Download or read book Nitrate nitrate Flux and Potential Removal in the Missippi Atchafalaya River Basin Using Constructed Wetlands and Riparian Buffer Zones written by Justin Victor Remais and published by . This book was released on 2002 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nitrate Removal from Water at the Water mud Interface in Wetlands written by William H. Patrick and published by . This book was released on 1976 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Residence Time on Net Nitrate Retention in Flow regulated Backwaters of the Upper Mississippi River written by William F. James and published by . This book was released on 2006 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nitrogen Removal and the Fate of Nitrate in Riparian Buffer Zones written by Fleur Elizabeth Matheson and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biogeochemical Dynamics at Major River Coastal Interfaces written by Thomas Bianchi and published by Cambridge University Press. This book was released on 2014 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive, state-of-the-art synthesis of biogeochemical dynamics and the impact of human alterations at major river-coastal interfaces for advanced students and researchers.
Download or read book Nitrate in the Mississippi River and Its Tributaries 1980 2010 written by Jennifer Murphy and published by CreateSpace. This book was released on 2014-07-16 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrate concentration and flux were estimated from 1980 through 2010 at eight sites in the Mississippi River Basin as part of the National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey (USGS). These estimates extend the results from a previous investigation that provided nitrate estimates from 1980 through 2008 at the same sites. From 1980 through 2010, annual flow-normalized (FN) nitrate concentration and flux in the Iowa and Illinois Rivers decreased by 11 to 15 percent. These two rivers had the high- est FN nitrate concentration in 1980 (5.3 milligrams per liter [mg/L] and 3.9 mg/L, respectively) of any of the study sites.
Download or read book Nitrate Transport in Shallow Flow Systems at the Neuse River Waste Water Treatment Plant written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years a number of studies have indicated that riparian buffers have a high efficiency of nitrogen removal from shallow groundwater flow systems. However, little work has focused on establishing what relative effect field drainage streams may have on allowing contaminated water to bypass these riparian buffer systems. Even less attention has been focused on how storm event hydrology may affect these systems in terms of nitrate flux. Three groundwater monitoring well transects were installed in a riparian buffer and a weir flow control structure was installed on a surface drainage bordering a waste application field at the Neuse River Waste Water Treatment Plant. This application field has been in use for over 20 years. Well water and surface water were sampled for a year beginning in February 2005. Samples were analyzed for nitrate, chloride, silicate, ammonium, and phosphate concentrations as well as natural abundance nitrate-nitrogen, nitrate-oxygen, water-oxygen, and water-hydrogen stable isotope ratios. Water quality measurements were made through the transition from dormant to growing season and from high to low water table gradients and elevations. The summer and fall of 2005 were a time of extreme drought in the region and allowed examination of low flow conditions and system recovery to normal flow patterns. The buffer groundwater ion concentrations and nitrogen isotope compositions remained extremely consistent throughout the different conditions. Nitrate concentration 10 m inside the buffer averaged 33.7 mgN/L and 20 m farther into the buffer at wells 6 m from the river edge averaged 0.30 mgN/L, for a nitrate reduction of 99.1% after factoring in rainwater dilution (approximately 34.8%) calculated from chloride data. This study indicates that even shallow groundwater systems at 3-5m of depth can experience high efficient nitrogen removal by denitrification in riparian buffer zones. The surface drainage system transitioned from low flow rates and n.
Download or read book Nitrate Movement and Removal in Riparian Buffer Areas written by Lin Xu and published by . This book was released on 1992 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Quality of the Albemarle Pamlico Drainage Basin North Carolina and Virginia 1992 95 written by and published by . This book was released on 1984 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nitrate Removal from a Synthetic Groundwater Using a Constructed Wetland written by Jennifer Rock and published by . This book was released on 1993 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nutrient Criteria Technical Guidance Manual written by and published by . This book was released on 2000 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mississippi River Water Quality and the Clean Water Act written by National Research Council and published by National Academies Press. This book was released on 2008-02-08 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mississippi River is, in many ways, the nation's best known and most important river system. Mississippi River water quality is of paramount importance for sustaining the many uses of the river including drinking water, recreational and commercial activities, and support for the river's ecosystems and the environmental goods and services they provide. The Clean Water Act, passed by Congress in 1972, is the cornerstone of surface water quality protection in the United States, employing regulatory and nonregulatory measures designed to reduce direct pollutant discharges into waterways. The Clean Water Act has reduced much pollution in the Mississippi River from "point sources" such as industries and water treatment plants, but problems stemming from urban runoff, agriculture, and other "non-point sources" have proven more difficult to address. This book concludes that too little coordination among the 10 states along the river has left the Mississippi River an "orphan" from a water quality monitoring and assessment perspective. Stronger leadership from the U.S. Environmental Protection Agency (EPA) is needed to address these problems. Specifically, the EPA should establish a water quality data-sharing system for the length of the river, and work with the states to establish and achieve water quality standards. The Mississippi River corridor states also should be more proactive and cooperative in their water quality programs. For this effort, the EPA and the Mississippi River states should draw upon the lengthy experience of federal-interstate cooperation in managing water quality in the Chesapeake Bay.
Download or read book Reducing Nitrate Pollution by Redirecting Farm Runoff Into the Subsurface of an Herbaceous Riparian Buffer Zone written by Tamru G. Taye and published by . This book was released on 2016 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: In areas dominated by agricultural land use, excess nitrate is one of the leading contributors to water pollution. Tile drains, installed to drain crop root zones for maximum yield, fast track the introduction of nitrate-laden water into a nearby stream. Due to the risks elevated levels of nitrate pose to an ecosystem and its inhabitants, the following project explores a method of reducing nitrate pollution. One that can do it as close to the source of the pollution as possible. A tile draining a 60acre farm in central Illinois was redirected to discharge its contents through subsurface flow into an herbaceous riparian buffer zone (RBZ) located immediately below the farm. A transect of nested observation wells were installed across the riparian buffer intersecting the redirected subsurface tiles. A study on the groundwater and soils was performed to determine the ability the RBZ has for nitrate reduction/removal. Prior to redirecting tile water into the RBZ, chemical analysis of the RBZ water showed low concentrations of NO3---N (& le;5mg/L). The conditions necessary for the reduction/removal of nitrate, such as low levels of dissolved oxygen, dissolved organic carbon, and organic matter in the soils, and groundwater temperature were also investigated. A statistical comparison of the concentration of NO3---N at the wells (effluent) vs the diversion box (influent) shows that the waters are significantly different (p
Download or read book Nitrous Oxide Emission from Riparian Buffers in Agricultural Landscapes of Indiana written by Katelin Rose Fisher and published by . This book was released on 2013 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Riparian buffers have well documented capacity to remove nitrate (NO3-) from runoff and subsurface flow paths, but information on field-scale N2O emission from these buffers is lacking. This study monitored N2O fluxes at two agricultural riparian buffers in the White River watershed (Indiana) from December 2009 to May 2011 to assess the impact of landscape and hydrogeomorphologic factors on emission. Soil chemical and biochemical properties were measured and environmental variables (soil temperature and moisture) were monitored in an attempt to identify key drivers of N2O emission. The study sites included a mature riparian forest (WR) and a riparian grass buffer (LWD); adjacent corn fields were also monitored for land-use comparison. With the exception of net N mineralization, most soil properties (particle size, bulk density, pH, denitrification potential, organic carbon, C:N) showed little correlation with N2O emission. Analysis of variance (ANOVA) identified season, land-use (riparian buffer vs. crop field), and site geomorphology as major drivers of N2O emission. At both study sites, N2O emission showed strong seasonal variability; the largest emission peaks in the riparian buffers (up to 1,300 % increase) and crop fields (up to 3,500 % increase) occurred in late spring/early summer as a result of flooding, elevated soil moisture and N-fertilization. Nitrous oxide emission was found to be significantly higher in crop fields than in riparian buffers at both LWD (mean: 1.72 and 0.18 mg N2O-N m-2 d-1) and WR (mean: 0.72 and 1.26 mg N2O-N m-2 d-1, respectively). Significant difference (p=0.02) in N2O emission between the riparian buffers was detected, and this effect was attributed to site geomorphology and the greater potential for flooding at the WR site (no flooding occurred at LWD). More than previously expected, the study results demonstrate that N2O emission in riparian buffers is largely driven by landscape geomorphology and land-stream connection (flood potential).
Download or read book Flux and Sources of Nutrients in the Mississippi Atchafalaya River Basin written by and published by . This book was released on 1999 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wetlands written by Committee on Characterization of Wetlands and published by National Academies Press. This book was released on 1995-09-20 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Wetlands" has become a hot word in the current environmental debate. But what does it signify? In 1991, proposed changes in the legal definities of wetlands stirred controversy and focused attention on the scientific and economic aspects of their management. This volume explores how to define wetlands. The committee--whose members were drawn from academia, government, business, and the environmental community--builds a rational, scientific basis for delineating wetlands in the landscape and offers recommendations for further action. Wetlands also discusses the diverse hydrological and ecological functions of wetlands, and makes recommendations concerning so-called controversial areas such as permafrost wetlands, riparian ecosystems, irregularly flooded sites, and agricultural wetlands. It presents criteria for identifying wetlands and explores the problems of applying those criteria when there are seasonal changes in water levels. This comprehensive and practical volume will be of interest to environmental scientists and advocates, hydrologists, policymakers, regulators, faculty, researchers, and students of environmental studies.
Download or read book Integrated Assessment of Hypoxia in the Northern Gulf of Mexico written by and published by . This book was released on 2000 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
