Download or read book Fluxes of Dissolved Organic Carbon During Storm Events in the Neponset River Watershed written by Keith Thomas Cialino and published by . This book was released on 2015 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissolved Organic Carbon and Nitrogen Dynamics in a Pristine Old Growth Forested Watershed with Anthropogenic Nitrogen Deposition written by Christopher Amyot and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Forested watersheds play an important role in the transformation of nitrogen (N) and carbon (C) as they pass from atmospheric inputs to aquatic ecosystems, under diverse anthropogenic nitrogen deposition and land cover regimes. In this study, I examined the transformations of dissolved organic carbon (DOC), ammonium (NH4), nitrate (NO3), and dissolved organic nitrogen (DON) from precipitation inputs through the forest canopy, into the well-drained and wetland soils, and into two streams draining a 46 ha and a 11 ha nested old growth forested watersheds at Mont St. Hilaire (MSH), in southern Quebec. Measurements were made from May to September 2013, with sampling at one-week intervals and during storm events. Concentrations and fluxes of DOC, NH4, and DON increased from the atmosphere to throughfall, and decreased as water passed through the upland mineral soils and wetlands to the stream, while NO3 showed no change. Transformations of DON occurred as water passed through persistently saturated areas within the wetland and surrounding the stream, resulting in biogeochemical hotspots, where DON concentrations significantly decreased. DOC did not respond these locations, yet is positively correlated to DON and increased water depth. Yearly estimated inputs through the forest canopy were 4.04 kg/ha/yr, 5.61 kg/ha/yr, 3.14 kg/ha/yr, and 79.41 kg/ha/yr for NO3, NH4, DON and DOC. Overall, N retention rates from atmospheric input to stream output were 90 % and 91 % for DON and for a combined NO3 and NH4 input-output measure, while DOC inputs were five times greater than outputs. NO3 was retained less during saturated soils conditions and DON showed slightly more retention at the beginning of the growing season. When compared to other studies with low nitrogen, MSH, showed no similarities in retention or output. Studies with high nitrogen deposition and past disturbance did compare with NO3 and NH4 retention results for MSH, however, hydrological DOC inputs-outputs, at MSH, when compared to other high nitrogen sites with anthropogenic disturbance differed, showing five times more DOC input than output, compared to two times more output than input for the disturbed sites. These findings help to define the present day N and C dynamics in an old growth forest with anthropogenic nitrogen deposition, and provide a comparison for future environmental changes and to conservation and natural resource managers during the restoration and protection of forested watersheds. " --
Download or read book Ephemeral Organic Carbon Fluxes to the Chesapeake Bay from Agricultural Runoff on the Virginia Coastal Plain written by Emma Katherine Caverly and published by . This book was released on 2012 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dissolved organic carbon (DOC) and particulate organic carbon (POC) play a critical role in nutrient cycling, contaminant transport and the global carbon cycle, but total organic carbon (TOC) fluxes are not well constrained across different land uses and environments. We use automated high resolution sampling of agricultural storm runoff and stream height to quantify DOC and POC fluxes and dynamics in an ephemeral channel on the coastal plain of Virginia. DOC and POC were characterized using specific UV absorbance (SUVA254). During a two week period when a hurricane and tropical storm passed over the region, we measured a DOC flux of 22 kg ha-1 and a POC flux of 11.3 kg ha-1. SUVA254 values indicated that the aromatic portion of DOC ranged from a minimum 18.6% at the beginning of the first event to a maximum of 44.0% during the second event; this represents an increase in soil derived DOC. Hysteresis plots and SUVA254 indicated that plant derived aliphatic DOC was depleted while soil sourced aromatic DOC was readily available. Ephemeral can facilitate the export of large quantities of organic carbon during flashy, storm generated flows.
Download or read book Dissolved Organic Carbon Dynamics During the Snowmelt Period in a Small Urban Watershed written by Jaclyn L. O'Riley and published by . This book was released on 2012 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Changes in Fluxes of Dissolved Organic Carbon DOC from Small Catchments in Central Scotland written by Catherine Louise Wearing and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Concentrations of dissolved organic carbon (DOC) measured within water bodies have been increasing on a global scale over the last two decades. Changes in temperature and rainfall have been shown to increase the production and export of DOC from catchments with peat soils in the UK (Freeman et al., 2001). However it is not clear whether increases in DOC concentrations are caused by production increases induced by temperature changes or by a greater incidence of high flows induced by rainfall changes. Increases in both temperature and rainfall have been predicted in Scotland over the next few decades (Kerr et al., 1999) which may further increase current DOC concentrations and exports. The implications of this include both a decrease in water quality and an increase in mobility of metals in upland water bodies. The overall aim of the thesis is to determine if the relationship between dissolved organic carbon (DOC) concentrations and discharge has changed over a 20 year period in small stream catchments in Scotland, in order to better understand the role of hydrology, in driving changes in DOC concentration. To achieve this streams draining two coniferous forest sites and one moorland site were monitored intensively between June 2004 and February 2006. Analysis of the relationship between DOC and discharge, within the catchments, identified the importance of the amount of precipitation falling on the catchment, antecedent precipitation and season, on the concentration of DOC that was measured within the stream. Models were then developed using variables to represent these drivers in terms of both the production (seasonal sine values and 14 day average temperatures) and movement (log of discharge (log Q), days since previous storm event and rising or falling stage) of DOC. In the Ochil Hills catchment, the best predictive model, used 4 hour average discharge and 1 day average 30cm soil temperatures (R2= 0.88). In the Duchray and Elrig catchments, the best predictive models produced used discharge and seasonal sine values; the strength of the model was greater in the Elrig (R2= 0.80) than the Duchray (R2= 0.48) catchment. The strength of the regression models produced highlighted the importance of precipitation in the movement of DOC to the stream and temperature variables representing production in the surrounding catchment. To determine if dissolved organic carbon (DOC) concentrations had changed within the three study catchments, since previous research was conducted at the same sites in the early 1980s and 1990s (Grieve, 1984a; Grieve, 1994), then regression analysis conducted in the previous research was repeated, so changes in the DOC and discharge relationship could be identified. Analysis of the Ochil Hills regression equations identified higher log of discharge and lower temperature and seasonal sine values in the present study (2004-06), when compared to the previous study (1982-83). This suggests that more DOC is now available for movement from the soil, and that the difference between winter and summer DOC production has decreased, potentially because of increasing temperatures. This would explain the limited increase in DOC concentration within the Ochil Hills stream. In the Duchray and Elrig streams, a large increase in DOC was identified at all discharges when all the models produced were compared between the two sampling periods (1989-90 and 2004-06). The increasing trend in DOC concentrations is too large to have been produced by change in temperature alone and it is suggested that the measured reduction in acidic deposition has resulted in the increased DOC concentrations measured in the Duchray and Elrig. The results from this research have identified that concentrations of DOC have increased in Scottish streams over the last 20 years and that the increases in DOC have been induced, potentially by temperature changes in climate. However, changes in temperature are not the only driver of this change as the reduction in acidic deposition is potentially more important, specifically in areas with base poor geology such as the Duchray and Elrig catchments.
Download or read book Fluxes of Dissolved Organic Matter from Urban Catchments in the Neuse River Basin written by Sarah Ellen Johnston and published by . This book was released on 2015 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Organic Matter Fluorescence written by Paula G. Coble and published by Cambridge University Press. This book was released on 2014-07-14 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: A core text on principles, laboratory/field methodologies, and data interpretation for fluorescence applications in aquatic science, for advanced students and researchers.
Download or read book Aquatic Ecosystems Interactivity of Dissolved Organic Matter written by Stuart Findlay and published by Academic Press. This book was released on 2003 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: Overviews of the source, supply and variability of DOM, surveys of the processes that mediate inputs to microbial food webs, and syntheses consolidating research findings provide a comprehensive review of what is known of DOM in freshwater. This book will be important to anyone interested in understanding the fundamental factors associated with DOM that control aquatic ecosystems."--BOOK JACKET.
Download or read book Geotitles written by and published by . This book was released on 1991 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Twentieth Century Building Materials written by Thomas C. Jester and published by Getty Publications. This book was released on 2014-08-01 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the concluding decades of the twentieth century, the historic preservation community increasingly turned its attention to modern buildings, including bungalows from the 1930s, gas stations and diners from the 1940s, and office buildings and architectural homes from the 1950s. Conservation efforts, however, were often hampered by a lack of technical information about the products used in these structures, and to fill this gap Twentieth-Century Building Materials was developed by the U.S. Department of the Interior’s National Park Service and first published in 1995. Now, this invaluable guide is being reissued—with a new preface by the book’s original editor. With more than 250 illustrations, including a full-color photographic essay, the volume remains an indispensable reference on the history and conservation of modern building materials. Thirty-seven essays written by leading experts offer insights into the history, manufacturing processes, and uses of a wide range of materials, including glass block, aluminum, plywood, linoleum, and gypsum board. Readers will also learn about how these materials perform over time and discover valuable conservation and repair techniques. Bibliographies and sources for further research complete the volume. The book is intended for a wide range of conservation professionals including architects, engineers, conservators, and material scientists engaged in the conservation of modern buildings, as well as scholars in related disciplines.
Download or read book Making the Geologic Now written by Elizabeth Ellsworth and published by . This book was released on 2012-12-01 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Making the Geologic Now announces shifts in cultural sensibilities and practices. It offers early sightings of an increasingly widespread turn toward the geologic as source of explanation, motivation, and inspiration for creative responses to conditions of the present moment. In the spirit of a broadside, this edited collection circulates images and short essays from over 40 artists, designers, architects, scholars, and journalists who are actively exploring and creatively responding to the geologic depth of "now." Contributors' ideas and works are drawn from architecture, design, contemporary philosophy and art. They are offered as test sites for what might become thinkable or possible if humans were to collectively take up the geologic as our instructive co-designer-as a partner in designing thoughts, objects, systems, and experiences. A new cultural sensibility is emerging. As we struggle to understand and meet new material realities of earth and life on earth, it becomes increasingly obvious that the geologic is not just about rocks. We now cohabit with the geologic in unprecedented ways, in teeming assemblages of exchange and interaction among geologic materials and forces and the bio, cosmo, socio, political, legal, economic, strategic, and imaginary. As a reading and viewing experience, Making the Geologic Now is designed to move through culture, sounding an alert from the unfolding edge of the "geologic turn" that is now propagating through contemporary ideas and practices. Contributors include: Matt Baker, Jarrod Beck, Stephen Becker, Brooke Belisle, Jane Bennett, David Benque, Canary Project (Susannah Sayler, Edward Morris), Center for Land Use Interpretation, Brian Davis, Seth Denizen, Anthony Easton, Elizabeth Ellsworth, Valeria Federighi, William L. Fox, David Gersten, Bill Gilbert, Oliver Goodhall, John Gordon, Ilana Halperin, Lisa Hirmer, Rob Holmes, Katie Holten, Jane Hutton, Julia Kagan, Wade Kavanaugh, Oliver Kellhammer, Elizabeth Kolbert, Janike Kampevold Larsen, Jamie Kruse, William Lamson, Tim Maly, Geoff Manaugh, Don McKay, Rachel McRae, Brett Milligan, Christian MilNeil, Laura Moriarity, Stephen Nguyen, Erika Osborne, Trevor Paglen, Anne Reeve, Chris Rose, Victoria Sambunaris, Paul Lloyd Sargent, Antonio Stoppani, Rachel Sussman, Shimpei Takeda, Chris Taylor, Ryan Thompson, Etienne Turpin, Nicola Twilley, Bryan M. Wilson.
Download or read book Municipal Wastewater Treatment written by Andrew Stoddard and published by John Wiley & Sons. This book was released on 2003-03-20 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: A thorough analysis of public policy and the Clean Water Act'seffect on water quality in the U.S. Using water quality data and historical records from the past 60years, this book presents the measured impact of the 1972 CleanWater Act on domestic waterways-ecologically, politically, andeconomically. Municipal Wastewater Treatment supports thehypothesis that the Act's regulation of wastewater treatmentprocesses at publicly owned treatment works (POTW) and industrialfacilities has achieved significant success. The authors' case ispresented in: * Background information on the history of water pollution controland water quality management * Chapters addressing long-term trends in biochemical oxygen demandloadings from municipal wastewater plants and the "worst-case"dissolved oxygen levels in waterways downstream of point sourcesbefore and after the Clean Water Act * Nine case study assessments of long-term trends of pollutantloading water quality and environmental resources associated withPOTW discharges Using long-term trends in dissolved oxygen as the key indicator ofwater quality improvements, this book provides a detailedretrospective analysis of the effectiveness of the water pollutioncontrol policies and regulations of the 1972 Clean Water Act. Thesuccesses of the Act that have been achieved over the past 30 yearsare placed in the historical context of the "Great SanitaryAwakening" of the 19th century and changes in public policies forwater supply and water pollution control that have evolved duringthe 20th century to protect public health and the intrinsic valueof aquatic resources. Case study sites include the ConnecticutRiver, Hudson-Raritan Estuary, Delaware Estuary, Potomac Estuary,Upper Chattahoochee River, Ohio River, Upper Mississippi River, andWillamette River. Complete with end-of-chapter summaries and conclusions, MunicipalWastewater Treatment: Evaluating Improvements in National WaterQuality is an essential book for engineers, scientists, regulators,and consultants involved in water quality management and wastewatertreatment, as well as students of environmental engineering,environmental science, and public policy.
Download or read book Chesapeake Bay Study written by United States. Army. Corps of Engineers. Baltimore District and published by . This book was released on 1978 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book One Hundred Years of American Commerce 1795 1895 written by Chauncey M. Depew and published by . This book was released on 1895 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book HEC 6 written by and published by . This book was released on 1995 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inventory of Shared Water Resources in Western Asia written by United Nations. Economic and Social Commission for Western Asia and published by UN. This book was released on 2013 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foreword -- Preface -- Acronyms & units of measurement -- Introduction to the inventory -- Shared water resources in Western Asia -- Key findings -- Overview & methodology: Surface water -- Euphrates River Basin -- Shared tributaries of the Euphrates River -- Tigris River Basin -- Shared tributaries of the Tigris River -- Shatt al Arab, Karkheh and Karun Rivers -- Jordan River Basin -- Orontes River Basin -- Nahr El Kabir Basin -- Qweik River Basin -- Overview & methodology: Groundwater -- Saq-Ram Aquifer System (West) -- Wajid Aquifer System -- Tawila-Mahra/Cretaceous Sands: Wasia-Biyadh-Aruma Aquifer System (South) -- Sakaka-Rutba: Wasia-Biyadh-Aruma Aquifer System (North) -- Rub'al Khali: Umm er Radhuma-Dammam Aquifer System (South) -- Gulf Umm er Radhuma-Dammam Aquifer System (Centre) -- Widyan-Salman: Umm er Radhuma-Dammam Aquifer System (North) -- Wadi Sirhan Basin: Tawil-Quaternary Aquifer System -- Anti-Lebanon -- Western Aquifer Basin -- Coastal Aquifer Basin -- Yarmouk Basin: Basalt Aquifer System (West) -- Azraq-Dhuleil Basin: Basalt Aquifer System (South) -- Taurus-Zagros -- Jezira Tertiary Limestone Aquifer System -- Jezira Basin: Neogene Aquifer System (North-West): Upper and Lower Fars -- Dibdibba Delta Basin Neogene Aquifer System (South-East): Dibdibba-Kuwait Group
Download or read book Environmental Chemistry of Explosives and Propellant Compounds in Soils and Marine Systems written by Mark Chappell and published by OUP USA. This book was released on 2012-07-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the latest knowledge regarding the environmental chemistry and fate of explosive and propellant compounds
