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EBookClubs

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Book Dynamic Modelling of Dissolved Oxygen

Download or read book Dynamic Modelling of Dissolved Oxygen written by Brian A. Cox and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Modeling Coastal Hypoxia

Download or read book Modeling Coastal Hypoxia written by Dubravko Justic and published by Springer. This book was released on 2017-05-03 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a snapshot of representative modeling analyses of coastal hypoxia and its effects. Hypoxia refers to conditions in the water column where dissolved oxygen falls below levels that can support most metazoan marine life (i.e., 2 mg O2 l-1). The number of hypoxic zones has been increasing at an exponential rate since the 1960s; there are currently more than 600 documented hypoxic zones in the estuarine and coastal waters worldwide. Hypoxia develops as a synergistic product of many physical and biological factors that affect the balance of dissolved oxygen in seawater, including temperature, solar radiation, wind, freshwater discharge, nutrient supply, and the production and decay of organic matter. A number of modeling approaches have been increasingly used in hypoxia research, along with the more traditional observational and experimental studies. Modeling is necessary because of rapidly changing coastal circulation and stratification patterns that affect hypoxia, the large spatial extent over which hypoxia develops, and limitations on our capabilities to directly measure hypoxia over large spatial and temporal scales. This book consists of 15 chapters that are broadly organized around three main topics: (1) Modeling of the physical controls on hypoxia, (2) Modeling of biogeochemical controls and feedbacks, and, (3) Modeling of the ecological effects of hypoxia. The final chapter is a synthesis chapter that draws generalities from the earlier chapters, highlights strengths and weaknesses of the current state-of-the-art modeling, and offers recommendations on future directions.

Book Dissolved Oxygen Dynamics and Modeling a Case Study in a Subtropical Shallow Lake

Download or read book Dissolved Oxygen Dynamics and Modeling a Case Study in a Subtropical Shallow Lake written by Zhen Xu and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book High Accuracy Surface Modeling Method The Robustness

Download or read book High Accuracy Surface Modeling Method The Robustness written by Na Zhao and published by Springer Nature. This book was released on 2021-08-11 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the robustness analysis of high accuracy surface modeling method (HASM) to yield good performance of it. Understanding the sensitivity and uncertainty is important in model applications. The book aims to advance an integral framework for assessing model error that can demonstrate robustness across sets of possible controls, variable definitions, standard error, algorithm structure, and functional forms. It is an essential reference to the most promising numerical models. In areas where there is less certainty about models, but also high expectations of transparency, robustness analysis should aspire to be as broad as possible. This book also contains a chapter at the end featuring applications in climate simulation illustrating different implementations of HASM in surface modeling. The book is helpful for people involved in geographical information science, ecological informatics, geography, earth observation, and planetary surface modeling.

Book Computational Fluid Dynamics Modelling of Dissolved Oxygen in Oxidation Ditches

Download or read book Computational Fluid Dynamics Modelling of Dissolved Oxygen in Oxidation Ditches written by T. Matko and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Computational Fluid Dynamics Approach for Dissolved Oxygen Modelling with Application to Wind powered Aeration Systems

Download or read book A Computational Fluid Dynamics Approach for Dissolved Oxygen Modelling with Application to Wind powered Aeration Systems written by Kamran Mahmudov and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dissolved oxygen is one of the most critical parameters of water quality in aquaculture. Aeration systems are generally used to improve oxygen levels and yields. However, these systems have high capital and operating cost, require electricity and, thus, are out of reach for farmers in developing countries. There is a need for affordable and sustainable aeration technologies. This thesis presents the development of a computational dissolved oxygen model which evaluates the spatial and temporal distribution of dissolved oxygen to enable evaluation and optimization of new aeration approaches. The three-dimensional model was developed based on Finite Volume Method and validated by bench-scale and field experiments. Results showed that the model was capable of predicting the dissolved oxygen concentration with an average prediction error of 7.2%.

Book Biological Reaction Engineering

Download or read book Biological Reaction Engineering written by Irving J. Dunn and published by Wiley-VCH Verlag GmbH. This book was released on 2003 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Table of contents

Book Dynamics of Environmental Bioprocesses

Download or read book Dynamics of Environmental Bioprocesses written by Jonathan B. Snape and published by John Wiley & Sons. This book was released on 2008-07-11 with total page 515 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic environmental processes are complex; the easiest and most effective way to understanding them lies through the disciplines of dynamic modelling and computer simulation. The prerequisite modelling fundamentals are presented in the first chapter in a manner comprehensible to students as well as to practising scientists and engineers. The second chapter describes the many environmental processes that lend themselves to modelling, for example pollution and wastewater treatment. The third part of the book provides 65 simulation examples both on the page and on an accompanying diskette in the simulation language ISIM - the first time that this has been done with a teaching book in this field - ready-to-run on any DOS personal computer. Crucially, the simulation runs can be interrupted to allow rapid interactive parameter changes and easy plotting of results; this enables the reader to get a feel for the model and system behaviour.

Book A Statistical Model for the Prediction of Dissolved Oxygen Dynamics and the Potential for Hypoxia in the Mississippi Sound and Bight

Download or read book A Statistical Model for the Prediction of Dissolved Oxygen Dynamics and the Potential for Hypoxia in the Mississippi Sound and Bight written by Andreas Michael Moshogianis and published by . This book was released on 2015 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hypoxia events occur when dissolved oxygen concentrations fall below the minimum threshold (dissolved oxygen concentrations

Book Large eddy Simulation and Modelling of Dissolved Oxygen Transport and Depletion in Water Bodies

Download or read book Large eddy Simulation and Modelling of Dissolved Oxygen Transport and Depletion in Water Bodies written by Carlo Scalo and published by . This book was released on 2012 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the present doctoral work we have developed and tested a model for dissolved oxygen (DO) transfer from water to underlying flat and cohesive sediment beds populated with DO-absorbing bacteria. The model couples Large-Eddy Simulation (LES) of turbulent transport in the water-column, a biogeochemical model for DO transport and consumption in the sediment, and Darcy's Law for the pore water-driven solute dispersion and advection. The model's predictions compare well against experimental data for low friction-Reynolds numbers (Re). The disagreement for higher Re is investigated by progressively increasing the complexity of the model. A sensitivity analysis shows that the sediment-oxygen uptake (or demand, SOD) is approximately proportional to the bacterial content of the sediment layer, and varies with respect to fluid dynamics conditions, in accordance to classic high-Schmidt-number mass-transfer laws. The non- linear transport dynamics responsible for sustaining a statistically steady SOD are investigated by temporal- and-spatial correlations and with the aid of instantaneous visualizations: the near-wall coherent structures modulate the diffusive sublayer, which exhibits complex spatial and temporal filtering behaviours; its slow and quasi-periodic regeneration cycle determines the streaky structure of the DO field at the sediment-water interface (SWI), retained in the deeper layers of the porous medium. Oxygen depletion dynamics are then simulated by preventing surface re-areation with turbulent mixing driven by an oscillating low-speed current - an idealization of hypolimnetic DO depletion in the presence of a non-equilibrium periodic forcing. The oxygen distribution exhibits a self-similar pattern of decay with, during the deceleration phase, oscillations modulated by the periodic ejection of peaks of high turbulent mass flux (pumping oxygen towards the SWI), generated at the edge of the diffusive sublayer at the end of the acceleration phase. These fronts of highly turbulent mixing propagate away from the SWI, at approximately constant speed, in layers of below-average oxygen concentration. Finally, the model has been tested in a real geophysical framework, reproducing published in-situ DO measurements of a transitional flow in the bottom boundary layer of lake Alpnach. A simple model for the SOD is then derived for eventual inclusion in RANSE biogeochemical management-type models for similar applications.

Book Dissolved Oxygen Dynamics

Download or read book Dissolved Oxygen Dynamics written by and published by . This book was released on 1972 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Dynamic Modeling of Environmental Systems

Download or read book Dynamic Modeling of Environmental Systems written by Michael L. Deaton and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: A primer on modeling concepts and applications that is specifically geared toward the environmental field. Sections on modeling terminology, the uses of models, the model-building process, and the interpretation of output provide the foundation for detailed applications. After an introduction to the basics of dynamic modeling, the book leads students through an analysis of several environmental problems, including surface-water pollution, matter-cycling disruptions, and global warming. The scientific and technical context is provided for each problem, and the methods for analyzing and designing appropriate modeling approaches is provided. While the mathematical content does not exceed the level of a first-semester calculus course, the book gives students all of the background, examples, and practice exercises needed both to use and understand environmental modeling. It is suitable for upper-level undergraduate and beginning-graduate level environmental professionals seeking an introduction to modeling in their field.