Download or read book Factors Influencing the Dissolved Oxygen Balance in Subarctic Streams During Winter Conditions written by Larry V. Dietrick and published by . This book was released on 1975 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Appearance and odors of putrefaction, blackening of water, destruction of major fish life and green plant life and most of the miscellaneous effects associated with gross stream pollution result from the utilization of the stream's oxygen reserve. Extensive studies have been made to date regarding the factors influencing the dissolved oxygen in streams. Unfortunately, the majority of the published reports and present theories have evolved from studies made in more temperate climates. Although the general factors which affect the oxygen balance in temperate climates also exist in subarctic climates the variation in magnitude and effect of these factors results in a unique situation. The simultaneous action of the many oxygen exchange processes often makes separation and study of individual contributing effects difficult under natural conditions. Knowledge of all factors affecting the oxygen balance must, therefore, be evaluated in order to determine which factors predominate in any given situation. In this regard a review was made of existing literature to ascertain current knowledge and techniques concerning factors contributing to the dissolved oxygen regime. A comparison of this was then made to existing information and techniques used in studies on subarctic streams. Finally, an evaluation was made to distinguish and characterize basic differences in the oxygen balance of subarctic streams, particularly during winter conditions. The review and evaluation resulted in several observations. The effects of photosynthesis are generally regarded as negligible during winter conditions in sub-arctic streams. Runoff is also minimal. Significant oxygen demands can be exerted at low temperatures. Discrepancies between the rate of removal of BOD and DO consumption indicate that respiration by aquatic organisms, reduced flows and sedimentation and/or biological extraction are contributing factors. Nitrification during periods of ice cover is not significant. Reaeration in open water stretches can be substantial depending upon the hydrodynamic effects of various ice forms among other things. The addition of oxygen demanding substances to ice-covered streams where the dissolved oxygen concentration is already at a critical level may easily result in anoxic conditions"--Abstract.
Download or read book Study of Dissolved Oxygen at Low Temperatures in Two Sub Arctic Streams written by Tim Arnold Hudson and published by . This book was released on 1974 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Factors Affecting Minimum Dissolved Oxygen Concentration in Streams written by Christopher Robert Huhnke and published by . This book was released on 2018 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling water quality has been shown to be a useful tool in strategizing water quality management. Dissolved oxygen (DO) has one of the largest impacts on water quality compared to other parameters. The purpose of the dissertation research is to generate a regression equation model, using the US EPA QUAL2K model as the base, to determine different factors affecting minimum dissolved oxygen concentrations in streams, to determine the critical distance for the minimum dissolved oxygen concentration, and the magnitude of impact of each parameter. Based on regression analysis, the factors affecting minimum DO in river water are effluent biochemical oxygen demand, effluent flow rate, river flow rate, river temperature, and effluent DO in that order. The simulation study of QUAL2K is related to stream classification and degree of treatment of municipal wastewater. Important factors affecting minimum dissolved oxygen concentrations in streams and corresponding critical distance or critical time in streams, which receive municipal wastewater treatment plant effluent discharge, include effluent BOD, river Q, effluent Q, and river temperature. Based on regression analysis, the factors affecting minimum DO in river water are effluent BOD, effluent Q, river Q, river temperature, and effluent DO, in that order. The application of the end result of this study can be used to determine the degree of municipal wastewater treatment to maintain a desirable stream classification and river water quality.
Download or read book Temperature and Dissolved Oxygen Concentration as Factors Influencing the Secondary Production Rate of Nucula Annulata in Long Island Sound USA written by Kevin D. Kroeger and published by . This book was released on 1997 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissolved Oxygen and Its Influence in the Self purification of Streams written by Edward Murray East and published by . This book was released on 1901 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Arctic Climate Impact Assessment Scientific Report written by Arctic Climate Impact Assessment and published by Cambridge University Press. This book was released on 2005-11-07 with total page 1053 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arctic is now experiencing some of the most rapid and severe climate change on earth. Over the next 100 years, climate change is expected to accelerate, contributing to major physical, ecological, social, and economic changes, many of which have already begun. Changes in arctic climate will also affect the rest of the world through increased global warming and rising sea levels. Arctic Climate Impact Assessment was prepared by an international team of over 300 scientists, experts, and knowledgeable members of indigenous communities. The report has been thoroughly researched, is fully referenced, and provides the first comprehensive evaluation of arctic climate change, changes in ultraviolet radiation and their impacts for the region and for the world. It is illustrated in full color throughout. The results provided the scientific foundations for the ACIA synthesis report - Impacts of a Warming Arctic - published by Cambridge University Press in 2004.
Download or read book Wetland Ecosystems written by William J. Mitsch and published by John Wiley & Sons. This book was released on 2009-04-13 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: New focused text introduces readers to wetland ecosystems and systems approaches to studying wetlands With its comprehensive coverage of wetland science, management, and restoration, Mitsch and Gosselink's Wetlands has been the premier reference on wetlands for more than two decades. Now, the coverage of specific wetland ecosystem types from earlier editions of this acclaimed work has been updated, revised, and supplemented with additional content in order to create this new text focusing exclusively on wetland ecosystems. This book now complements Wetlands, Fourth Edition. Following an introduction to ecosystems in general and wetland ecosystems in particular, Wetland Ecosystems examines the major types of wetlands found throughout the world: coastal wetlands, freshwater marshes and forested swamps, and peatlands. The final chapter reviews three fundamental systems approaches to studying wetlands: mesocosms, full-scale experimental ecosystems, and mathematical modeling. This new text features: Updated descriptions of the hydrology, biogeochemistry, and biology of the main types of wetlands found in the world New content introducing general ecosystems, wetland ecosystems, whole ecosystem and mesocosm experiments with wetlands, and systems ecology and modeling A detailed description of the ecosystem services provided by wetlands A broad international scope, including many examples of wetlands located outside North America Two new coauthors offering new perspectives and additional insights into the latest ecosystem and modeling techniques An abundance of illustrations helps readers understand how different biological communities and the abiotic environment in wetland ecosystems interact and function. Tables and text boxes provide at-a-glance summaries of key information. Lastly, each chapter concludes with a list of recommended readings. This text has been designed as an introduction for students and professionals in wetland ecology and management, general ecology, environmental science, and natural resource management.
Download or read book Second Assessment of Climate Change for the Baltic Sea Basin written by The BACC II Author Team and published by Springer. This book was released on 2015-04-03 with total page 515 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an update of the first BACC assessment, published in 2008. It offers new and updated scientific findings in regional climate research for the Baltic Sea basin. These include climate changes since the last glaciation (approx. 12,000 years ago), changes in the recent past (the last 200 years), climate projections up until 2100 using state-of-the-art regional climate models and an assessment of climate-change impacts on terrestrial, freshwater and marine ecosystems. There are dedicated new chapters on sea-level rise, coastal erosion and impacts on urban areas. A new set of chapters deals with possible causes of regional climate change along with the global effects of increased greenhouse gas concentrations, namely atmospheric aerosols and land-cover change. The evidence collected and presented in this book shows that the regional climate has already started to change and this is expected to continue. Projections of potential future climates show that the region will probably become considerably warmer and wetter in some parts, but dryer in others. Terrestrial and aquatic ecosystems have already shown adjustments to increased temperatures and are expected to undergo further changes in the near future. The BACC II Author Team consists of 141 scientists from 12 countries, covering various disciplines related to climate research and related impacts. BACC II is a project of the Baltic Earth research network and contributes to the World Climate Research Programme.
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1990 with total page 1180 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 1990 with total page 1180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book SIPRE Report written by and published by . This book was released on with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Global Warming written by John T. Houghton and published by Cambridge University Press. This book was released on 1997-09-18 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: The best briefing on global warming the student or interested general reader could wish for.
Download or read book Water Stress in Plants written by Ismail M. M. Rahman and published by BoD – Books on Demand. This book was released on 2016-08-24 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water stress in plants is caused by the water deficit, as induced possibly by drought or high soil salinity. The prime consequence of water stress in plants is the disruption in the agricultural production, resulting in food shortage. The plants, however, try to adapt to the stress conditions using biochemical and physiological interventions. The edited compilation is an attempt to provide new insights into the mechanism and adaptation aspects of water stress in plants through a thoughtful mixture of viewpoints. We hope that the content of the book will be useful for the researchers working with the plant diversity-related environmental aspects and also provide suggestions for the strategists.
Download or read book An Index to the First Twenty Volumes of the Proceedings and the First Twenty one Communications 1922 1978 written by International Association of Theoretical and Applied Limnology and published by Balogh Scientific Books. This book was released on 1981 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lipids in Aquatic Ecosystems written by Michael T. Arts and published by Springer Science & Business Media. This book was released on 2009-06-12 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evidence now suggests that the roles of essential fatty acids as growth promoters and as indices of health and nutrition are fundamentally similar in freshwater and marine ecosystems. Lipids in Aquatic Ecosystems integrates this divergent literature into a coordinated, digestible form. Chapters are organized so as to discuss and synthesize the flow of lipids from lower to higher trophic levels, up to and including humans. Linkages between the production, distribution and pathways of these essential compounds within the various levels of the aquatic food webs, and their ultimate uptake by humans and other terrestrial organisms, are highlighted throughout the book. This book will be of interest to researchers and resource managers working with aquatic ecosystems.
Download or read book Performance of aerated lagoons in northern climates written by Conrad Christianson and published by . This book was released on 1979 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guide to Best Practices for Ocean Acidification Research and Data Reporting written by and published by . This book was released on 2011 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
