Download or read book Assessment and Validation of Modelling Under ice Dissolved Oxygen Using DOSTOC Athabasca River 1988 to 1994 written by Patricia A. Chambers and published by . This book was released on 1996 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this study was to examine the existing model approach and to make recommendations for improved modelling of under-ice dissolved oxygen (DO) concentrations in the Athabasca River. Previous modelling efforts have involved using the DO simulation model DOSTOC, but discrepancies between observed and predicted DO concentrations for 1992 and 1993 highlighted the needs for a review and assessment of the modelling approaches used. This report reviews the structure of the DOSTOC model and input data used for modelling, then describes a stochastic run of the model using the best available values for input data and process rates, including revised rates and ratios for converting five-day biological oxygen demand (BOD) values to ultimate BOD values, measured values for sediment oxygen demand and sedimentation, and a temperature correction for pulp mill BOD decay rates. Simulation results indicate whether the model could predict DO for 1990-94 winters. Regression equations were also developed relating DO concentration to river distance.

Download or read book Technical Reports of the Northern River Basins Study by Subject and Geographical Area Studied written by Mark S. J. Ouellett and published by . This book was released on 1997 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists Northern River Basins Study technical reports by issue number, subject, and geographic area studied. Subject areas used to classify the reports are: hydrology/hydraulics, nutrients/dissolved oxygen, contaminants, food chain, drinking water, other uses, traditional knowledge, and synthesis and modelling. Ten geographic divisions are used: three each for the Athabasca and Peace Rivers, and one each of the Wapiti/Smoky rivers, Peace-Athabasca Delta, Lake Athabasca, and Rivière des Rochers/Slave River.

Download or read book Northern River Basins Study written by Northern River Basins Study (Canada) and published by . This book was released on 1996 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report to the federal ministers of Environment and Indian & Northern Affairs, Alberta's Minister of Environmental Protection, and NWT's Minister of Renewable Resources. Summarises the main scientific findings of the Northern River Basins Study, which was established to examine the relationship between industrial, municipal, agricultural, and other development and the Peace, Athabasca, and Slave River basins. Reviews the characteristics of the northern river basins and their peoples, the organisation of the Study, and major findings in the areas of environmental overview, use of aquatic resources, traditional knowledge, flow regulation, fish distribution and habitat, nutrients, dissolved oxygen, contaminants, drinking water, ecosystem health, modelling, human health, and cumulative effects. Recommendations by the Study Board, First Nations, and scientific advisors regarding such issues as basin management, monitoring, research, public participation, and a successor organisation are then presented. Also includes a summary of opinions, suggestions, and recommendations expressed at 17 community workshops held throughout the northern river basins area.

Download or read book An Evaluation of Dissolved Oxygen Modelling of the Athabasca River and the Wapiti Smoky River System written by Gary MacDonald and published by Edmonton, Alta : The Study. This book was released on 1993 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: An important component of an overall mutrients model for the northern river systems is the development of appropriate dissolved oxygen models. This study tries to assess the ability of the models (dissolved oxygen model DOSTOC) to predict observed conditions and to identify field research needs for model refinement.

Download or read book A Review and Evaluation of Water Quality and Quantity Models Used by the Northern River Basins Study written by Edward McCauley and published by The Study. This book was released on 1997 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summarizes the major modelling projects undertaken to model water quality in the Peace, Athabasca, and Slave river systems. The first section describes the scope of the problem of modelling water quality in large complex systems that are relatively oligotrophic, located at relatively high altitudes, and experience highly seasonal environmental fluctuations. It also provides a summary of the models used to predict key water quality variables. Section 2 gives a general overview of the utility and shortcomings of water quality models, with the goal of establishing key criteria for assessing the successes of models developed by the Northern River Basins Study (NRBS). Section 3 summarizes key findings of the NRBS models and evaluates the results against criteria outlined in section 2. Section 4 presents a series of recommendations for modelling dissolved oxygen, transport and fate of contaminants, and distribution of contaminants in the food chain, along with strategic suggestions for future work.

Download or read book Dissolved Oxygen Conditions and Fish Requirements in the Athabasca Peace and Slave Rivers written by Patricia A. Chambers and published by . This book was released on 1996 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NTBS was designed to address the ecological concerns about pulp mill expansion, and to increase scientific knowledge about environmental conditions [ecology, ecosystem sustainability, water pollution and control, habitat, effect on fish and fishing, etc.] in the major river systems of the north. The study's objectives were to gather and interpret sound scientific information about the basins, develop appropriate recommendations for basin management, and communicate effectively with the public. The government response report confirms the governments' commitment to ecosystem sustainability and to pollution control in northern rivers. First Nations and Metis aboriginal [native] peoples contributed significantly to the NRBS.

Download or read book Assessment and Validation of Dissolved Oxygen Modelling for the Northern River Basins Study NRBS written by Patricia A. Chambers and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Freshwater Ecosystems and Climate Change in North America written by Colbert E. Cushing and published by John Wiley & Sons. This book was released on 1997 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freshwater Ecosystems and Climate Change in North America brings together a group of experts from the fields of geochemistry, climatology, hydrology and aquatic ecology to address the central question, What would be the impact to and response of freshwater ecosystems in your region as a result of a hypothetical doubling of CO2 in the atmosphere? These regional papers and syntheses will provide a solid foundation upon which scientists can proceed and build in their efforts to provide other scientists, regulators, and decision-makers with meaningful information concerning the important phenomena associated with climate change.

Download or read book An Evaluation of Dissolved Oxygen Modelling of the Athabasca River and the Wapiti Smoky River System written by Northern River Basins Study (Canada) and published by . This book was released on 1993 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissolved Oxygen Model and Passive Samplers for the Athabasca River written by Nancy Martin and published by . This book was released on 2014 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis documents the research undertaken to develop and assess modeling and monitoring tools to improve the water quality management in the Athabasca River, Alberta. The Upper Athabasca River (UAR) has experienced dissolved oxygen (DO) sags, which may affect the aquatic ecosystem. A water quality model for an 800 km reach of this river was customized, calibrated, and validated for DO and the factors that determine its concentration. The model showed that the sediment oxygen demand (SOD) represents about 50% of the DO sink in winter. The DO calibration was improved by implementing an annual SOD based on the biochemical oxygen demand (BOD) load. The model was used to estimate the assimilative capacity of the river based on a trigger DO concentration of 7 mg/L. The results revealed a maximum assimilative BOD load of 8.9 ton/d at average flow conditions, which is lower than the maximum permitted load. In addition, the model predicted a minimum assimilative flow at average BOD load of 52 m3/s. A three-level warning-system is proposed to manage the BOD load proactively at different river discharges. Other mitigation options were explored such as upgrading the wastewater treatment from the major BOD point source, and oxygen injection into the effluents. The model can be used as a management tool to forecast the DO in low flow years and evaluate mitigation measures. After improving the modeling tools for the UAR, monitoring tools for the Lower Athabasca River (LAR) were assessed. Naphthenic acids (NAs) have been identified as a main toxic component in the oil sands process affected water. However, it is desired to improve the current monitoring methods for NAs. Having a state-of-the-art monitoring system to quantify NAs in the LAR and its tributaries will allow calibrating robust models for this reach of the Athabasca River in the future. Passive samplers and the application of fluorescence spectroscopy using organic solvents were explored as a cost-effective alternative to quantify mass loading of NAs. Nine organic solvents, polar protic (methanol, ethanol, and propanol), polar aprotic (dichloromethane, acetone, and acetonitrile) and non-polar (hexane, toluene, and diethyl ether) were evaluated for quantification of NAs using fluorescence. The calibration curves of the polar protic solvents performed the best with lower light scattering and higher method sensitivity. Methanol was selected for further experiments having a strong linearity for concentrations lower than 250 mg/L (R2 > 0.99), and a low relative standard deviation ( 10%). The synchronous fluorescence mode with a reduced offset value of Dl= 10 nm demonstrated potential for fingerprinting. Two passive samplers, the polar organic chemical integrative sampler (POCIS) and the Chemcatcher, were assessed for naphthenic acid monitoring. POCIS presented high partitioning of NAs to the polyether-sulphone (PES) membrane in combination with low diffusion to the resin. The Chemcatcher sampler with PTFE (Teflon ®) membrane and C18 disk presented a high mass transfer, and it was further evaluated using commercial NAs. The sampler was integrative for a 30-day experiment having a reduced lag time, allowing the sampler to satisfactorily account for changes of NAs concentration in water. The temperature and turbulence had a high effect on the uptake rate with a 4-fold increase from 4 to 20 oC, and a 2-fold increase from 60 to 300 rpm. Furthermore, the uptake rate of commercial NAs was lower using river water, likely due to partitioning to colloids. The uptake rate of NAs from the oil sands process water was one order of magnitude lower than that obtained for commercial NAs, which may be due to the selective adsorption of acyclic (Z = 0) compounds with high number of carbons (n). These compounds were more abundant in the commercial NAs. Uptake rates may be required for each compound or group of compounds in the NA mixture depending on the n and Z distribution. Due to the complexity of the NAs mixture ( 3000 different compounds at isomer level), it is recommended to target the compounds with greater toxicity and abundance for further uptake rate evaluation and sampler optimization.

Download or read book A Review of Dissolved Oxygen Modelling on the Athabasca River written by Louis Schmittroth and published by . This book was released on 1989 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigations of Streambed Oxygen Demand Athabasca River October 1994 to March 1995 written by Leigh Noton and published by . This book was released on 1996 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents findings of a project conducted to determine whether streambed oxygen demand (SOD) rates in the Athabasca River are consistently higher downstream of effluent inputs during winter, how the trend varies throughout the winter, and whether SOD is influenced directly by nutrient loads from effluents. Investigators obtained SOD measurements at 13 locations from upstream of Hinton downstream to the Calling River. The substrates at these locations were mainly coarse, with pebble, cobble, and boulder predominating. Controlling factors affecting SOD are discussed.

Download or read book A Dissolved Oxygen Model and Sediment Oxygen Demand Study in the Athabasca River written by Yinglun Tian and published by . This book was released on 2005 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Continuous Dissolved Oxygen Modelling Athabasca River Hinton to Upstream Grand Rapids written by Golder Associates and published by . This book was released on 1995 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Application of a Dissolved Oxygen Model to an Ice covered River written by A. Pietroniro and published by . This book was released on 1998 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissolved Oxygen Requirements for Fish of the Peace Athabasca and Slave River Basins written by B. A. Barton and published by The Study. This book was released on 1994 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report of a study investigating the dissolved oxygen requirements of fish, at various life stages, in the Peace-Athabasca-Slave river basins of northern Alberta.

Download or read book Model Calibration and Receiving Water Evaluation for Pulp Mill Developments on the Athabasca River written by Gay MacDonald and published by . This book was released on 1989 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: