Download or read book Hydrologic Transport of Mercury Through Forested Watersheds written by Randall Karl Kolka and published by . This book was released on 1996 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mercury Transport Through Northern Forested Watersheds written by Jacob Arnold Fleck and published by . This book was released on 1999 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrology and the Management of Watersheds written by Kenneth N. Brooks and published by John Wiley & Sons. This book was released on 2012-10-01 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition is a major revision of the popular introductory reference on hydrology and watershed management principles, methods, and applications. The book's content and scope have been improved and condensed, with updated chapters on the management of forest, woodland, rangeland, agricultural urban, and mixed land use watersheds. Case studies and examples throughout the book show practical ways to use web sites and the Internet to acquire data, update methods and models, and apply the latest technologies to issues of land and water use and climate variability and change.
Download or read book Hydrological Controls on Mercury Mobility and Transport from a Forested Hillslope During Spring Snowmelt written by Kristine Marie Haynes and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book National Pollution Discharge Elimination System NPDES Permit TN0002968 written by Barry P. Moran and published by . This book was released on 1996 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Peatland Biogeochemistry and Watershed Hydrology at the Marcell Experimental Forest written by Randall Kolka and published by CRC Press. This book was released on 2011-02-22 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Marcell Experimental Forest (MEF) in Minnesota serves as a living laboratory and provides scientists with a fundamental understanding of peatland hydrology, acid rain impacts, nutrient and carbon cycling, trace gas emissions, and controls on mercury transport in boreal watersheds. Its important role in scientific research continues to grow as t
Download or read book Mercury Transport and Fate Through a Watershed written by and published by . This book was released on 2006 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mercury in the Environment written by Michael S. Bank and published by Univ of California Press. This book was released on 2012-05-31 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mercury pollution and contamination are widespread, well documented, and continue to pose a public health concern in both developed and developing countries. In response to a growing need for understanding the cycling of this ubiquitous pollutant, the science of mercury has grown rapidly to include the fields of biogeochemistry, economics, sociology, public health, decision sciences, physics, global change, and mathematics. Only recently have scientists begun to establish a holistic approach to studying mercury pollution that integrates chemistry, biology, and human health sciences. Mercury in the Environment follows the process of mercury cycling through the atmosphere, through terrestrial and aquatic food webs, and through human populations to develop a comprehensive perspective on this important environmental problem. This timely reference also provides recommendations on mercury remediation, risk communication, education, and monitoring.
Download or read book Extended Abstracts Fourth International Conference on the Biogeochemistry of Trace Elements written by and published by . This book was released on 1997 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrological and Biogeochemical Controls on Mercury Fate and Transport in a Southern Ontario Forested Wetland written by Maggie Young and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This study assessed linkages between wetland hydrology, total mercury (HgT) and methylmercury (MeHg) fate and transport in Beverly Swamp, a forested swamp in southern Ontario, Canada. The hydrologically distinct wetland reaches exhibited differences in wetland-stream connectivity. Confined reaches showed little interaction with the wetland during low water levels, but there was hydrological and biogeochemical evidence of increased interaction at high flow. The unconfined reach showed disconnected, effluent flow during periods of high flow, and an influent regime during low flow. HgT flux in both reaches was highest during connected flow. Increased flux of McHg in the confined reaches was found during high flow, high water table connected periods due to decreasing redox and soil flushing. The unconfined reach showed no relationship between McHg and discharge due to periods of flow cessation and localized McHg production in-stream. Overall, the wetland is a sink for HgT and a source for McHg.
Download or read book Handbook of Soil Analysis written by Marc Pansu and published by Springer Science & Business Media. This book was released on 2007-04-18 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is a reference guide for selecting and carrying out numerous methods of soil analysis. It is written in accordance with analytical standards and quality control approaches. It covers a large body of technical information including protocols, tables, formulae, spectrum models, chromatograms and additional analytical diagrams. The approaches are diverse, from the simplest tests to the most sophisticated determination methods.
Download or read book The Role of Small Wetlands and Lakes in Transformation and Transport of Total and Methyl Mercury in the Adirondacks written by Pranesh Selvendiran and published by . This book was released on 2009 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mercury (Hg) is an environmental pollutant that leads to the contamination of forest, soils, lakes and streams. Hg is also a well known neurotoxin and, human and wildlife health concerns are primarily related to exposure to methyl mercury (MeHg) that bioaccumulates in aquatic and terrestrial organisms. Wetlands are important landscapes where ionic Hg (Hg 2+ ) is transformed to MeHg, and transported to downstream aquatic ecosystems. This research was conducted in small forest watershed-lake ecosystems in the Adirondacks to better understand Hg cycling in wetlands and lakes. The study was conducted in three phases. Phase I and II, were designed to investigate Hg transport and fate in two forest wetlands through detailed evaluations of seasonal Hg concentrations and mass budgets. The two wetlands, a riparian peatland and an abandoned beaver meadow, intercept majority of the upland runoff from Archer Creek draining Arbutus Lake Watershed. In Phase III, Hg budgets of two contrasting lakes were evaluated. Arbutus and Sunday lakes differ in landscape, physical and chemical attributes. The proportion of total mercury (THg) that was methyl mercury (% MeHg) in the upland stream of Archer Creek increased from 2% in the upland system to 6% at the outlet of the wetlands. During the growing season concentrations of THg, MeHg and dissolved organic carbon (DOC) were markedly higher and sulfate (SO 4 2- ) was markedly lower compared to the non-growing season. Transport of Hg species was facilitated by DOC production as indicated by significant positive relations with THg and MeHg. Mass balance calculations revealed that the wetlands were net sources of THg and MeHg to stream water, although the magnitude of the source was a function of wetland connectivity to stream water. The storage of THg and MeHg in wetland soil was a large pool which seems coupled with total carbon and sulfur accumulation. In the current scenario of decreasing Hg emission and atmospheric deposition, the large 'active' Hg soil pool in wetlands is a potential short-term and long-term source of Hg and MeHg to downstream aquatic ecosystems. Concentrations of Hg species increased with increases in DOC concentrations and percent wetland coverage at Arbutus (4%) and Sunday Lake (20%). Negligible removal of THg inputs was observed at Sunday Lake that has a short hydraulic residence time (HRT; 0.02 yrs) compared to approximately 60% removal at Arbutus Lake that has longer HRT (0.6 yrs).
Download or read book Mercury and Methylmercury in Reservoirs in Indiana written by Martin R. Risch and published by . This book was released on 2015 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mercury (Hg) is an element that occurs naturally, but evidence suggests that human activities have resulted in increased amounts being released to the atmosphere and land surface. When Hg is converted to methylmercury (MeHg) in aquatic ecosystems, MeHg accumulates and increases in the food web so that some fish contain levels which pose a health risk to humans and wildlife that consume these fish. Reservoirs unlike natural lakes, are a part of river systems that are managed for flood control. Data compiled and interpreted for six flood-control reservoirs in Indiana showed a relation between Hg transport, MeHg formation in water, and MeHg in fish that was influenced by physical, chemical, and biological differences among the reservoirs. Existing information precludes a uniform comparison of Hg and MeHg in all reservoirs in the State, but factors and conditions were identified that can indicate where and when Hg and MeHg levels in reservoirs could be highest. As part of a statewide monitoring network for Hg and MeHg in Indiana streams, 66 water samples were collected from four reservoir tailwater sites (downstream near the dams) on a quarterly schedule for 5 years. The reservoirs were Brookville Lake, Cagles Mill Lake, J. Edward Roush Lake, and Mississinewa Lake. Particulate-bound Hg concentrations were significantly lower in tailwater samples than in samples from free-flowing streams in the statewide network. (Free-flowing streams were not affected by dams and were not upstream from these reservoirs.) These data indicated the reduced flow velocity of water upstream from dams was allowing particulate-bound Hg to settle out of the water in the reservoir pools. The concentration ratios of MeHg to Hg were significantly higher in the tailwater samples than in samples from free-flowing streams, and the MeHg to Hg ratios were significantly higher in summer than in other seasons. To evaluate the conditions related to MeHg formation, pools of three reservoirs (Brookville Lake, Monroe Lake, and Patoka Lake) were investigated during summer hydrologic conditions. Water temperature and dissolved oxygen were measured from the water surface to the lake bottom at 10 to 17 transects across each reservoir to identify three thermal strata, defined by water temperature, dissolved oxygen concentration, and depth. Depth-specific water samples were collected from these thermal strata throughout each reservoir, from the headwaters to the dam and from the tailwater. Mercury concentrations higher than 0.04 nanogram per liter (ng/L) were detected in all 53 samples, and MeHg concentrations higher than 0.04 ng/L were detected in 53 percent of the samples. The investigation found a zone of water below 8 or 9 meters, with temperatures less than 18 degrees Celsius and dissolved oxygen less than 3.5 milligrams per liter, extending through nearly half the reservoir area in Monroe Lake and Patoka Lake. This zone had abundant dissolved MeHg and concentration ratios of dissolved MeHg to Hg that ranged from 25 to 82 percent. This zone also had water with pH less than 7 and decreased dissolved sulfate, conditions indicating sulfate reduction by microorganisms that promoted a high potential for the conversion of Hg to MeHg. Reservoir outflow came from this zone at Monroe Lake and contributed to a tailwater concentration ratio for dissolved MeHg to Hg of 56 percent. Reservoir outflow at Patoka Lake was not from this zone, and dissolved MeHg was not detected in the tailwater. In contrast, samples from the summer pool at Brookville Lake had no MeHg detections even though Hg was detected, probably because the water pH higher than 7 inhibited sulfate reduction and did not promote the conversion of Hg to MeHg. Mercury and MeHg concentrations and the concentration ratios of MeHg to Hg in water varied among the six reservoirs in Indiana, and the differences were related to a combination of factors that could apply to other reservoirs. In areas with moderate to high rates of atmospheric Hg wet and dry deposition, Hg runoff and transport to streams and reservoirs was potentially highest for reservoirs with heavily forested watersheds in steep terrains of near-surface bedrock. Methylmercury concentrations and concentration ratios of MeHg to Hg were highest for reservoirs with the longest summer pools and highest inflow-to-outflow retention times, where water-chemistry conditions favoring sulfate reduction promoted conversion of Hg to MeHg. Methylmercury (reported as Hg) in fish-tissue samples collected for the State fish consumption advisory program was used to describe MeHg food-web accumulation and magnification in the reservoirs. The highest percentages of fish-tissue samples with Hg concentrations that exceeded the criterion of 0.30 milligram per kilogram for protection of human health were from Monroe Lake (38 percent) and Patoka Lake (33 percent). A review of the number and size of fish species caught from these two reservoirs resulted in two implications for fish consumption by humans. First, the highest numbers of fish harvested for potential human consumption were species more likely to have MeHg concentrations lower than the human-health criterion (crappie, bluegill, and catfish). Second, although largemouth bass were likely to have MeHg concentrations higher than the human-health criterion, they were caught and released more often than they were harvested. However, the average size largemouth bass (in both reservoirs) and above-average size walleye (in Monroe Lake) that were harvested for potential human consumption were likely to have MeHg concentrations higher than the human-health criterion.
Download or read book Department of the Interior and Related Agencies Appropriations for 1995 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Department of the Interior and Related Agencies and published by . This book was released on 1994 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transport of Mercury from Soils to Streams in Two Forested Catchments on Mt Mansfield Vermont written by Andrea F. Donlon and published by . This book was released on 1999 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Star Report written by National Center for Environmental Research and Quality Assurance and published by . This book was released on 2000 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Current Perspectives in Contaminant Hydrology and Water Resources Sustainability written by Paul Bradley and published by BoD – Books on Demand. This book was released on 2013-02-27 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Human society depends on liquid freshwater resources to meet drinking, sanitation and hygiene, agriculture, and industry needs. Improved resource monitoring and better understanding of the anthropogenic threats to freshwater environments are critical to efficient management of freshwater resources and ultimately to the survival and quality of life of the global human population. This book helps address the need for improved freshwater resource monitoring and threat assessment by presenting current reviews and case studies focused on the fate and transport of contaminants in the environment and on the sustainability of groundwater and surface-water resources around the world. It is intended for students and professionals working in hydrology and water resources management.
