Author: Gary F. AndersonPublisher:
ISBN:
Category : Estuarine sediments
Languages : en
Pages :
Book Description
Data Base Development for Characterizing Contaminated Sediments in the Chesapeake Bay Region
Author: Gary F. AndersonPublisher:
ISBN:
Category : Estuarine sediments
Languages : en
Pages : 0
Book Description
This project is one component of the U.S. Geological Survey's National Coastal Geology Program directed to polluted sediments. Its long-term aim is to develop a comprehensive database on estuarine contaminated sediments that provides a summary of information and a digital reference source of detailed and readily accessible data. It focuses on Chesapeake Bay because there is a wealth of data on bottom sediments and sedimentary contaminants. However, this data is fragmented, uncollated and dispersed in many papers, books, reports, files and documents, often local sources, outside the mainstream of national consideration and scientific knowledge. Without an organized body of data, resource managers and research scientists are handicapped in structuring decisions and preparing plans. They may not know what data exists, where to find it and how to obtain it. Potentially valuable data may go unused because it is overlooked, poorly documented or difficult to obtain. To address problems of contaminated sediment the U.S. Geologtcal Survey's Branch of Atlantic Marine Geology (Woods Hole) executed a cooperative agreement in May 1992 with the Virginia Institute of Marine Science. The project aims to structure a PC accessible database for incorporation into CD ROM media. It draws on existing historical data, mainly from published and unpublished "grey" literature spanning the last 55 years. This contrasts to databases of NOAA's Status and Trends Monitoring Program and EPA's Environmental Monitoring and Assessment Program (EMAP) that draw on new data from field surveys. The data sources come from diverse scientific, academic, commercial and government organizations, and from a range of fields including sedimentology, geochemistry, estuarine marine science, pollution and benthic biology. Historical data are of value for evaluating changes caused by dredging and disposal as well as storms and to assess baseline concentrations prior to contamination. Database development of this project consists of four components or tasks: 1. To organize and structure a database with a set of procedures, data dictionary and codebook, formatted for transfer to a CD ROM file, 2. A search for data sources in the literature and in files on bottom sediments and their contaminants, 3. An inventory of relevant data sources according to location, station abundance, occurrence of variables, etc. 4) Compilation of prototype digital data files from selected data sources
Sediment Characterization and Mapping Using High Frequency Acoustic and Core Data in the Chesapeake Bay
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Several locations in the Chesapeake Bay were surveyed with an acoustic seafloor classification system to characterize and delineate areal distribution of surficial sediment properties. Predictions of acoustic impedance using this system provide a capability for initial assessment and prediction of sediment properties during the survey. Color-coded trackline maps created in real-time on a computer monitor represent estimated surficial sediment fades type and location. Analyses of the color-coded maps reveal a diversity of sediment types and distribution at each site and between sites. Thick sediment coverings are predominantly fine grained as identified by low intensity acoustic returns. Thin coverings consist of more dense, granular materials and are identified by higher intensity acoustic returns. Two locations south of the mouth of the Patuxent River and one near the mouth of the Choptank River consist primarily of fine and medium silts to silty clays. These sizes exhibit the lowest impedance levels on the trackline maps. Samples collected at one site slightly inside, and three sites north, of the mouth of the Patuxent River are composed of more dense, granular sands. Higher predicted impedance on the maps are indicative of dense sediments. Acoustically derived impedance predictions have been gridded and contoured to create a color-coded sediment facies province map at one of the sites. This province map provides a representation of relative sediment type and distribution at this site.
Chesapeake Bay Program Technical Studies
Author: Publisher:
ISBN:
Category : Chesapeake Bay (Md. and Va.)
Languages : en
Pages : 668
Book Description
Proceedings of the National Sediment Inventory Workshop, April 26-27, 1994, Dupont Plaza Hotel, Washington, DC
Author: Publisher:
ISBN:
Category : Sedimentation and deposition
Languages : en
Pages : 108
Book Description
Magnitude and Extent of Contaminated Sediment and Toxicity in Chesapeake Bay
Author: S. Ian HartwellPublisher:
ISBN:
Category : Aquatic organisms
Languages : en
Pages : 215
Book Description
"This report summarizes the results of NOAA's sediment toxicity, chemistry, and benthic community studies in the Chesapeake Bay estuary. As part of the National Status and Trends (NS&T) Program, NOAA has conducted studies to determine the spatial extent and severity of chemical contamination and associated adverse biological effects in coastal bays and estuaries of the United States since 1991. Sediment contamination in U.S. coastal areas is a major environmental issue because of its potential toxic effects on biological resources and often, indirectly, on human health. Thus, characterizing and delineating areas of sediment contamination and toxicity and demonstrating their effect(s) on benthic living resources are viewed as important goals of coastal resource management. Benthic community studies have a history of use in regional estuarine monitoring programs and have been shown to be an effective indicator for describing the extent and magnitude of pollution impacts in estuarine ecosystems, as well as for assessing the effectiveness of management actions"--Executive Summary.
Toxicology Research Projects Directory
Author: EPA Publications Bibliography
Author: United States. Environmental Protection AgencyPublisher:
ISBN:
Category : Environmental protection
Languages : en
Pages : 506
Book Description
Sediment Characterization of Chesapeake Bay and Its Tributaries
Author: National Estuarine Inventory (U.S.)Publisher:
ISBN:
Category : Estuarine sediments
Languages : en
Pages : 166
Book Description
Sources, Transport, and Storage of Sediment at Selected Sites in the Chesapeake Bay Watershed
Author: Allen C. GellisPublisher: Geological Survey (USGS)
ISBN: 9781411323605
Category : Sediment transport
Languages : en
Pages : 95
Book Description
Author: