Download or read book Modeling 250 Years of Phosphorus Loading and Changing Trophic Status in Lake Champlain written by Helen Carr and published by . This book was released on 2011 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paleolimnological records show that since Europeans began settling in the Lake Champlain Basin approximately 250 years ago, the lake has become progressively eutrophic. Eutrophication of freshwater bodies through excess nutrient input has been a major water quality issue worldwide for the past half century (Codd et al., 2005). Certain land use changes, such as the commercialization of agriculture, urbanization, as well as deforestation in the 19th century, may explain some of the observed variability in nutrient and algal biomass accumulation rates in sediments since settlement began. While the underlying causes of productivity rise in Lake Champlain have been inferred from anecdotal evidence, quantitative inferences based on modeled nutrient fluxes are lacking.
Download or read book The trophic status and phosphorus loadings of Lake Champlain written by E B. Henson and published by . This book was released on 1977 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Suitability of Input output Models for Evaluating the Impact of Phosphorus Loadings to Lake Champlain written by John Van Benschoten and published by . This book was released on 1979 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Trophic Status and Phosphorus Loadings of Lake Champlain written by E. B. Henson and published by . This book was released on 1977 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Quality Hydrology and the Effects of Changes in Phosphorus Loading to Pike Lake Washington County Wisconsin with Special Emphasis on Inlet to outlet Short circuiting written by William J. Rose and published by . This book was released on 2004 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Phosphorus Budget Model and Load Reduction Strategy for Lake Champlain written by Vermont. Department of Environmental Conservation and published by . This book was released on 1994 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Onsite Wastewater Treatment Systems Manual written by and published by . This book was released on 2002 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This manual contains overview information on treatment technologies, installation practices, and past performance."--Introduction.
Download or read book Understanding and Mitigating Phosphorus Losses in the Vermont Lake Champlain Basin at the Watershed and Field Scale in a Changing Climate written by George Harrison Myers and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alteration of global nitrogen (N) and phosphorus (P) cycles to support livestock and crop production is the most significant driver of global nutrient surpluses. Losses of excess nutrients to the environment contribute to eutrophication of aquatic systems, leading to harmful algal blooms (HABs), hypoxia, and fish kills. Livestock and dairy production are directly linked to the acceleration of eutrophication via nutrient losses from animal manure. Lake Champlain has been experiencing HABs since the 1970s, and a total maximum daily load (TMDL) is in place to reduce P loading to the lake, with much of the reduction in P load being required to come from the agricultural sector. It is critical to understand nutrient movement and the impact of a changing regional climate in manure-based agricultural watersheds, as dairy farming is the primary agricultural sector in Vermont. Additionally, studying agricultural management practices to mitigate P losses is imperative to meet the target P load reductions set forth by the TMDL. The first portion of this thesis analyzes seasonal differences in nutrient movement in two manure-based agricultural watersheds in the Vermont Lake Champlain Basin (VT LCB) with varying extent of agricultural land use. The results show that the spring and summer had the smallest seasonal loads of total P (TP) and dissolved P (DP) in runoff. The smaller summer P loads appear to be related to periods of drought, while the smaller P loads in the spring are likely related to less manure P built up in the watershed that could be transported to surface waters. Approximately 40% of the cumulative TP load and 43% of the cumulative DP load was discharged from the watersheds in the fall. The increased fall TP and DP loads were likely due to the application of manure across the watersheds during this period. The data suggest that soil erosion is relatively less dominant as a driver of watershed P discharge during times when manure was available for transport post-application (e.g., fall and summer), and more closely linked to watershed P loss during times when less new manure was available (e.g., spring). The results suggest better management of manure application rates and timing as well as increased implementation of agricultural management practices are needed to address increased P transport throughout the year, and especially during the fall. The second portion of this thesis assesses the efficacy of edge-of-field (EOF) iron-based filters for P removal. In-field agricultural management practices such as no-till management and cover cropping target reductions in TP, but do not effectively address DP. EOF filters are a promising management practice for reducing DP losses. Storm runoff at the inlet and outlet of one subsurface and two surface EOF filters was monitored for 10 months. The subsurface filter proved very effective for soluble reactive P (SRP) and TP removal, removing 99% of cumulative SRP load and 91% of TP load from monitored events. The surface filters had varied results, with the east surface filter removing 19% of SRP load and 72% of TP load, and the west surface filter removing 52% of SRP load and having no effect on TP load. The findings highlight the importance of filter sizing and design to minimize the impact of sediment loading and preferential flow pathways on surface EOF filter performance. The study provides early evidence that tile drain filters are a highly effective management strategy for mitigating SRP and TP losses from agricultural fields.
Download or read book Phosphorus Loading Models for Indiana Lakes written by Anne Spacie and published by . This book was released on 1980 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vermont Lake Champlain Basin Watershed Phosphorus Management Study written by Eugene Alan Cassell and published by . This book was released on 1998 with total page 230 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 1991 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Evaluation of Phosphorus Budgets and Trophic Status Models for Adirondack Lakes written by Scott C. Martin and published by . This book was released on 1979 with total page 400 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 1991 with total page 1424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Analysis of Phosphorus Loading and Trophic State in Fletchers Lake Nova Scotia written by Joanna Poltarowicz and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fletchers Lake, Fall River, Nova Scotia, is located within a diverse watershed, and is influenced by urban stormwater runoff, wastewater discharge and on-site septic systems. Due to the lake's multi-uses and more planned development within the watershed, the Halifax Regional Municipality has identified accelerated eutrophication as a critical issue. With limited historical data on Fletchers Lake trophic parameters, there is a need for baseline data to identify future changes. A mass balance model identified the largest phosphorus (P) sources: headwaters and on-site septic systems. Baseline P export from the lake's tributaries was measured, and P export coefficients were calculated for forested and low-density residential land use. Forested export coefficients varied between subwatersheds. The lowdensity residential coefficient was lower than an urban export coefficient widely applied in P prediction models. Trophic parameters, total phosphorus, nitrogen, chlorophyll a, measured as oligotrophic. Secchi depth measured as mesotrophic likely due to high humic contents.
Download or read book Dynamic Mass Balance Model of Internal Phosphorus Loading in St Albans Bay Lake Champlain written by and published by . This book was released on 1994 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Limnology of Lake Champlain written by Glenn E. Myer and published by . This book was released on 1979 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimates of the Annual Loading of Total Phosphorus to Lake Champlain written by Kenneth G. Bogdan and published by . This book was released on 1978 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
