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Author: Anthony S. Donigian
Publisher:
ISBN:
Category : Chesapeake Bay (Md. and Va.)
Languages : en
Pages : 0
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Book Description
The focus of this research was to improve the overall utility of the Chesapeake Bay Watershed Model, based on the U.S. Environmental Protection Agency Hydrologic Simulation Program-Fortran model, as a planning tool for comprehensive watershed planning and assessment The Chesapeake Bay Watershed Model is a unique state of-the-art watershed modeling capability that includes detailed soil process simulation for agricultural areas, linked to an instream water quality and nutrient model capable of representing comprehensive point and nonpoint pollutant loadings for the entire 68,000 square mile drainage area of the Chesapeake Bay The specific improvements recommended and tasks performed in this effort included development of nutrient balances for nonagricultural land uses; testing of the application procedures for forest, pasture, and urban land uses; and application of the enhanced model to the Shenandoah Subbasin within the Chesapeake Bay watershed to assess load contributions and impacts of the model refinements. The real benefits of the current refinement phase of the Chesapeake Bay Program Watershed Model are realized from the extension of the nutrient balance approach to all major land use (except urban, in the simulations) and the utility of this approach for nutrient management.
Author: Anthony S. Donigian
Publisher:
ISBN:
Category : Chesapeake Bay (Md. and Va.)
Languages : en
Pages : 0
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Book Description
The focus of this research was to improve the overall utility of the Chesapeake Bay Watershed Model, based on the U.S. Environmental Protection Agency Hydrologic Simulation Program-Fortran model, as a planning tool for comprehensive watershed planning and assessment The Chesapeake Bay Watershed Model is a unique state of-the-art watershed modeling capability that includes detailed soil process simulation for agricultural areas, linked to an instream water quality and nutrient model capable of representing comprehensive point and nonpoint pollutant loadings for the entire 68,000 square mile drainage area of the Chesapeake Bay The specific improvements recommended and tasks performed in this effort included development of nutrient balances for nonagricultural land uses; testing of the application procedures for forest, pasture, and urban land uses; and application of the enhanced model to the Shenandoah Subbasin within the Chesapeake Bay watershed to assess load contributions and impacts of the model refinements. The real benefits of the current refinement phase of the Chesapeake Bay Program Watershed Model are realized from the extension of the nutrient balance approach to all major land use (except urban, in the simulations) and the utility of this approach for nutrient management.
Author: Anthony S. Donigian
Publisher:
ISBN:
Category : Chesapeake Bay (Md. and Va.)
Languages : en
Pages : 118
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Book Description
The focus of this research was to improve the overall utility of the Chesapeake Bay Watershed Model, based on the U.S. Environmental Protection Agency Hydrologic Simulation Program-Fortran model, as a planning tool for comprehensive watershed planning and assessment The Chesapeake Bay Watershed Model is a unique state of-the-art watershed modeling capability that includes detailed soil process simulation for agricultural areas, linked to an instream water quality and nutrient model capable of representing comprehensive point and nonpoint pollutant loadings for the entire 68,000 square mile drainage area of the Chesapeake Bay The specific improvements recommended and tasks performed in this effort included development of nutrient balances for nonagricultural land uses; testing of the application procedures for forest, pasture, and urban land uses; and application of the enhanced model to the Shenandoah Subbasin within the Chesapeake Bay watershed to assess load contributions and impacts of the model refinements. The real benefits of the current refinement phase of the Chesapeake Bay Program Watershed Model are realized from the extension of the nutrient balance approach to all major land use (except urban, in the simulations) and the utility of this approach for nutrient management.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309210828
Category : Political Science
Languages : en
Pages : 258
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Book Description
The Chesapeake Bay is North America's largest and most biologically diverse estuary, as well as an important commercial and recreational resource. However, excessive amounts of nitrogen, phosphorus, and sediment from human activities and land development have disrupted the ecosystem, causing harmful algae blooms, degraded habitats, and diminished populations of many species of fish and shellfish. In 1983, the Chesapeake Bay Program (CBP) was established, based on a cooperative partnership among the U.S. Environmental Protection Agency (EPA), the state of Maryland, and the commonwealths of Pennsylvania and Virginia, and the District of Columbia, to address the extent, complexity, and sources of pollutants entering the Bay. In 2008, the CBP launched a series of initiatives to increase the transparency of the program and heighten its accountability and in 2009 an executive order injected new energy into the restoration. In addition, as part of the effect to improve the pace of progress and increase accountability in the Bay restoration, a two-year milestone strategy was introduced aimed at reducing overall pollution in the Bay by focusing on incremental, short-term commitments from each of the Bay jurisdictions. The National Research Council (NRC) established the Committee on the Evaluation of Chesapeake Bay Program Implementation for Nutrient Reduction in Improve Water Quality in 2009 in response to a request from the EPA. The committee was charged to assess the framework used by the states and the CBP for tracking nutrient and sediment control practices that are implemented in the Chesapeake Bay watershed and to evaluate the two-year milestone strategy. The committee was also to assess existing adaptive management strategies and to recommend improvements that could help CBP to meet its nutrient and sediment reduction goals. The committee did not attempt to identify every possible strategy that could be implemented but instead focused on approaches that are not being implemented to their full potential or that may have substantial, unrealized potential in the Bay watershed. Because many of these strategies have policy or societal implications that could not be fully evaluated by the committee, the strategies are not prioritized but are offered to encourage further consideration and exploration among the CBP partners and stakeholders.
Author: Anthony S. Donigian
Publisher:
ISBN:
Category : Chesapeake Bay (Md. and Va.)
Languages : en
Pages : 0
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The focus of this research work was to improve the overall utility of the Chesapeake Bay Watershed Model, based on the U.S. Environmental Protection Agency Hydrologic Simulation Program-Fortran (HSPF) model, as a planning tool for comprehensive watershed planning and assessment The specific improvements recommended and tasks performed in this effort included refinement of the agricultural (AGCHEM) module simulation to better represent plant uptake impacts of agricultural practices and nutrient management scenarios, testing the AGCHEM refinements, applying the refined AGCHEM to selected subbasins of the Chesapeake Bay drainage, and recalibrating the refined Watershed Model to the selected subbasins.
Author: Stephen D. Preston
Publisher:
ISBN:
Category : Nitrates
Languages : en
Pages : 12
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Book Description
Author: Anthony S. Donigian
Publisher:
ISBN:
Category : Chesapeake Bay (Md. and Va.)
Languages : en
Pages : 244
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Book Description
The focus of this research work was to improve the overall utility of the Chesapeake Bay Watershed Model, based on the U.S. Environmental Protection Agency Hydrologic Simulation Program-Fortran (HSPF) model, as a planning tool for comprehensive watershed planning and assessment The specific improvements recommended and tasks performed in this effort included refinement of the agricultural (AGCHEM) module simulation to better represent plant uptake impacts of agricultural practices and nutrient management scenarios, testing the AGCHEM refinements, applying the refined AGCHEM to selected subbasins of the Chesapeake Bay drainage, and recalibrating the refined Watershed Model to the selected subbasins.
Author: Chesapeake Bay Program (U.S.). Nutrient Reevaluation Workgroup
Publisher:
ISBN:
Category : Environmental policy
Languages : en
Pages : 86
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Author: Arghajeet Saha
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Manure management is a major sustainability challenge in livestock-intensive agricultural regions, a product of the specialization and intensification of modern production systems. Nutrient imbalance and excess application of manure to field crops in the livestock intensive regions of Susquehanna River Basin (SRB) has led to nutrient enrichment in its local waters, as well as in surface waters delivered to the Chesapeake Bay. The delivery of excess nutrients from the SRB is significant in generating hypoxic water conditions in the Bay. Notwithstanding having more than 30 years of research and funding invested in improving the water quality of the Chesapeake Bay, the overall health continues to remain degraded. Restoration of the Bay is essential and requires inventive nutrient management approaches to control the nutrient loadings at various spatial and temporal scales in the SRB. Improving sustainable manure nutrient management in the SRB can play a vital role in reducing excess nitrogen (N) and phosphorus (P) loads delivered to the Bay. The overarching goal of our research was to develop manure nutrient management strategies for SRB and to quantify the potential water quality benefits derived from the strategies through scenario-based simulation modeling analyses. A comprehensive Soil and Water Assessment Tool (SWAT) model was developed for SRB and used for scenario analysis. To aid in model development, we devised a new taxonomically based soil dataset that minimized problems associated with many soil types and misrepresentations of soil identifiers across political borders in SSURGO data. The direct application of SSURGO increases spatial discretization in model which will increase computational cost. The developed taxonomic soil data acted as a suitable alternative since it was computationally efficient, in addition to being comparable to SSURGO in its representation of soil, hydrological and water quality metrics. The SRB SWAT model was developed to represent land use, land management and conservation practices, and fertilizer sources commonly prevalent in the watershed. The comprehensive SWAT model was able to represent over 144,473 spatial simulation units across the watershed. The first set of six manure nutrient management scenarios was based on the 'manureshed' concept, developed towards generating sustainable manure balanced systems by connecting crop areas (nutrient sinks) with livestock agriculture (nutrient sources). The manureshed scenarios conceptualized were (i) "Business-as-usual" which assumes manure is not transportable across sub-watershed boundaries and some areas have excess manure application than crop demand, (ii) "Watershed nutrient balance" which assumes excess manure from surplus areas are transportable and applied to crop areas based on nutrient demand, (iii) "Watershed nutrient balance avoiding runoff prone areas" which assumes manure is transportable and applied based on agronomic demand, but not applied in vulnerable landscapes. Manure application rates were calculated considering both N-based and P-based crop nutrient demands, totaling six manure application scenarios. The N-based business-as-usual scenario was considered as the model baseline. The crop N-based manure application applied excess P and P-based application needed supplemental N inorganic fertilizer application to meet crop nutrient demand. The manure redistribution scenarios decreased nutrient loads at the watershed outlet compared to the baseline. The P-based manureshed scenarios reduced manure nutrient (N and P) loadings (3% -25.2%) at the watershed outlet. P-based manuresheds that reallocated manure throughout the SRB based on agronomic P need and avoiding runoff prone areas satisfied agronomic need throughout the SRB and reduced inorganic fertilizer use to supplemental N. The second set of nutrient management scenarios aimed to explore the potential water quality impacts of manure application strategies considering the 4Rs of nutrient stewardship i.e., manure of right quantity applied at the right time and right place. A manure application timing scenario was developed considering antecedent moisture conditions and precipitation potential after manure application. The results compared with the business-as-usual baseline indicated that strategically timed nutrient application considering weather and nutrient demand lowered loading at the SRB outlet by 4% for N and 6% for P. Winter closure for manure having spring only application across the SRB showed an increase in crop nutrient uptake and yield and reduced annual nutrient loads delivered to the Bay from SRB. An incorporation scenario, where manure was applied below 10 mm in the soil, increased nitrate loss through leachate but showed significant reduction (9-53%) in nutrient (N and P) loss through surface runoff compared to the baseline. The practical application of this research would involve the utilization of results by policy planners, working groups, and landowners for developing sustainable nutrient management plans. However, successful implementation of this research will also be dependent of local level cost, science available for successful implementation, and engagement of farming communities.
Author: Scott W. Ator
Publisher: Geological Survey (USGS)
ISBN: 9781411332621
Category : Chesapeake Bay Watershed
Languages : en
Pages : 27
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Spatially Referenced Regression on Watershed Attributes (SPARROW) was used to provide empirical estimates of the sources, fate, and transport of total nitrogen (TN) and total phosphorus (TP) in the Chesapeake Bay watershed, and the mean annual TN and TP flux to the bay and in each of 80,579 nontidal tributary stream reaches. Restoration efforts in recent decades have been insufficient to meet established standards for water quality and ecological conditions in Chesapeake Bay. The bay watershed includes 166,000 square kilometers of mixed land uses, multiple nutrient sources, and variable hydrogeologic, soil, and weather conditions, and bay restoration is complicated by the multitude of nutrient sources and complex interacting factors affecting the occurrence, fate, and transport of nitrogen and phosphorus from source areas to streams and the estuary. Effective and efficient nutrient management at the regional scale in support of Chesapeake Bay restoration requires a comprehensive understanding of the sources, fate, and transport of nitrogen and phosphorus in the watershed, which is only available through regional models. The current models, Chesapeake Bay nutrient SPARROW models, version 4 (CBTN_v4 and CBTP_v4), were constructed at a finer spatial resolution than previous SPARROW models for the Chesapeake Bay watershed (versions 1, 2, and 3), and include an updated timeframe and modified sources and other explantory terms.
Author:
Publisher:
ISBN:
Category : Chesapeake Bay (Md. and Va.)
Languages : en
Pages : 14
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