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Earthquake recurrence estimates for northern Caribbean faults from combinatorial optimization

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Woods Hole Coastal and Marine Science Center

2023 Annual Report

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Pragmatically mapping Phragmites with unoccupied aerial systems: A comparison of invasive species land cover classification using RGB and multispectral imagery

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Hydroacoustic observations reveal drivers of mixing and salinization of a karst subterranean estuary during intense precipitation

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Pragmatically mapping Phragmites with unoccupied aerial systems: A comparison of invasive species land cover classification using RGB and multispectral imagery

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Woods Hole Coastal and Marine Science Center—2023 Annual Report. The 2023 annual report highlights accomplishments, includes a list of publications, and summarizes the work of the center and each of the science groups.

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Coastal and Marine Research News from Across the USGS

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January 1, 2003

Mercury contamination chronologies from Connecticut wetlands and Long Island Sound sediments Mercury contamination chronologies from Connecticut wetlands and Long Island Sound sediments

Sediment cores were used to investigate the mercury deposition histories of Connecticut and Long Island Sound. Most cores show background (pre-1800s) concentrations (50–100 ppb Hg) below 30–50 cm depth, strong enrichments up to 500 ppb Hg in the core tops with lower Hg concentrations in the surface sediments (200–300 ppb Hg). A sediment core from the Housatonic River has peak levels of 1...

Authors

J.C. Varekamp, B. Kreulen, Marilyn R. Buchholtz ten Brink, E.L. Mecray

Woods Hole Coastal and Marine Science Center

January 1, 2003

Winter-time circulation and sediment transport in the Hudson Shelf Valley Winter-time circulation and sediment transport in the Hudson Shelf Valley

The Hudson Shelf Valley is a bathymetric low that extends across the continental shelf offshore of New York and New Jersey. From December 1999 to April 2000 a field experiment was carried out to investigate the transport of sediment in the shelf and valley system. Near-bed tripods and water-column moorings were deployed at water depths from 38 to 75 m in the axis of the shelf valley and...

Authors

C. K. Harris, B. Butman, P. Traykovski

Woods Hole Coastal and Marine Science Center

January 1, 2003

Eutrophication and carbon sources in Chesapeake Bay over the last 2700 yr: Human impacts in context Eutrophication and carbon sources in Chesapeake Bay over the last 2700 yr: Human impacts in context

To compare natural variability and trends in a developed estuary with human-influenced patterns, stable isotope ratios (δ13C and δ15N) were measured in sediments from five piston cores collected in Chesapeake Bay. Mixing of terrestrial and algal carbon sources primarily controls patterns of δ13Corg profiles, so this proxy shows changes in estuary productivity and in delivery of...

Authors

J.F. Bratton, Steven M. Colman, R.R. Seal

Chesapeake Bay Activities, Woods Hole Coastal and Marine Science Center

January 1, 2003

The west-central Florida inner shelf and coastal system: A geologic conceptual overview and introduction to the special issue The west-central Florida inner shelf and coastal system: A geologic conceptual overview and introduction to the special issue

This paper provides an overview for this special publication on the geologic framework of the inner shelf and coastal zone of west-central Florida. This is a significant geologic setting in that it lies at the center of an ancient carbonate platform facing an enormous ramp that has exerted large-scale control on coastal geomorphology, the availability of sediments, and the level of wave...

Authors

A. C. Hine, G. R. Brooks, R.A. Davis, D.S. Duncan, S. D. Locker, D.C. Twichell, G. Gelfenbaum

Woods Hole Coastal and Marine Science Center

January 1, 2003

Anthropogenically induced changes in sediment and biogenic silica fluxes in Chesapeake Bay Anthropogenically induced changes in sediment and biogenic silica fluxes in Chesapeake Bay

Sediment cores as long as 20 m, dated by 14C, 210Pb, and 137Cs methods and pollen stratigraphy, provide a history of diatom productivity and sediment-accumulation rates in Chesapeake Bay. We calculated the flux of biogenic silica and total sediment for the past 1500 yr for two high-sedimentation-rate sites in the mesohaline section of the bay. The data show that biogenic silica flux to...

Authors

Steven M. Colman, J.F. Bratton

Chesapeake Bay Activities, Woods Hole Coastal and Marine Science Center

January 1, 2003

Birth of the modern Chesapeake Bay estuary between 7.4 and 8.2 ka and implications for global sea-level rise Birth of the modern Chesapeake Bay estuary between 7.4 and 8.2 ka and implications for global sea-level rise

Two major pulses of sea-level rise are thought to have taken place since the last glacial maximum — meltwater pulses (mwp) 1A (12 cal ka) and 1B (9.5 cal ka). Between mwp 1B and about 6 cal ka, many of the complex coastal ecosystems which ring the world’s oceans began to form. Here we report data for rhenium, carbon isotopes, total organic carbon, and fossil oysters from Chesapeake Bay...

Authors

John F. Bratton, Steven M. Colman, E. Robert Thieler, Robert R. Seal

Chesapeake Bay Activities, Woods Hole Coastal and Marine Science Center

January 1, 2003

Mobile fishing gear reduces benthic megafaunal production on Georges Bank Mobile fishing gear reduces benthic megafaunal production on Georges Bank

This study addresses the effect of mobile fishing gear disturbance on benthic megafaunal production on the gravel pavement of northern Georges Bank. From 1994 to 2000, we sampled benthic megafauna with a 1 m Naturalists' dredge at shallow (47 to 62 m) and deep (80 to 90 m) sites. The cessation of fishing in large areas of Georges Bank in January 1995 allowed us to monitor changes in...

Authors

J.M. Hermsen, J.S. Collie, P. C. Valentine

Woods Hole Coastal and Marine Science Center

January 1, 2003

Sand ridges off Sarasota, Florida: A complex facies boundary on a low-energy inner shelf environment Sand ridges off Sarasota, Florida: A complex facies boundary on a low-energy inner shelf environment

The innermost shelf off Sarasota, Florida was mapped using sidescan-sonar imagery, seismic-reflection profiles, surface sediment samples, and short cores to define the transition between an onshore siliciclastic sand province and an offshore carbonate province and to identify the processes controlling the distribution of these distinctive facies. The transition between these facies is...

Authors

D. Twichell, Gillian L. Brooks, G. Gelfenbaum, V. Paskevich, Brian Donahue

Woods Hole Coastal and Marine Science Center

January 1, 2003

Sediment-starved sand ridges on a mixed carbonate/siliciclastic inner shelf off west-central Florida Sediment-starved sand ridges on a mixed carbonate/siliciclastic inner shelf off west-central Florida

High-resolution side-scan mosaics, sediment analyses, and physical process data have revealed that the mixed carbonate/siliciclastic, inner shelf of west-central Florida supports a highly complex field of active sand ridges mantled by a hierarchy of bedforms. The sand ridges, mostly oriented obliquely to the shoreline trend, extend from 2 km to over 25 km offshore. They show many...

Authors

S. E. Harrison, S. D. Locker, A. C. Hine, J.H. Edwards, D. F. Naar, D.C. Twichell, D. J. Mallinson

Woods Hole Coastal and Marine Science Center

January 1, 2003

Stratigraphic framework of sediment-starved sand ridges on a mixed siliciclastic/carbonate inner shelf; west-central Florida Stratigraphic framework of sediment-starved sand ridges on a mixed siliciclastic/carbonate inner shelf; west-central Florida

Seismic reflection profiles and vibracores have revealed that an inner shelf, sand-ridge field has developed over the past few thousand years situated on an elevated, broad bedrock terrace. This terrace extends seaward of a major headland associated with the modern barrier-island coastline of west-central Florida. The overall geologic setting is a low-energy, sediment-starved, mixed...

Authors

J.H. Edwards, S. E. Harrison, S. D. Locker, A. C. Hine, D.C. Twichell

Woods Hole Coastal and Marine Science Center

January 1, 2003

Real-time seismic data from the coastal ocean Real-time seismic data from the coastal ocean

A moored-buoy system for collecting real-time seismic data from the coastal ocean has been developed and will be deployed for its initial field trial in the fall of 2003. The key component in this moored system is an ultra-stretchy mooring hose that provides compliance for waves and currents and protects the electrical conductors connecting an Ocean Bottom Seismometer (OBS) to a surface...

Authors

D. Frye, Uri S. ten Brink, W. Paul, K. Peal, K. Von Der Heydt

Woods Hole Coastal and Marine Science Center

January 1, 2003

Coastal vulnerability assessment of Cape Cod National Seashore to sea-level rise Coastal vulnerability assessment of Cape Cod National Seashore to sea-level rise

A coastal vulnerability index (CVI) was used to map the relative vulnerability of the coast to future sea-level rise within the Cape Cod National Seashore (CACO). The CVI ranks the following in terms of their physical contribution to sea-level rise-related coastal change: geomorphology, regional coastal slope, rate of relative sea-level rise, shoreline change rates, mean tidal range and...

Authors

Erika S. Hammar-Klose, Elizabeth A. Pendleton, E. Robert Thieler, S. Jeffress Williams

Woods Hole Coastal and Marine Science Center