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Showing 1 to 20 of 48 for “"water quality model"”.
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Spring Hollow Reservoir: Application of a two-dimensional water quality model
The BETTER water quality model, created by TVA, was used to model the temperature and dissolved oxygen (DO) in Spring Hollow Reservoir. The water balance consisted of pump discharge from the Roanoke River, runoff, releases at the dam, leakage, and storage. The geometry of the reservoir was …
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Estimating Uncertainty in HSPF based Water Quality Model: Application of Monte-Carlo Based Techniques
… a methodology for the uncertainty estimation in water quality modeling as related to TMDL development, four Monte Carlo (MC) based techniques—single-phase MC, two-phase MC, Generalized Likelihood Uncertainty Estimation (GLUE), and Markov Chain Monte Carlo (MCMC) —were applied to a Hydrological …
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Implementation of the IWA River Water Quality Model no. 1 in US EPA WASP 5.0
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2002.
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A water quality model for shallow river-lake systems and its application in river basin management
… the development and application of a new model for simulating mass transport and turnover in rivers and shallow lakes. The simulation tool called 'TRAM' is intended to complement mesoscale eco-hydrological catchment models in studies on river basin management. TRAM aims at describing the …
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A Complex, Linked Watershed-Reservoir Hydrology and Water Quality Model Application for the Occoquan Watershed, Virginia
The Occoquan Watershed is a 1515 square kilometer basin located in northern Virginia and contains two principal waterbodies: the Occoquan Reservoir and Lake Manassas. Both waterbodies are principal drinking water supplies for local residents and experience eutrophication and summer algae growth. …
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Modification of the Field Moisture Balance Water Quality model (FMBWQ) to simulate subsurface drainage and preferential flow
… rains which shows the preferential movement of water through macropores. Considering this, it was also deemed necessary to add a preferential flow subroutine to FMBWQ. Under these modeling conditions, the following specific objectives were laid out: 1) to improve or replace the existing tile …
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Development and application of a three-dimensional water quality model in a partially-mixed estuary, Southampton Water, UK
… this research was to develop a 'transportable' water quality model for the Solent and Southampton Water estuarine system, as a part of an effort to examine the effects of human activity and natural processes on estuarine water quality. Dissolved oxygen (DO), as a main indicator of water quality, …
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The use of a water quality model to evaluate the impacts of combined sewer overflows on the lower Hudson River
… long been recognized as a significant source of water pollution. While many sources of water pollution have been controlled over the past 20 years, CSOs continue to be a main environmental concern in several areas, especially in old cities. In the past, most CSO research focused on the CSO …
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Variations in waste load allocations through sensitivity analysis of the QUAL-II water quality model on the South River, Virginia
Sensitivity analysis was performed on the QUAL-II water quality model. The reaeration rate, the ammonia nitrogen oxidation rate, and the carbonaceous deoxygenation coefficient were found to be highly sensitive in the model. Only moderate sensitivity was found with the areal flow contribution, the …
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Predicting water quality effects on bay anchovy (Anchoa mitchilli) growth and production in Chesapeake Bay: linking water quality and individual-based fish models
Water quality in the Chesapeake Bay and the Patuxent River has decreased since the 1950s due to an increase in nutrient loadings. Increased nutrient loads have caused an increase in the extent and duration of hypoxic conditions. Restoration via large-scale reductions in nutrient loadings is now …
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An Examination of the Reference Watershed Approach for TMDLs with Benthic Impairments
This research addresses the Reference Watershed Approach (RWA) in the TMDL process for benthic impairments. In the RWA, do different land use sources (DOQQ and NLCD) or use of alternative water quality models (GWLF and SWAT) result in different stressor loadings? Is there a difference in stressor …
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Modeling nitrate in tile-drained watersheds of east-central Illinois
… due to the agricultural nature of their watersheds. Field tile systems provide direct links between leached nitrate and surface drainage systems. The purpose of this study was to develop a model for predicting flow and nitrate loading in a surface drainage ditch at the outlet of a …
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Water Quality Modeling of Freshwater Diversions in the Barataria Basin
A 1-D tidal, salinity and water quality model that analyzes the impacts of freshwater diversions with median and high flow on the water level, salinity and nutrient concentration of the Barataria Basin over a 2 period is presented here. The model predicts that the salinity of Lower Barataria …
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Testing the use of the BASINS PLOAD model to simulate the quality of stormwater runoff from the Kuils River catchment, Cape Town
The interaction between land use and water quality in urban catchments is closely linked. As pollutants accumulate on land surfaces they are carried in runoff. This has led to increasing concerns that stormwater is responsible for adversely affecting the quality of freshwater resources. Total …
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Modelling the Water Quality of the Patos Lagoon, Brazil
A two-dimensional depth integrated finite element modelling suite comprising the flow model TELEN4AC-2D and the water quality model WQFLOW-2D has been calibrated to simulate the physics and chemistry of the Patos Lagoon and Estuary system in southern Brazil for the investigation of nutrients, …
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Dynamic water quality modeling using cellular automata
… The research presented here focused on a modeling approach, known as cellular automata (CA), which is characterized by a high degree of parallelism and is thus well suited to implementation on parallel processors. The inherent degree of parallelism also exhibited by the random-walk …
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OPTIMIZATION FOR CALIBRATION OF WATER RESOURCES SYSTEMS INCLUDING NEW PARALLEL GLOBAL ALGORITHMS AND APPLICATIONS TO HYDRODYNAMICS AND WATER QUALITY LAKE PDE MODELS
… optimization problems and applies them to water resources issues. A new parallel surrogate global optimization algorithm PODS is developed and successfully applied to the calibration of two computationally expensive 3D hydrodynamic lake models (5 hours per simulation). We also introduce …
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Water Quality Modeling of Freshwater Diversions in the Pontchartrain Estuary
A 1-D tidal, salinity and water quality model that analyzes the general effects freshwater diversions have on the water quality of the Pontchartrain Estuary over a 17-year period is presented here. Using the modeled live algae concentrations in conjunction with the algal bloom probability model …
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Algal Succession and Nutrient Dynamics in Elephant Butte Reservoir
A water quality model was created for Elephant Butte Reservoir, New Mexico to understand nutrient dynamics and algal response during a three year period. The model chosen for this study was CE-QUAL-W2 because of its proven ability to represent hydrodynamics and the ability to represent multiple …
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Effects of calcium, sulphur and potassium concentration in overburden on quality of strip mine drainage
… of the environment is vital for preservation of water quality, especially with present increased emphasis on coal production. Analysis of overburden is becoming mandatory in order to plan effective placement of material in spoil piles. One rapid technique with little sample preparation for …
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