSGRESSIVE BARRIER COAST OF LONG ISLAND, NEW YORK: EVIDENCE FOR LANDWARD TRANSPORT OF SHELF SEDIMENTS.
During investigations of the regional geologic framework of Long Island shelf by means of seismic-reflection profiles and cores, Williams (1976) identified a rather limited area on the shelf off Jones Beach where Upper Cretaceous or early Tertiary age glauconite-rich lithosomes subcrop at the seabed, seaward of the shoreface. A suite of beach samples from Montauk Point to Rockaway Beach, cores from the shelf that penetrated the glauconitic strata, and grab samples along a shore-normal transect from the shelf to the beach were analyzed to determine if shelf sediments are being eroded and transported landward, and are contributing to the littoral sand budget along the Long Island coast. Results of this study using glauconite as a natural tracer of sediment transport show that under present oceanographic conditions, and probably throughout the Holocene transgression, the inner continental shelf has been an important source of sediment for the Long Island barrier beaches.