Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Use Of Stable Isotopes Of Carbon And Nitrogen To Identify Sources Of Organic Matter To Bed Sediments Of The Tualatin River Oregon
Download Use Of Stable Isotopes Of Carbon And Nitrogen To Identify Sources Of Organic Matter To Bed Sediments Of The Tualatin River Oregon full books in PDF, epub, and Kindle. Read online Use Of Stable Isotopes Of Carbon And Nitrogen To Identify Sources Of Organic Matter To Bed Sediments Of The Tualatin River Oregon ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Use of Stable Isotopes of Carbon and Nitrogen to Identify Sources of Organic Matter to Bed Sediments of the Tualatin River, Oregon by : Bernadine Bonn
Download or read book Use of Stable Isotopes of Carbon and Nitrogen to Identify Sources of Organic Matter to Bed Sediments of the Tualatin River, Oregon written by Bernadine Bonn and published by . This book was released on 2010 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: The potential sources of organic matter to bed sediment of the Tualatin River in northwestern Oregon were investigated by comparing the isotopic fractionation of carbon and nitrogen and the carbon/nitrogen ratios of potential sources and bed sediments. Samples of bed sediment, suspended sediment, and seston, as well as potential source materials, such as soil, plant litter, duckweed, and wastewater treatment facility effluent particulate were collected in 1998-2000. Based on the isotopic data, terrestrial plants and soils were determined to be the most likely sources of organic material to Tualatin River bed sediments. The [delta]13C fractionation matched well, and although the [delta]15N and carbon/nitrogen ratio of fresh plant litter did not match those of bed sediments, the changes expected with decomposition would result in a good match. The fact that the isotopic composition of decomposed terrestrial plant material closely resembled that of soils and bed sediments supports this conclusion. Phytoplankton probably was not a major source of organic matter to bed sediments. Compared to the values for bed sediments, the [delta]13C values and carbon/nitrogen ratios of phytoplankton were too low and the [delta]15N values were too high. Decomposition would only exacerbate these differences. Although phytoplankton cannot be considered a major source of organic material to bed sediment, a few bed sediment samples in the lower reach of the river showed a small influence from phytoplankton as evidenced by lower [delta]13C values than in other bed sediment samples. Isotopic data and carbon/nitrogen ratios for bed sediments generally were similar throughout the basin, supporting the idea of a widespread source such as terrestrial material. The [delta]15N was slightly lower in tributaries and in the upper reaches of the river. Higher rates of sediment oxygen demand have been measured in the tributaries in previous studies and coupled with the isotopic data may indicate the presence of more labile organic matter in these areas. Results from this study indicate that strategies to improve oxygen conditions in the Tualatin River are likely to be more successful if they target sources of soil, leaf litter, and other terrestrially derived organic materials to the river rather than the instream growth of algae.
Book Synopsis Application of Nitrogen Stable Isotopes to Identify Sources of Nutrient Pollution by : Elizabeth A. Redon
Download or read book Application of Nitrogen Stable Isotopes to Identify Sources of Nutrient Pollution written by Elizabeth A. Redon and published by . This book was released on 2001 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nutrient pollution may perhaps be one of the oldest water quality problems and has recently been considered as one of the greatest threats to estuarine and coastal waters. Excessive nutrient loads have had a vast array of impacts on estuarine and coastal ecosystems globally. Direct negative effects include: shading out of benthic plant communities, hypoxia and anoxia due to increased biological oxygen demand, compositional change in plant and fauna! community structure and increased occurrences of harmful algal blooms. This has lead to decreased biodiversity, habitat, fisheries, tourism and aesthetics. So far environmental managers have had to rely on a posteriori assessments of the status of nutrient pollution, using indicators such as taxonomic shifts and changes in biological abundance, which have already occurred. By the time nutrient pollution is detected, restoration of habitats is costly and sometimes no longer an option. Therefore, there is a need for management tools to assess sources of nutrient loads before damage to estuarine and coastal ecosystems progresses beyond recovery. Early work using stable isotopes of dissolved inorganic nitrogen in groundwater samples demonstrated the potential for using stable isotopes to identify anthropogenic sources of nitrogen. These studies revealed that nitrogen sources such as fertilizers, soil organic nitrogen and wastewater nitrogen have isotopically distinct signatures that could be used to assess anthropogenic nitrogen contributions. Therefore, application of nitrogen stable isotope methods could potentially provide information on the anthropogenic nitrogen sources stimulating nutrient pollution in estuarine and coastal waters. However, when I assessed this approach for application, two sources of errors became apparent. First, laboratory isolation of dissolved inorganic nitrate from seawater delivered results depleted in 15N relative to the standard used to assess the method. Second, isotopic fractionation associated with nitrogen cycle processes complicates usage of an isotopic mass balance to solve for the nitrogen source and its fractional contribution based on isotopic data alone. As a result, isotopic analysis alone of dissolved inorganic nitrogen to determine anthropogenic sources of nutrient loads to estuarine and coastal waters is not a practical approach to obtain management information concerning nutrient pollution.
Author :Brunswick Technical Meeting on the Use of Isotopes in Soil Organic Matter Studies Publisher : ISBN 13 : Total Pages :505 pages Book Rating :4.:/5 (65 download)
Book Synopsis The use of isotopes in soil organic matter studies by : Brunswick Technical Meeting on the Use of Isotopes in Soil Organic Matter Studies
Download or read book The use of isotopes in soil organic matter studies written by Brunswick Technical Meeting on the Use of Isotopes in Soil Organic Matter Studies and published by . This book was released on 1966 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Isotopes and radiation in soil organic matter studies : proceedings of the Symposium on the Use of Isotopes and Radiation in Soil Organic Matter Studies, held in Vienna, 15 - 19 July, 1968 by :
Download or read book Isotopes and radiation in soil organic matter studies : proceedings of the Symposium on the Use of Isotopes and Radiation in Soil Organic Matter Studies, held in Vienna, 15 - 19 July, 1968 written by and published by . This book was released on 1968 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environmental Engineering Dictionary and Directory by : Thomas M. Pankratz
Download or read book Environmental Engineering Dictionary and Directory written by Thomas M. Pankratz and published by CRC Press. This book was released on 2000-09-22 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Like most technical disciplines, environmental science and engineering is becoming increasingly specialized. As industry professionals focus on specific environmental subjects they become less familiar with environmental problems and solutions outside their area of expertise. This situation is compounded by the fact that many environmental science
Book Synopsis Contaminants in the Subsurface by : National Research Council
Download or read book Contaminants in the Subsurface written by National Research Council and published by National Academies Press. This book was released on 2005-04-23 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: At hundreds of thousands of commercial, industrial, and military sites across the country, subsurface materials including groundwater are contaminated with chemical waste. The last decade has seen growing interest in using aggressive source remediation technologies to remove contaminants from the subsurface, but there is limited understanding of (1) the effectiveness of these technologies and (2) the overall effect of mass removal on groundwater quality. This report reviews the suite of technologies available for source remediation and their ability to reach a variety of cleanup goals, from meeting regulatory standards for groundwater to reducing costs. The report proposes elements of a protocol for accomplishing source remediation that should enable project managers to decide whether and how to pursue source remediation at their sites.
Book Synopsis Phosphorus in Environmental Technology by : E. Valsami-Jones
Download or read book Phosphorus in Environmental Technology written by E. Valsami-Jones and published by IWA Publishing. This book was released on 2004-05-31 with total page 681 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphorus in Environmental Technology: Principles and Applications, provides a definitive and detailed presentation of state-of-the-art knowledge on the environmental behaviour of phosphorus and its applications to the treatment of waters and soils. Special attention is given to phosphorus removal for recovery technologies, a concept that has emerged over the past 5-6 years. The book features an all-encompassing approach: the fundamental science of phosphorus (chemistry, geochemistry, mineralogy, biology), key aspects of its environmental behaviour and mobility, industrial applications (treatment, removal, recovery) and the principles behind such applications, novel biotechnologies and, importantly, it also addresses socio-economic issues which often influence implementation and the ultimate success of any new technology. A detailed subject index helps the reader to find their way through the different scientific and technological aspects covered, making it an invaluable reference work for students, professionals and consultants dealing with phosphorus-related environmental technologies. State-of-the-art knowledge on the behaviour of phosphorus and its applications to environmental science and technology. Covers all aspects of phosphorus in the environment, engineered and biological systems; an interdisciplinary text.
Book Synopsis Phosphorus Release from Lake Sediments by : Raymond E. Wildung
Download or read book Phosphorus Release from Lake Sediments written by Raymond E. Wildung and published by . This book was released on 1973 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Water-resources Investigations Report by :
Download or read book Water-resources Investigations Report written by and published by . This book was released on 1992 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geological Survey Research, 1975 by : Geological Survey (U.S.)
Download or read book Geological Survey Research, 1975 written by Geological Survey (U.S.) and published by . This book was released on 1975 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nitrogen Fixation by Free-Living Micro-Organisms by : William Duncan Patterson Stewart
Download or read book Nitrogen Fixation by Free-Living Micro-Organisms written by William Duncan Patterson Stewart and published by CUP Archive. This book was released on 1975 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 1976 volume provides information, presented at an international symposium in Edinburgh, on the free-living nitrogen-fixing bacteria and blue-green algae. In addition to information on the distribution of the nitrogenase enzyme within these groups, their role in the soil and in aquatic systems is considered, as are the methods of measuring nitrogen fixation.
Book Synopsis Watershed Assessment of River Stability and Sediment Supply (WARSSS) by : David L. Rosgen
Download or read book Watershed Assessment of River Stability and Sediment Supply (WARSSS) written by David L. Rosgen and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis River Stability by : David L. Rosgen
Download or read book River Stability written by David L. Rosgen and published by . This book was released on 2008-01-01 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Introduction to the Physics of Cohesive Sediment Dynamics in the Marine Environment by : Johan C. Winterwerp
Download or read book Introduction to the Physics of Cohesive Sediment Dynamics in the Marine Environment written by Johan C. Winterwerp and published by Elsevier. This book was released on 2004-08-20 with total page 577 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an introduction to the physical processes of cohesive sediment in the marine environment. It focuses on highly dynamic systems, such as estuaries and coastal seas. Processes on the continental shelf are also discussed and attention is given to the effects of chemistry, biology and gas.The process descriptions are based on hydrodynamic and soil mechanic principles, which integrate at the soil-water interface. This approach is substantiated through a classification scheme of sediment occurrences in which distinction is made between cohesive and granular material. Emphasis is also placed on the important interactions between turbulent flow and cohesive sediment suspensions, and on the impact of flow-induced forces on the stability of the seabed. An overview of literature on cohesive sediment dynamics is presented and a number of new developments are highlighted, in particular in relation to floc formation, settling and sedimentation, consolidation, bed failure and liquefaction and erosion of the bed. Moreover, it presents a summary on methods and techniques to measure the various sediment properties necessary to quantify the various parameters in the physical-mathematical model descriptions. A number of examples and case studies have been included.
Book Synopsis United States Geological Survey by :
Download or read book United States Geological Survey written by and published by . This book was released on 1995 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Is a Powerful Quake Likely to Strike in the Next 30 Years? by : Andrew Jay Michael
Download or read book Is a Powerful Quake Likely to Strike in the Next 30 Years? written by Andrew Jay Michael and published by . This book was released on 2003 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Battle Creek Salmon and Steelhead Restoration Project by :
Download or read book Battle Creek Salmon and Steelhead Restoration Project written by and published by . This book was released on 2005 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
