Application of a Two-dimensional Model of Hydrodynamics and Water Quality (CE-QUAL-W2) to Cordell Hull Reservoir, Tennessee PDF Download
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Author: Stacy E. Howington Publisher: ISBN: Category : CE-QUAL-W2 (Mathematical model) Languages : en Pages : 138
Book Description
Although not problematic within this reservoir, unacceptably low dissolved oxygen concentrations farther downstream in the system of reservoirs in the Cumberland River Basin have caused concern. This model study was undertaken to evaluate the water quality (specifically temperature and dissolved oxygen) impacts of operational changes at individual reservoir outlet structures. The study was also designed to reveal the interactions between hydrodynamics and stratification within the reservoir. Unstable stratification is thought to be responsible for additional problems in the reservoir: absence of an anticipated substantial fishery and a less than desirable amount of contact recreation. The concept of installing submerged weirs at the mouths of two of the reservoir's embayments within an established recreational site was proposed to help alleviate these 2 problems. As Cordell Hull Lock and Dam operates as a run-of-the-river navigation project on the main-stem Cumberland River, no significant operational changes at this site are possible. The reservoir is characterized by high flows, intermittent moderate to weak thermal stratification, and a relatively shallow pool. These factors combine, as was demonstrated by the model testing results, to preclude significant control over the release quality characteristics. However, the advective nature of the reservoir presents an advantage. Any changes to the quality of incoming water of Cordell Hull Reservoir will be propagated downstream, largely intact. (EDC).
Author: Stacy E. Howington Publisher: ISBN: Category : CE-QUAL-W2 (Mathematical model) Languages : en Pages : 138
Book Description
Although not problematic within this reservoir, unacceptably low dissolved oxygen concentrations farther downstream in the system of reservoirs in the Cumberland River Basin have caused concern. This model study was undertaken to evaluate the water quality (specifically temperature and dissolved oxygen) impacts of operational changes at individual reservoir outlet structures. The study was also designed to reveal the interactions between hydrodynamics and stratification within the reservoir. Unstable stratification is thought to be responsible for additional problems in the reservoir: absence of an anticipated substantial fishery and a less than desirable amount of contact recreation. The concept of installing submerged weirs at the mouths of two of the reservoir's embayments within an established recreational site was proposed to help alleviate these 2 problems. As Cordell Hull Lock and Dam operates as a run-of-the-river navigation project on the main-stem Cumberland River, no significant operational changes at this site are possible. The reservoir is characterized by high flows, intermittent moderate to weak thermal stratification, and a relatively shallow pool. These factors combine, as was demonstrated by the model testing results, to preclude significant control over the release quality characteristics. However, the advective nature of the reservoir presents an advantage. Any changes to the quality of incoming water of Cordell Hull Reservoir will be propagated downstream, largely intact. (EDC).
Author: Ulrich Sommer Publisher: Springer Science & Business Media ISBN: 3642748902 Category : Science Languages : en Pages : 378
Book Description
All relevant ecological aspects of plankton, especially seasonal changes in the species composition, the role of competition for limiting resources in species replacements, the role of parasitism, predation and competition in seasonal succession are treated in detail considering phytoplankton, zooplankton and bacteroplankton. In addition to its use as a valid reference book for plankton ecology, this monograph may well be used as a model for other kinds of ecological communities.
Author: John Anthony Christ Publisher: ISBN: Category : Languages : en Pages : 632
Book Description
Among the most intractable environmental remediation problems are those involving the release of dense non-aqueous phase liquids (DNAPLs), such as chlorinated solvents, to the subsurface. Research efforts have focused on the use of numerical models to investigate reductions in contaminant concentrations due to partial mass removal and improvements in the performance of complementary source zone remediation technologies. Previous numerical investigations, however, have been limited to two-dimensional systems. Furthermore, a lack of models capable of simulating the most promising complementary technology, metabolic reductive dechlorination, has limited its application. This work developed and applied compositional multiphase numerical simulators to examine the influence of dimensionality (two-dimensions versus three-dimensions) on DNAPL source zone simulations and to investigate the benefits of stimulating metabolic reductive dechlorination at a chlorinated ethene-DNAPL contaminated site. Results from the dimensionality investigation showed that the simulation of DNAPL migration, entrapment, and dissolution in two dimensions provided reasonable approximations to the behavior simulated in three dimensions. Commonly employed saturation distribution and mass recovery metrics were approximately equivalent. Flux- averaged concentrations simulated in two dimensions, however, tended to be three to four times higher than those simulated in three dimensions. This difference was attributed to dilution at the down gradient boundary. An alternative metric, mass flux reduction, however, yielded better agreement.
Author: J. G. Tundisi Publisher: ISBN: Category : Limnology Languages : en Pages : 600
Book Description
Reservoir design and operation: limnological implications and management opportunities. Self-organization, direct and indirect effects. Main processes in the water column determined by wind and rainfall at Lobo (Broa) Reservoir: implications for phosphorus cycling. The relationship between fish yield and stocking density in reservoirs from tropical and temperate regions. Suspended clay: its role in reservoir productivity. Predictability of seasonal and diel events in tropical and temperate lakes and reservoirs. Heat bidgets, thermal structure and dissolved oxygen in Brazilian reservoirs. Numerical modelling and reservoir management: applications of the DYRESM model. A simplified 2D-vertical plane numerical solution for reservoir flows. Seasonal horizontal gra dients of dissolved oxygen in a temperate austral reservoir. Patterns of colonization in neotropical reservoirs, and prognoses on aging. Impacts of protistan grazing on bacterial dynamics and composition in reservoirs of different trophy. Limnological aspects of Sicilian reservoirs: a comparative, ecosystemic approach. Longitudinal processes in Canyon type reservoirs: the case of Sau (N.E. Spain). Limnological differences between a shallow pre-reservoir and a shallow lake: a case study of the Upper Kis-Balaton reservoir and Lake Balaton. Retention time as a key variable of reservoir limnology. The effect of changing flushing rates on development of late summer Aphanizomenon and Microcystis populations in a shallow lake, Muggelsee, Berlin, Germany. The cascading reservoir continuum concept (CRCC) and its application to the river Tiete-basin, Sao Paulo State, Brazil. Phytoplankton assemblages in reservoirs. Ecological theory applied to reservoir zooplankton. The species richness of reservoir plankton and the effect of reservoirs on plankton dispersal (with particular emphasis on rotifers and cladocerans). Water quality and fishery management in lake Kinneret, Israel. Theoretical basis for reservoir management. Fish effects on reservoir trophic relationships. Biomanipulation and ecological modelling. Reservoir ecosystem functioning: theory and application.
Author: Kent W. Thornton Publisher: John Wiley & Sons ISBN: 9780471885016 Category : Science Languages : en Pages : 262
Book Description
Addresses reservoirs as unique ecological systems and presents research indicating that reservoirs fall into two or three highly concatenated, interactive ecological systems ranging from riverine to lacustrine or hybrid systems. Includes some controversial concepts about the limnology of reservoirs, which make for interesting reading.
Author: Gene E. Likens Publisher: Academic Press ISBN: 0123819997 Category : Science Languages : en Pages : 424
Book Description
A derivative of the Encyclopedia of Inland Waters, River Ecosystem Ecology reviews the function of rivers and streams as ecosystems as well as the varied activities and interactions that occur among their abiotic and biotic components. Because the articles are drawn from an encyclopedia, the articles are easily accessible to interested members of the public, such as conservationists and environmental decision makers. - Includes an up-to-date summary of global aquatic ecosystems and issues - Covers current environmental problems and management solutions - Features full-color figures and tables to support the text and aid in understanding
Author: Stacy E. Howington
Author: Stacy E. Howington
Author: Ulrich Sommer
Author: James L. Martin
Author: 
Author: Lars Håkanson
Author: John Anthony Christ
Author: J. G. Tundisi
Author: Villy Christensen
Author: Kent W. Thornton
Author: Gene E. Likens