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Dissolved Oxygen Modeling Of Small Streams
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Book Synopsis Dissolved Oxygen Modeling of Small Streams by : Elizabeth Coronado Moran
Download or read book Dissolved Oxygen Modeling of Small Streams written by Elizabeth Coronado Moran and published by . This book was released on 1979 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Calibration of a Dissolved Oxygen Model for Iowa Streams by : Kao-Yeong Tang
Download or read book Calibration of a Dissolved Oxygen Model for Iowa Streams written by Kao-Yeong Tang and published by . This book was released on 1984 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling the Impact of Logging Debris on the Dissolved Oxygen Balance of Small Mountain Streams by : John David Berry
Download or read book Modeling the Impact of Logging Debris on the Dissolved Oxygen Balance of Small Mountain Streams written by John David Berry and published by . This book was released on 1974 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous research has indicated that considerable amounts of finely divided slash accumulate in small mountain streams following timber harvesting. The subsequent biological decomposition of this organic matter can result i.n the reduction of dissolved oxygen (DO) concentration to levels as low as 0.6 ppm. These DO levels are lethal to the salmon and trout fry which inhabit these waters during the summer months. The purpose of this study was to verify the results of previous research on the biochemical oxygen demand (BOD) characteristics of Douglas-fir needles, western hemlock needles, and red alder leaves, and to develop an oxygen balance model to describe the effect of logging debris BOD on the dissolved oxygen of small mountain streams. The concept of the leaching process was examined and refined. As a result K4, the leaching rate constant, was introduced to describe the addition of leachate to the stream. This necessitated redefining K1, the first order decay rate constant, as it had been reported in previous studies. Slash may be described by its ultimate oxygen demand, or potential BOD, and two rate constants, K1 and K4. Manometric BOD tests were run for 20-day periods to estimate the potential BOD and the rate constants K1 and K4. The 20-day ultimate BOD, K1 and K4 estimates at 20°C were: 139mg 02 /gm (dry weight), 0.266 and 0.189 per day for Douglas-fir needles, 183mg 02/gm (dry weight), 0.202 and 0.089 per day for western hemlock needles, and 226 mg 02/gm (dry weight), 0.121 and 0.141 per day for red alder leaves. Laboratory experiments designed to examine the possibilities of occurrence and impact of nitrification on the oxygen demand curve concluded that even though it is possible to observe nitrification under special conditions, coastal streams are generally too nitrogen and carbon poor for nitrification to exert a significant oxygen demand. Even with the addition of large amounts of vegetation to the stream water, an available form of nitrogen must be added to produce detectable amounts of nitrogenous oxygen demand. It was found that the presence of nitrification cannot be detected in small mountain streams by nitrate analysis because of rapid fixation of nitrogen. Thus, the nitrification process appears to be of more concern for evaluating nutrient pathways and fixation than oxygen demand. The leachate of the Douglas-firs western hemlock, and red alder vegetation was analyzed for sugar and phenol concentration and rate of leaching. The vegetation was gas sterilized using ethylene oxide. The sterile vegetation was placed in autoclaved aliquots of water and sealed. The leachate of each vegetation type was analyzed at periodic intervals over 90 days, and the leachate expressed in glucose and gallic acid equivalents. Of the 120 samples treated, only one showed signs of contamination. The sugar and phenolic release rate constants for Douglas-fir and western hemlock were very similar; 0.049 and 0.062 for Douglas-fir sugars and phenols respectively and 0.060 and 0.046 for western hemlock sugars and phenols. All of these rates are less than the leaching rates derived by BOD experimentation. These differences may be due to biological interaction in the leaching process. The leaching rate constants for red alder leaves were much higher than the experimental rates, 0.88 and 0.187 for sugars and phenols respectively. The mean maximum sugar concentration was: 117 mg glucose equivalent / gm (dry weight) for Douglas-fir needles, 86 mg glucose equivalents / gm (dry weight) for western hemlock needles, 121 mg glucose equivalents / gm (dry weight) for red alder leaves, and 50 mg glucose equivalent/gm (dry weight) for dissected Douglas-fir twigs. No rate constant was computed for Douglas-fir twigs because of the lack of fit to an exponential function. Experimentation of the effects of temperature showed & significant response of potential BOD, K1 and K4 to variations in water temperature from 15 to 27°C. In general, ultimate BOD, K1 and K4 values increased with increasing water temperature. The effect of mass concentration on ultimate BOD, K1 and K4 were negligible for vegetative loadings of 4 to 16 gm, fresh weight per liter. The second phase of this study involved constructing a finite difference model of the dissolved oxygen balance in small mountain streams. A fixed cell approach was used to demonstrate the negligible effects of dispersion on pollutant and oxygen concentration. This then allowed the use of the much more efficient Lagrange variation of the finite difference modeling technique, utilizing a moving cell. By using available data and estimates of the distribution of slash in a simulated stream following clearcutting along 991 ft of the stream, DO levels as low as 5.72 ppm were computed for the simulated stream 5890 ft below the top of the clearcut. At these DO concentrations, salmon and trout fry experience "critical" stress conditions. Further model runs indicated that by reducing the length of the clearcut or by removing a portion of slash this condition could be avoided.
Book Synopsis Modeling Diurnal Fluctuations in Stream Temperature and Dissolved Oxygen by : A. D. Kartchner
Download or read book Modeling Diurnal Fluctuations in Stream Temperature and Dissolved Oxygen written by A. D. Kartchner and published by . This book was released on 1969 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A One-dimensional, Steady-state, Dissolved-oxygen Model and Waste-load Assimilation Study for Cedar Creek, Dekalb and Allen Counties, Indiana by :
Download or read book A One-dimensional, Steady-state, Dissolved-oxygen Model and Waste-load Assimilation Study for Cedar Creek, Dekalb and Allen Counties, Indiana written by and published by . This book was released on 1979 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modelling the Dissolved Oxygen Change in Streams Using Nonlinear Regression by : Canada. Department of the Environment. Inland Waters Directorate
Download or read book Modelling the Dissolved Oxygen Change in Streams Using Nonlinear Regression written by Canada. Department of the Environment. Inland Waters Directorate and published by . This book was released on 1988 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Factors Affecting Minimum Dissolved Oxygen Concentration in Streams by : Christopher Robert Huhnke
Download or read book Factors Affecting Minimum Dissolved Oxygen Concentration in Streams written by Christopher Robert Huhnke and published by . This book was released on 2018 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling water quality has been shown to be a useful tool in strategizing water quality management. Dissolved oxygen (DO) has one of the largest impacts on water quality compared to other parameters. The purpose of the dissertation research is to generate a regression equation model, using the US EPA QUAL2K model as the base, to determine different factors affecting minimum dissolved oxygen concentrations in streams, to determine the critical distance for the minimum dissolved oxygen concentration, and the magnitude of impact of each parameter. Based on regression analysis, the factors affecting minimum DO in river water are effluent biochemical oxygen demand, effluent flow rate, river flow rate, river temperature, and effluent DO in that order. The simulation study of QUAL2K is related to stream classification and degree of treatment of municipal wastewater. Important factors affecting minimum dissolved oxygen concentrations in streams and corresponding critical distance or critical time in streams, which receive municipal wastewater treatment plant effluent discharge, include effluent BOD, river Q, effluent Q, and river temperature. Based on regression analysis, the factors affecting minimum DO in river water are effluent BOD, effluent Q, river Q, river temperature, and effluent DO, in that order. The application of the end result of this study can be used to determine the degree of municipal wastewater treatment to maintain a desirable stream classification and river water quality.
Book Synopsis A Mathematical Model of Dissolved Oxygen in Streams Under Unsteady Hydraulic Conditions by : Michael E. Meadows
Download or read book A Mathematical Model of Dissolved Oxygen in Streams Under Unsteady Hydraulic Conditions written by Michael E. Meadows and published by . This book was released on 1976 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modelling the Dissolved Oxygen Change in Streams Using Nonlinear Regression Analysis by : A. H. El-Shaarawi
Download or read book Modelling the Dissolved Oxygen Change in Streams Using Nonlinear Regression Analysis written by A. H. El-Shaarawi and published by Burlington, Ont. : Inland Waters Directorate. This book was released on 1988 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of nonlinear regression analysis to observed stream dissolved oxygen concentrations, by means of an oxygen mass-balance equation, provided estimates of the model parameters, which enabled further determination of the component processes in the oxygen metabolism in a segment of flowing water. The procedure was also used to identify photosynthesis-light (P-1) models for a Canadian river. Five P-1 models were examined in terms of showing the goodness of fit using nonlinear photosaturation and photoinhibition models.
Book Synopsis Modeling the Effect of Waste Discharges in a Small Mountain Stream by : Robert C. Hoehn
Download or read book Modeling the Effect of Waste Discharges in a Small Mountain Stream written by Robert C. Hoehn and published by . This book was released on 1975 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimating Water Temperatures in Small Streams in Western Oregon Using Neural Network Models by : John C. Risley
Download or read book Estimating Water Temperatures in Small Streams in Western Oregon Using Neural Network Models written by John C. Risley and published by . This book was released on 2003 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reaeration-coefficient Measurements of 10 Small Streams in Wisconsin Using Radioactive Tracers by : R. S. Grant
Download or read book Reaeration-coefficient Measurements of 10 Small Streams in Wisconsin Using Radioactive Tracers written by R. S. Grant and published by . This book was released on 1976 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simulation of Dissolved Oxygen and Biochemical Oxygen Demand, Plantation Canal, Broward County, Florida with an Evaluation of the QUAL-I Model for Use in South Florida by : Thomas N. Russo
Download or read book Simulation of Dissolved Oxygen and Biochemical Oxygen Demand, Plantation Canal, Broward County, Florida with an Evaluation of the QUAL-I Model for Use in South Florida written by Thomas N. Russo and published by . This book was released on 1975 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selected Water Resources Abstracts by :
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1989 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Users Guide by : Marion Willson Corey
Download or read book Users Guide written by Marion Willson Corey and published by . This book was released on 1980 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Stochastic Model for Predicting the Probability Distribution of the Dissolved-oxygen Deficit in Streams by : I. I. Esen
Download or read book A Stochastic Model for Predicting the Probability Distribution of the Dissolved-oxygen Deficit in Streams written by I. I. Esen and published by . This book was released on 1976 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: A description of the development and application of a stochastic model for predicting the probability distribution of the dissolved-oxygen deficit at points in a stream downstream from a waste source.
Book Synopsis Oxygen Relationships in Small Streams by : John H. Austin
Download or read book Oxygen Relationships in Small Streams written by John H. Austin and published by . This book was released on 1969 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: