Sediment Workgroup
Upcoming Meetings
No upcoming meetings.
Scope and Purpose
The Sediment Workgroup has been sunsetted. When active the Sediment Workgroup provided technical and policy-related assistance to the Chesapeake Bay Program partners to meet Chesapeake 2000 sediment goals. Objectives wereto:
- Continue to compile, interpret and explain sediment science as it relates to the watershed and the Bay.
- Evaluate the relative contribution of sediment by source (upland, riverine, tidal erosion – includes shoreline erosion and shallow water re-suspension) to water clarity degradation.
- Compile and evaluate information on sediment reduction BMPs in tidal areas, in-stream and floodplains.
- Assist with the allocation of sediment loads by source and identification of the sources in the Watershed Model by tributary.
- Provide technical assistance to help jurisdictions evaluate, refine and implement their tributary strategies to meet sediment allocation goals.
Projects and Resources
Fine Sediment and the Chesapeake Bay Watershed Workshop Proceedings
The “ultimate” long-term source of sediment in the Chesapeake Bay watershed has historically been hillslope erosion. This remains true in the contemporary landscape. Erosion and the resultant sediment loadings generated within and moving out of the watersheds draining to the Chesapeake Bay remain problematically high. They are not only high during periods of urban construction and on actively tilled cropland, but can also be found to exceed estimated historic “background” erosion rates in all land cover conditions and lithologic settings within the region. This trend is partly due to the effects from historic episodes of anthropogenic disturbance in many locations. The contemporary erosion rates carry economic costs in terms of agricultural land conservation and stream management, and can create problematic conditions for aquatic communities and downstream depositional environments, including the Chesapeake Bay.
Sediment Research Needs
This document synthesizes sediment research needs through February 2007. Findings from these research projects should help address the numerous sediment information gaps discussed during the STAC 2007 Sedimentsheds Workshop and also identified in “A Summary Report of Sediment Processes in the Chesapeake Bay and Watershed”.
An Introduction to Sedimentsheds: Sediment and Its Relationship to Chesapeake Bay Water Clarity
Suspended sediment is identified as one of several factors that contribute to decreased water clarity and subsequent stress on the SAV in the near-shore area of the Bay. There are many complex, poorly understood processes which impact transport of the finest sediments in an estuarine environment. It is these finest sediment particles that cause water clarity impairments. To determine the source of the sediment impacting water clarity a “sedimentshed” concept is applied. The sedimentshed is defined as the area, including upland, near-shore and sub-aqueous areas that contributes the sediment load that directly influences water clarity in SAV growing areas. The determination of sedimentsheds are expected to play a critical role in understanding where sediment originates and aid in setting an appropriate geographic frame of reference for setting/revising sediment cap allocations by 2010.
Best Management Practices for Sediment Control and Water Clarity Enhancement
The Chesapeake Bay Program (CBP) hosted a workshop in Annapolis, Maryland on February 24-25, 2003, at which sediment experts shared information related to sediment best management practices (BMPs). The information presented on selected BMPs has been summarized in this document, and is intended to assist the CBP’s Sediment Workgroup (SedWG) and others as they move to the next generation of sediment controls and other practices to improve water clarity in riverine, tidal and near shore areas. In order to provide a thorough summary of each BMP to the workgroup, experts from within the CBP community have contributed to the presenters’ information. Each final BMP summary has received the approval of the expert who presented the information at the workshop.
Sediment in the Chesapeake Bay and Management Issues: Tidal Erosion Processes
Sediment is the third biggest pollutant to the Bay and its tributaries. Tidal sediment comprises approximately 57% of the sediment load to the Bay. Excess sediment is a key contributor to degraded water clarity and damages critical habitats (e.g. SAV beds and oyster bars) and living resources (shellfish, finfish and waterfowl). This report provides information on important tidal sediment processes and factors to consider before undertaking shoreline management actions to reduce tidal sediment loads. It provides maps and other general data to help target problem areas and identify valuable living resources where sediment reduction activities could help improve water clarity.
Members
Jeffrey Halka (Chair), U.S. Geological Survey (USGS)
2300 Saint Paul Street
Baltimore, Maryland 21218
Email: jhalka@dnr.state.md
Phone: (410) 554-5503
Lewis Linker (Coordinator), Modeling Coordinator, U.S. Environmental Protection Agency
1750 Forest Drive Suite 130
Annapolis, Maryland 21401
Email: linker.lewis@epa.gov
Phone: (410) 267-5741
Victoria Kilbert (Staffer), Chesapeake Research Consortium
410 Severn Ave
Suite 112
Annapolis, Maryland 21403
Email: vkilbert@chesapeakebay.net
Phone: (410) 267-5753
Joe Berg, Biohabitats
2081 Clipper Park Road
Baltimore, Maryland 21211
Email: jberg@biohabitats.com
Phone: 410.554.0156
Grace Brush, John Hopkins University
Ames Hall 303
Johns Hopkins University
Baltimore, Maryland 21218
Email: gbrush@jhu.edu
Phone: (410) 516-7107