Download or read book Calibration and Verification of a Two dimensional Laterally Averaged Mechanistic Model of the Neuse River Estuary written by Jeffrey Hieronymus and published by . This book was released on 2004 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Papers from the 15th Estuarine and Coastal Modeling Conference written by Richard P. Signell and published by MDPI. This book was released on 2019-07-30 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue Selected Papers from the 15th Estuarine and Coastal Modeling Conference that was published in JMSE
Download or read book Calibration and Verification of a Two dimensional Depth Averaged Hydrodynamic Model for Modeling Flow Around Bendway Weirs in a Mild Gradient Sand Bed River written by Brian Gregory Wardman and published by . This book was released on 2007 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neuse River Estuary Modeling and Monitoring Project Stage 1 written by James D. Bowen and published by . This book was released on 2000 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of a Laterally Averaged Two dimensional Model for a Tidal Channel written by Sergio Eiger and published by . This book was released on 1985 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ce Qual W2 written by James L. Martin and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Grid Scale on the Calibration of Two dimension River Models Through the Drag Coefficient written by Rachel Elizabeth Chisolm and published by . This book was released on 2011 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: New survey technologies are able to provide detailed data on the form and topography of riverbeds. With this increased data resolution, the required computational time rather than data availability has become the limiting factor for river models. Detailed bathymetric data can be used to provide better empirical representation of drag and roughness at fine scales, allowing a priori selection of roughness using known physics rather than a posteriori calibration. However, we do not have sufficient guidance or understanding from the literature to represent known heterogeneities smaller than our practical grid scale. The problem is what to do with known subgrid-scale bathymetric features and roughness when our models must use a coarser computational grid. In this project, we simplify this complex problem to analyzing flow in a simple open channel with a single patch of relatively high roughness against an otherwise uniform background of low roughness. We model this open channel with a two-dimensional, depth-averaged river model. By running multiple simulations using different grid sizes we gain insight into how the relationship between the grid cell size and the patch size affects the appropriate physical selection of roughness parameter. As the primary focus, the present work proposes and investigates several methods for upscaling known fine-scale drag coefficient data to a coarser grid resolution for a model. For the tested conditions, it appears that a simple area-weighted linear average is simple to apply and creates a flow field very similar to the best results achieved by calibration. As a secondary issue, the present work examines grid-dependent behaviors when using model calibration. Although recalibration of models for different grid scales is a common practice among modelers, we could find relatively little documentation or analysis. In our work, we examine both single-cell calibration (i.e. changing roughness in only the cell containing the rough patch) and multiple-grid cell calibration involving neighbor cells. With either method, improving calibration required multiple model simulations and comparative analysis for each tested grid size and was inefficient compared to the upscaling approach. As expected, the calibration at a given grid size was always inappropriate for a different grid size.
Download or read book Mathematical Modeling and Parameter Identification in a Two dimensional Estuary written by Wen-sen Chu and published by . This book was released on 1981 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Calibration of a Two dimensional Hydrodynamic Model for Parts of the Allegheny Monongahela and Ohio Rivers Allegheny County Pennsylvania written by John W. Fulton and published by . This book was released on 2014 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Depth averaged Two dimensional Water Quality Model as a Research and Management Tool written by Tingting Zhu and published by . This book was released on 2006 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sediments have been identified as one of the leading non-point source pollutants since 1980's. The contaminated sediments pose threats to human health, environment and ecosystems. Total Maximum Daily Load (TMDL) and Best Management Practice (BMP) are two major water quality management measures. To fully study the water quality problems and guide the design of TMDL and BMP, a comprehensive two-dimensional depth-averaged water quality model framework for freshwaters was developed. The model framework comprises of three newly developed models: cohesive sediment transport model, water quality model (eutrophication model), and chemical fate and transport model. These three models were integrated with a robust hydrodynamic and non-cohesive sediment transport model, CCHE2D. The model development followed the steps of process formulation, model coding, model verification and validation. These three models are based on the state-of-the-art mechanisms of major physical, chemical, bio-chemical processes of freshwater systems. Each model was constructed independently in a modular structure so that it is flexible to meet the needs of site-specific problems and is easy to be updated and improved. The models were first verified by analytical solutions and then validated using six lab and field cases. Several empirical formulae for cohesive sediments were examined and found that there is a big uncertainty in the prediction of bed shear strength. A simple linear relationship for bed shear strength was found to fit well with the measurement for newly deposited cohesive sediment. Incorporation of the impact of suspended sediments into the general water quality model extends its capability of simulating the sediment-laden water bodies with higher accuracy. The model can be used to carry out numerical sensitivity analysis to find out how the system responds to different levels of suspended sediment concentration. The integrated flow, cohesive and non-cohesive sediment transport model, chemical fate and transport model was applied to the study of Upper Hudson River PCBs. The long term simulation of PCBs shows satisfactory agreement with the measurement. The comprehensive model framework was demonstrated for its capabilities. The real world water quality problems associated with sediments are ready to be solved.
Download or read book Impacts of Lateral Flows on the Calibration of 2D Flood Inundation Models written by Nazife Oruc Baci and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional hydrodynamic models are one of the most commonly used tools for flood inundation mapping. Conventionally, the upstream and downstream flows (or water surface elevation) are used as boundary conditions of these models and the roughness coefficients and channel bathymetry information are calibrated to improve the performance of model simulations compared to reference data. In a recent study, we demonstrated that including lateral flows (and vertical fluxes) as additional boundary conditions can significantly improve the accuracy of simulated floods. Lateral flows refer to a combination of pointwise (tributaries) and distributed flows (direct runoff) added from the side to the channel. To further test the robustness and reliability of this modified boundary conditioning approach, this study aims to specifically investigate the impacts of including lateral flows on the calibrated parameters of 2D hydrodynamic models. We perform a multi-phase calibration based on both in-situ time series data at a gauge and a reference flood extent map provided by Federal Emergency Management Agency (FEMA). Using both gauge and flood extent reference data and eight different validation measures, we provide a comprehensive analysis of the spatio-temporal behavior of simulated floods. We found that including these additional boundary conditions does not necessarily change the calibrated roughness parameters. Including lateral flows, however, significantly affects the calibrated offset parameter used to characterize the channel bathymetry. Our results also demonstrate that changing the offset parameter of river bathymetry mostly affects the flood depth distribution and its dynamics while it rarely changes the flood extent maps provided by hydrodynamic models.
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 Rates Constants and Kinetics Formulations in Surface Water Quality Modeling written by Environmental Research Laboratory (Athens, Ga.) and published by . This book was released on 1978 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cyanobacterial Harmful Algal Blooms State of the Science and Research Needs written by H. Kenneth Hudnell and published by Springer Science & Business Media. This book was released on 2008-03-13 with total page 955 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the ever-increasing incidence of harmful cyanobacterial algal blooms, this monograph has added urgency and will be essential reading for all sorts of researchers, from neuroscientists to cancer research specialists. The volume contains the proceedings of the 2005 International Symposium on Cyanobacterial Harmful Algal Blooms, and has been edited by H. Kenneth Hudnell, of the US Environmental Protection Agency. It contains much of the most recent research into the subject.
Download or read book Nutrient Criteria Technical Guidance Manual written by and published by . This book was released on 2000 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Food Webs written by Andrea Belgrano and published by Oxford University Press, USA. This book was released on 2005 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: 'Aquatic Food Webs' provides a current synthesis of theoretical and empirical food web research. The textbook is suitable for graduate level students as well as professional researchers in community, ecosystem, and theoretical ecology, in aquatic ecology, and in conservation biology.
Download or read book Fish and Fisheries Management in Lakes and Reservoirs written by and published by . This book was released on 1993 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
