Download or read book Physical Processes in the Littoral Zone of a Large Lake and the Implications for Water Quality written by Derek Charles Roberts and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The littoral zone of large lakes is home to some of the greatest concentrations of freshwater biodiversity and represents the area of contact between the lakes and human activity. Despite the importance of this nearshore area, it is poorly understood, due, in part, to the diversity of superimposed processes governing water quality and ecosystem function in this highly complex and spatio-temporally variable area. This dissertation quantifies the role of several in-lake, physical processes in driving nearshore water quality variability in Lake Tahoe, CA/NV, including wind waves, upwelling, surface seiches, and inflow mixing dynamics. Given the unique characteristics of each lake’s shoreline, there is no fully generalizable understanding of lake littoral zones; this dissertation may best serve as an example of the roles of various physical processes in the nearshore of one lake and of some approaches for quantifying their impacts in many lakes. Wind waves are shown to be the primary driver of elevated turbidity in the nearshore of Lake Tahoe. Two years of turbidity data collected at five littoral sites show that elevated nearshore turbidity is reasonably predicted by preceding wind speed and direction, and that these patterns are well delineated by a model-predicted threshold for sediment resuspension. Application of this model shows that nearshore sediment resuspension is more prevalent in the fall and winter months (October – March) and on the prevailing downwind north and east shores. These patterns vary interannually due to shifts in both the direction and magnitude of the prevailing winds. The dynamics of spring upwelling events are detailed using an array of temperature, current, and water quality measurements. Observations show that large magnitude upwelling (~80 m) may advect nitrate into the nearshore, but that these concentrations appear to downwell to depth prior to the arrival of post-upwelling internal wave fronts that would potentially dilute these concentrations, depositing a residual nutrient load in the littoral zone. Resonant, basin-scale surface oscillation modes are characterized using a finite-element numerical model and a spatially distributed set of high-frequency pressure measurements. The magnitude of these surface seiche oscillations is greatest on shallow shelves (on the order of 5 cm). Main-basin seiche modes are expressed in peripherally attached water bodies (marinas, wetlands, bays), implying the presence of a reversing flow at the mouths of these semi-enclosed areas. This reversing flow is directly quantified at the mouth of Emerald Bay, where low-magnitude surface oscillations play a major role in cross-sill flows. The impact of watershed loads is not directly quantified. However, a relationship between winter climate conditions and in-lake inflow mixing dynamics is established. Winters with lower snowpack are shown to lead to an increased proportion of annual inflows entering the lake at neutral to positive buoyancy, favoring nearshore and near-surface mixing of associated loads. Given trends toward warmer winters in the Tahoe basin, this trend should be considered in any appraisal of future nearshore conditions at Lake Tahoe. The chapters of this dissertation serve as building blocks toward a better understanding of lake littoral zones and, in particular, Lake Tahoe’s nearshore area. Extended investigations of the processes described above are suggested in the conclusions section of this dissertation; the availability of data to support these investigations, collected as part of this dissertation, is also described.
Download or read book Physical Processes in Lakes and Oceans written by Jorg Imberger and published by American Geophysical Union. This book was released on 1998 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coastal Physical Processes in the Great Lakes written by and published by . This book was released on 2005 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Quality Engineering in Natural Systems written by David A. Chin and published by John Wiley & Sons. This book was released on 2006-05-19 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: FOCUSING ON CONTAMINANT FATE AND TRANSPORT, DESIGN OF ENVIRONMENTAL-CONTROL SYSTEMS, AND REGULATORY CONSTRAINTS This textbook details the fundamental equations that describe the fate and transport of contaminantsin the water environment. The application of these fundamental equations to the design of environmental-control systems and methodologies for assessing the impact of contaminant discharges into rivers, lakes, wetlands, ground water, and oceans are all covered. Readers learn to assess how much waste can be safely assimilatedinto a water body by developing a solid understanding of the relationship between the type of pollutant discharged, the characteristics of the receiving water, and physical, chemical, and biological impacts. In cases of surface runoff from urban and agricultural watersheds, quantitative relationships between the quality of surface runoff and the characteristics of contaminant sources located within the watersheds are presented. Some of the text's distinguishing features include its emphasis on the engineering design of systems that control the fate and transport of contaminants in the water environment, the design of remediation systems, and regulatory constraints. Particular attention is given to use-attainability analyses and the estimation of total maximum daily loads, both of which are essential components of water-quality control in natural systems. Readers are provided with a thorough explanation of the complex set of laws and regulations governing water-quality control in the United States. Proven as an effective textbook in several offerings of the author's class "Water Quality Control in Natural Systems," the flow of the text is carefully structured to facilitate learning. Moreover, a number of practical pedagogical tools are offered: * Practical examples used throughout the text illustrate the effects of controlling the quality, quantity, timing, and distribution of contaminant discharges into the environment * End-of-chapter problems, and an accompanying solutions manual, help readers assess their grasp of each topic as they progress through the text * Several appendices with useful reference material are provided, including current U.S. Water Quality Standards * Detailed bibliography guides readers to additional resources to explore particular topics in greater depth With its emphasis on contaminant fate and transport and design of environmental-control systems, this text is ideal for upper-level undergraduates and graduate students in environmental and civil engineering programs.Environmental scientists and practicing environmental/civil engineers will also find the text relevant and useful.
Download or read book Characteristics and implications of surface gravity waves in the littoral zone of a large lake Lake Constance written by Hilmar Hofmann and published by Cuvillier Verlag. This book was released on 2008-08-29 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary This thesis is the first long-term investigation that gives a detailed characterization of the surface wave field including small-amplitude waves with a high temporal resolution in a lacustrine environment. In Lake Constance, wind as well as ship waves contribute to the overall wave field, whereas ship waves are as important as wind waves on an annual scale and even dominate the wave field during summer. The specific occurrence and properties of wind and ship waves cause different temporal patterns and have various implications on sediment resuspension and the underwater light climate, which in turn affect biotic processes in the littoral ecosystem. The results of this thesis demonstrate the strong linkages between physical processes and biological conditions, which supports the need of integrated research.
Download or read book Hydrodynamics and Water Quality written by Zhen-Gang Ji and published by John Wiley & Sons. This book was released on 2017-07-05 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary reference for the modeling of hydrodynamics and water quality in rivers, lake, estuaries, coastal waters, and wetlands This comprehensive text perfectly illustrates the principles, basic processes, mathematical descriptions, case studies, and practical applications associated with surface waters. It focuses on solving practical problems in rivers, lakes, estuaries, coastal waters, and wetlands. Most of the theories and technical approaches presented within have been implemented in mathematical models and applied to solve practical problems. Throughout the book, case studies are presented to demonstrate how the basic theories and technical approaches are implemented into models, and how these models are applied to solve practical environmental/water resources problems. This new edition of Hydrodynamics and Water Quality: Modeling Rivers, Lakes, and Estuaries has been updated with more than 40% new information. It features several new chapters, including one devoted to shallow water processes in wetlands as well as another focused on extreme value theory and environmental risk analysis. It is also supplemented with a new website that provides files needed for sample applications, such as source codes, executable codes, input files, output files, model manuals, reports, technical notes, and utility programs. This new edition of the book: Includes more than 120 new/updated figures and 450 references Covers state-of-the-art hydrodynamics, sediment transport, toxics fate and transport, and water quality in surface waters Provides essential and updated information on mathematical models Focuses on how to solve practical problems in surface waters—presenting basic theories and technical approaches so that mathematical models can be understood and applied to simulate processes in surface waters Hailed as “a great addition to any university library” by the Journal of the American Water Resources Association (July 2009), Hydrodynamics and Water Quality, Second Edition is an essential reference for practicing engineers, scientists, and water resource managers worldwide.
Download or read book Lake and Reservoir Management written by North American Lake Management Society. Conference and published by . This book was released on 1984 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecological Effects of Water level Fluctuations in Lakes written by Karl M. Wantzen and published by Springer Science & Business Media. This book was released on 2009-05-06 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most aquatic ecosystems have variable water levels. These water-level fluctuations (WLF) have multiple effects on the organisms above and below the waterline. Natural WLF patterns in lakes guarantee both productivity and biodiversity, while untimely floods and droughts may have negative effects. Human impacts on WLF have led to a stabilization of the water levels of many lakes by hydraulic regulation, untimely drawdown due to water use, or floods due to water release from hydropower plants in the catchments. This book provides a first review in this field. It presents selected papers on the ecological effects of WLF in lakes, resulting from a workshop at the University of Konstanz in winter 2005. Issues addressed here include the extent of WLF, and analyses of their effects on different groups of biota from microorganisms to vertebrates. Applied issues include recommendations for the hydrological management of regulated lakes to reduce negative impacts, and a conceptual framework is delivered by an extension of the floodpulse concept for lakes. Current impacts on water use, including increasing demands on drinking and irrigation water, hydropower etc., and climate change effects on WLF make this book an essential resource for aquatic ecologists, engineers, and decision-makers dealing with the management of lake ecosystems and their catchments.
Download or read book Nearshore Areas of the Great Lakes 2009 written by and published by . This book was released on 2009 with total page 120 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 1991 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sustainable Fisheries Management written by E. Eric Knudsen and published by CRC Press. This book was released on 2020-02-10 with total page 745 pages. Available in PDF, EPUB and Kindle. Book excerpt: What has happened to the salmon resource in the Pacific Northwest? Who is responsible and what can be done to reverse the decline in salmon populations? The responsibly falls on everyone involved - fishermen, resource managers and concerned citizens alike - to take the steps necessary to ensure that salmon populations make a full recovery. T
Download or read book Physical Processes in a Long Narrow Deep Lake written by Seth Avram Schweitzer and published by . This book was released on 2015 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the transport processes in lakes and other aquatic systems is vitally important since much of the living biomass is transported by the water, along with nutrients, contaminants, suspended particles, and other materials important to biogeochemical processes. The hydrodynamic processes therefore determine the environmental conditions that affect the biogeochemistry. The physical processes that control the hydrodynamics of large lakes are complex, and depend on a balance of characteristics of the lake (geometry, stratification, etc.) and forcing conditions (meteorological, hydrological) that change over various spatial and temporal scales. Using data from several extensive field campaigns, including measurements of velocity and thermal structure at multiple locations over several seasons, an extensive set of CTD data, and a 15 year long bi-weekly water quality dataset at multiple locations, we analyze the physical forces controlling the dynamics of a large, narrow and deep lake, and the response of the lake to these forces. The study site is Cayuga Lake, the second largest of the Finger Lakes of central New York State, USA (latitude 43N). It is a long (60 km), narrow (less than 6 km) and deep (maximum 130 m) lake. The bathymetry at the south end of the lake slopes up to a shallow shelf, not unlike a coastal estuary, which receives discharges from both natural and anthropogenic sources, and on which sharp spatial and temporal gradients in water quality exist. The geometry of the lake and the prevailing winds in the region lead to the generation of large amplitude internal waves, which develop to be highly nonlinear. Shoaling of these waves on the southern shelf are shown to lead to the intermittent upwelling of hypolim- netic water on to the shelf, creating sharp spatial gradients in water quality (e.g., TP and chlorophyll-a concentrations) on the shelf. We analyze the internal wave field of the lake and the nonlinear processes associated with it, and the factors that lead to the sharp spatial gradients observed on the shelf. We show that a subtle balance of forces controls mixing and transport in the various regions of the lake and propose an explanation for a persistent anomaly in chlorophyll-a concentration observed in one region of the lake.
Download or read book Marine Research 1973 written by United States. National Oceanic and Atmospheric Administration and published by . This book was released on 1973 with total page 1200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Research written by and published by . This book was released on 1973 with total page 1200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lake Tahoe Watershed Assessment Untitled written by and published by . This book was released on 2000 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lake Kinneret Research written by V. Arad and published by . This book was released on 1998 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Eutrophication of Shallow Lakes with Special Reference to Lake Taihu China written by B. Qin and published by Springer Science & Business Media. This book was released on 2007-12-03 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume features papers presented at the International Symposium on the Eutrophication Process and Control in Large Shallow Lakes-–with Special Reference to Lake Taihu, held in Nanjing, China in April 2005. Coverage includes: physical processes and their effects on shallow lake ecosystems; biogeochemistry of sediments and nutrient cycling in shallow lakes; and algal blooms and ecosystem response in shallow lakes.
