Download or read book Environmental Impact Research Program Coupling Hydrodynamics to a Multiple Box Water Quality Model written by Sandra L. Bird and published by . This book was released on 1988 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Long-term, multidimensional water quality modeling, using directly linked hydrodynamic and water quality models, can become prohibitively expensive. In this report, fine scale, short time-step hydrodynamic model output is linked with coarse grid, longer time-step multiple-box water quality model. The formulation, limitations, and adaption for use in applications of the Water Quality Analysis Simulation Program (WASP), the US Environmental Protection Agency multiple-box model, are discussed. Linkage of the multiple-box model to two hydrodynamic models is explained. Dye tracer simulations are used to compare mass transport by the box model with mass transport by the directly linked models for three applications: Savannah River Estuary, Mississippi Sound, and DeGray Lake. Keywords: Numerical methods.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1989 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1989 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coupling Hydrodynamics to a Multiple box Water Quality Model written by Sandra Lee Bird and published by . This book was released on 1988 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1988-07 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Quality Modeling written by Wu-Seng Lung and published by CRC Press. This book was released on 1993-07-29 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume to discussing the various aspects of estuarine water quality modeling. Topics considered include fundamental principles, estuarine mass transport, BOD/DO and eutrophication model kinetics, kinetics on toxicants, and sediment-water interactions. The book also discusses mixing zone modeling and how to integrate estuarine hydrodynamic and water quality models. Many case studies demonstrating successful model applications are discussed.
Download or read book Linked Hydrodynamic and Biogeochemical Models of Water Quality in Shallow Lakes written by Peter Shanahan and published by . This book was released on 1982 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: Approaches to lake water quality modeling are critically examined with particular attention to the formulation of water quality transport as the link between hydrodynamics and biogeochemical reaction. A linked water quality model for shallow lakes includes three major components: a biogeochemical reaction component, a lake hydrodynamics component and a water quality transport component. State-of-the-art modeling approaches for each component are reviewed, and a synopsis of phosphorus dynamics in shallow lakes is given. For the water quality transport component, review of the literature shows two significantly different approaches to water transport: a lumped component approach based upon multiple fully-mixed boxes, and a continuum approach employing the finite difference method to approximate the continuous governing equations. The multiple-box model is shown in an analysis of the kindred fully-mixed tanks-in-series conceptual reactor model to create an excessive implicit dispersion due to its formulation. This leads to a model in which the model mass transport is not closely related to the properties of the physical system. being modeled. Rather, dispersive transport in the model is shown to depend heavily upon the model formulation -- the model transport parameters thus cannot be specified from hydrodynamic data but must be found by calibration. In direct contrast, the finite difference model maintains a far closer approximation to the physical system and permits direct specification of water quality transport from the actual lake hydrodynamics. To support these arguments, a computer program incorporating both a multiple-box model and an alternative one-dimensional finite difference model is developed and applied to Lake Balaton in Hungary. The biogeochemical component of both models is a four component phosphorus-phytoplankton interaction model originally proposed by van Straten (1980). Hydrodynamic information is supplied to the one-dimensional finite difference model by linkage to a transient two-dimensional single-layer model of wind-driven circulation. A one-dimensional dispersion coefficient is computed from the two-dimensional velocity field using a method based upon that of Fischer (1966, 1969) and Holley, Harleman and Fischer (1970), but proceeding from the assumption that advection rather than turbulent diffusion dominates lateral mixing. The finite difference model developed for Lake Balaton consists of forty grids and is used to simulate a representative period from early spring to late summer. The results are contrasted with those produced by a four-box model of the lake using long-term average advection and calibrated dispersive exchange flows. The finite difference model is found to lead to a predicted behavior more similar to that observed in field data collected from Lake Balaton. Experimentation with the models is conducted to examine the behavior of the lake and the dominant factors leading to that behavior.
Download or read book Coupling the Hydrodynamic and Water Quality Model CE QUAL W2 with a Multi trophic Fish Bio energetics Model for Lake Roosevelt Washington written by Michael Lee McKillip and published by . This book was released on 2008 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1994-11 with total page 1796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Impact Research Program Computer Modeling of Hydrodynamics and Solute Transport in Canals and Marinas Literature Review and Guidelines for Future Development written by Raymond Walton and published by . This book was released on 1983 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review of modeling the hydrodynamics and solute transport processes in tidal canals and marinas is presented. There is still much to be learned to enable the engineer to design such systems to meet a rational set of design criteria. a program of measurements to understand the fundamental physics of these systems is proposed, and the development of numerical models to address research and design needs is outlined. (Author).
Download or read book Government Reports Annual Index written by and published by . This book was released on 1988 with total page 1428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1976 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1976 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Review of the New York City Watershed Protection Program written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2020-12-04 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: New York City's municipal water supply system provides about 1 billion gallons of drinking water a day to over 8.5 million people in New York City and about 1 million people living in nearby Westchester, Putnam, Ulster, and Orange counties. The combined water supply system includes 19 reservoirs and three controlled lakes with a total storage capacity of approximately 580 billion gallons. The city's Watershed Protection Program is intended to maintain and enhance the high quality of these surface water sources. Review of the New York City Watershed Protection Program assesses the efficacy and future of New York City's watershed management activities. The report identifies program areas that may require future change or action, including continued efforts to address turbidity and responding to changes in reservoir water quality as a result of climate change.
Download or read book Clean Coastal Waters written by National Research Council and published by National Academies Press. This book was released on 2000-08-17 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental problems in coastal ecosystems can sometimes be attributed to excess nutrients flowing from upstream watersheds into estuarine settings. This nutrient over-enrichment can result in toxic algal blooms, shellfish poisoning, coral reef destruction, and other harmful outcomes. All U.S. coasts show signs of nutrient over-enrichment, and scientists predict worsening problems in the years ahead. Clean Coastal Waters explains technical aspects of nutrient over-enrichment and proposes both immediate local action by coastal managers and a longer-term national strategy incorporating policy design, classification of affected sites, law and regulation, coordination, and communication. Highlighting the Gulf of Mexico's "Dead Zone," the Pfiesteria outbreak in a tributary of Chesapeake Bay, and other cases, the book explains how nutrients work in the environment, why nitrogen is important, how enrichment turns into over-enrichment, and why some environments are especially susceptible. Economic as well as ecological impacts are examined. In addressing abatement strategies, the committee discusses the importance of monitoring sites, developing useful models of over-enrichment, and setting water quality goals. The book also reviews voluntary programs, mandatory controls, tax incentives, and other policy options for reducing the flow of nutrients from agricultural operations and other sources.
Download or read book HEC 6 written by and published by . This book was released on 1995 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Graduate Studies written by and published by . This book was released on 1978 with total page 896 pages. Available in PDF, EPUB and Kindle. Book excerpt:
