Heidi Wadman
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Use of chirp sub-bottom acoustic profiling to assess the integrity of the submerged portion of the Jonesville Lock and Dam, located at Jonesville, Louisiana Open
Jonesville Lock and Dam serves as a critical navigation conduit along the Black River in Louisiana. The structure has previously been impacted by localized scour, leading to concerns regarding the structure’s long-term integrity and an eff…
Bioturbation increases time averaging despite promoting shell disintegration : a test using anthropogenic gradients in sediment accumulation and burrowing on the southern California shelf Open
Bioturbation increases time averaging of young and old shells within the entire mixed layer and accelerating the burial of shells into a sequestration zone. Bioirrigation by oxygenated pore-water promotes carbonate dissolution in the TAZ, …
Performance of High-Resolution, Acoustic Mapping Systems in a Fluid-Mud Environment : Testing the Effectiveness and Viability of High-Resolution, Hydrographic Survey Systems in a Fluid-Mud Environment Open
This study explores the use of high-resolution acoustic mapping systems to penetrate fluid-mud layers by quantitatively relating depth with operating frequency. Prior to this study, multibeam surveys have proven be an effective method to e…
Use of chirp sub-bottom acoustics to assess integrity of water-control structures : Inner Harbor Navigation Canal Lock, New Orleans Open
The US Army Corps of Engineers (USACE)-maintained lock on the Inner Harbor Navigation Canal serves as a critical navigation link between Lake Pontchartrain to the north and the Mississippi River to the south. Extensive slumping has been ob…
Bioturbation increases time averaging despite promoting shell disintegration: a test using anthropogenic gradients in sediment accumulation and burrowing on the southern California shelf Open
Bioturbation can increase time averaging by downward and upward movements of young and old shells within the entire mixed layer and by accelerating the burial of shells into a sequestration zone (SZ), allowing them to bypass the uppermost …
A Framework for Assessing the Bearing Capacity of Sandy Coastal Soils from Remotely Sensed Moisture Contents Open
The strength of partially saturated sand is critical for addressing engineering challenges such as beach trafficability or coastal erosion. Mapping strength remotely would allow for surficial geotechnical characterization despite reduced s…
Spatial distribution and thickness of fine-grained sediment along the United States portion of the upper Niagara River, New York Open
Over 220 linear miles of geophysical data, including sidescan sonar and chirp sub-bottom profiles, were collected in 2016 and 2017 by the US Army Corps of Engineers and the US Fish and Wildlife Service in the upper Niagara River. In additi…
Framework geology of Cape Shoalwater and northwest Willapa Bay, Washington : assessing potential geologic impacts on recent shoreline change Open
The shoreline along Cape Shoalwater and northwest Willapa Bay has experienced the highest rates of erosion along the entire Pacific Coast of the United States, due in part to rapid northward migration of the navigation channel.Recently, ch…
Fine-grained sediment within Olcott Harbor, Eighteenmile Creek, NY Open
PURPOSE:Olcott Harbor, located at the mouth of Eighteenmile Creek and Lake Ontario, and a Great Lake Area of Concern, provides a temporary sink for contaminated, fine-grained sediment transported downstream from the Superfund site near Loc…
Application of chirp acoustic sub-bottom data in riverine environments : identification of underlying rocky hazards at Cape Girardeau, Missouri, and Thebes, Illinois Open
Shallow acoustic reflection (chirp) data have been utilized to map the elevation of underlying stratigraphy in a wide range of aqueous environments.Of particular concern in riverine regions is the elevation of near-surface underlying rock …
BARRIER ISLAND GROUNDWATER Open
Storms can have long-term impacts on the groundwater flows and subsurface salinity structure in coastal aquifers. Previous studies have shown that tides, wave driven infiltration, and storm surge elevate the groundwater level within the be…
A guide for using geochemical methods in dredged material, sediment tracking, and sediment budget studies Open
Effective regional sediment management has the potential to significantly reduce operating costs for the U.S. Army Corps of Engineers but only if the ultimate sources and sinks of coastal sediment are fully quantified. Geochemical sediment…
Identification of sediment sources to Calumet River through geochemical fingerprinting Open
Geochemical sedimentary markers provide a well-established methodology for fingerprinting various sources of sediments accumulating within a region of concern. To help identify possible sources of contaminated sediment infilling a reach of…
Nearshore sediment thickness, Fire Island, New York Open
First posted April 3, 2017 For additional information, contact: Director, St. Petersburg Coastal and Marine Science Center U.S. Geological Survey 600 4th Street South St. Petersburg, FL 33701 https://coastal.er.usgs.gov/ Investigations of …
A Conceptual Model for Spatial Grain Size Variability on the Surface of and within Beaches Open
Grain size on the surface of natural beaches has been observed to vary spatially and temporally with morphology and wave energy. The stratigraphy of the beach at Duck, North Carolina, USA was examined using 36 vibracores (~1–1.5 m long) co…
Identifying Fossil Shell Resources via Geophysical Surveys: Chesapeake Bay Region, Virginia Open
Methodology capable of identifying fossil oyster shell (FOS) buried under several meters of sediment is needed to quantitatively assess the availability of FOS for oyster reef restoration in Virginia. Evaluated here is the feasibility of u…