Publications

The second SAV Technical Synthesis revises and updates the first synthesis, by providing new light requirements for SAV through the water column and at the leaf surface, providing diagnostic tools for their application and interpretation, and identifying preliminary sets of physical, chemical, and other biological habitat requirements.

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This document contains Appendixes to the NRT cost report titled Nutrient Reduction Technology Cost Estimations for Point-Sources in the Chesapeake Bay Watershed.

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This report is to provide costs estimates for treatment technologies associated with varying concentration levels of nitrogen and phosphorus removal from industrial and municipal wastewater plants in the Chesapeake Bay watershed. The data will be used by the Chesapeake Bay Program to estimate costs of nutrient removal programs for all point-source categories across the Bay watershed during the nutrient and sediment water quality criteria and use development process.

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A three-dimensional, time-variable, eutrophication model, CE-QUAL-ICM, was applied to the Chesapeake Bay. The model incorporated 22 state variables that included physical properties, multiple forms of algae, carbon, nitrogen, phosphorus, and silica, and dissolved xoygen. The model was part of a larger package that included a three-dimensional hydrodynamic model and a benthic sediment diagenesis model

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This is the updated Guide to accompany the current Living Resources Biological Monitoring Data. Guide topics include: obtaining data, data structures, CIMS compliant data dictionaries, and helpful hints to better interpret this specialized group of monitoring data.

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During the past several years, considerable attention has been directed at the potential environmental impacts of agriculture in the Chesapeake Bay Watershed. A primary focus has been on the potential nutrient loadings to surface and groundwater resulting from animal agricultural sources. There is an emerging body of science-based information on the formulation of animal rations that have the potential to cost-effectively achieve the objectives of producers and also result in potential reductions in the nutrient content of manures at the point of excrement. The Chesapeake Bay Program's Agricultural Nutrient Reduction Workgroup planned a technology exchange of the latest advances in animal nutrition and the ability of these advances to provide cost-effective tools to reduce the nutrient content of animal waste at the point of excrement.

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This report highlights the Federal activities for Bay restoration and stewardship from April 1992 to April 1999. This report is the third biennial report of the progress made by Federal agencies on the commitments made in the 1994 and 1998 Federal Bay agreements

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This document summarizes the ideas and goals from this working session. These ideas and goals will be considered for the Toxics Strategy (2000) and the Chesapeake Bay Agreement(2000).

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The validation and subsequent application of the current three dimensional numerical hydrodynamic model of Chesapeake Bay is presented. The numerical model solves conservation equations for water mass, momentum, salinity, and heat on a boundary-fitted grid in the horizontal plane. The vertical grid is Cartesian. A finite-difference solution scheme is employed such that vertically-averaged equations are first solved to yield the water surface elevations. These are then utilized in the computation of the barotropic portion of the horizontal pressure gradient in the internal mode. Model validation was accomplished by demonstrating the model's ability to reproduce observed data over times scales ranging from tidal to seasonal periods. After validation, the model was applied to simulate bay hydrodynamics for the 10 years of 1985-1994. These results were used to drive the three-dimensional water quality model of Chesapeake Bay, which is discussed in a companion paper.

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A predictive model of submerged aquatic vegetation (SAV) biomass is coupled to a eutrophication model of the Chesapeake Bay. Domain of the model includes the mainstem of the bay as well as tidal portions of the major embayments and tributaries. Three SAV communities are modeled: Zostera, Ruppia, and freshwater. The model successfully computes the spatial distribution and abundance of SAV for the period 1985-1994. Spatial distribution is primarily determined by computed light attenuation. Sensitivity analysis to reductions in nutrient and solids loads indicates nutrient controls will enhance abundance primarily in areas that presently support SAV. Restoration of SAV to areas in which it does not presently exist requires solids controls, alone or in combination with nutrient controls

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