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Modelling the dissolved oxygen change in streams using nonlinear regression analysis (Scientific series / Inland Waters Directorate) download epub

by A. H El-Shaarawi


Epub Book: 1797 kb. | Fb2 Book: 1328 kb.

Start by marking Modelling The Dissolved Oxygen Change In Streams . by Abdel H. El-Shaarawi. Modelling the dissolved oxygen change in streams using nonlinear regression analysis (Scientific series, Inland Waters Directorate).

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A precise predictive model is needed to obtain a clear understanding of the changing dissolved oxygen content in outdoor crab ponds . The LSSVM is a powerful tool for achieving nonlinear dissolved oxygen content forecasting.

A precise predictive model is needed to obtain a clear understanding of the changing dissolved oxygen content in outdoor crab ponds, to assess how to reduce risk and to optimize water quality management. The uncertainties in the data from multiple sensors are a significant factor when building a dissolved oxygen content prediction model. In addition, an improved particle swarm optimization algorithm is developed to determine the optimal parameters for the LSSVM with high accuracy and generalizability.

Uncertainty analysis in surface water quality modeling is an important issue. Basic uncertainty in the input parameters is considered by representing them as random variables with prescribed probability distributions. Results obtained from FORM analysis compared well with those of the Monte Carlo simulation method.

In statistics, nonlinear regression is a form of regression analysis in which observational data are modeled by a function which is a nonlinear combination of the model parameters and depends on one or more independent variables. The data are fitted by a method of successive approximations

On-site, dissolved oxygen is commonly measured using a membrane electrode . Another region that has exhibited robust oxygen changes is the North Pacific, a vast region of relatively low concentration.

On-site, dissolved oxygen is commonly measured using a membrane electrode of the polarographic type in a flow-through cell. Dissolved oxygen concentrations in streams reflect the balance of oxygen added by both reaeration at the water surface and photosynthesis, and lost through ecosystem respiration and oxidation of contaminants in the water column and boundary sediments. When oxygen consumption exceeds supply, oxygen concentrations decline (Diaz, 2001).

Dissolved oxygen meters are used in a variety of applications to monitor the amount of oxygen present in water. Applications include sewage and water treatment plants, pollution control, fish farms, and various types of manufacturing. Hanna Instruments manufactures a wide variety of analytical instrumentation, including pH meters, multi-parameter meters, electrodes, chemical reagents, and buffer solutions. Founded in 1978, Hanna is headquartered in Woonsocket, RI, with subsidiaries in 32 countries.

Coefficients for the nonlinear model were generated using the nonlinear regression function, nlinfit . The analyzed data indicates unnatural variations in the dissolved oxygen levels for site the furthest down stream.

Coefficients for the nonlinear model were generated using the nonlinear regression function, nlinfit, of the MATLAB programming software.

The dissolved oxygen (DO) is oxygen that is dissolved in water. An simplified formula is given below: Photosynthesis (in the presence of light and chlorophyll)


Modelling the dissolved oxygen change in streams using nonlinear regression analysis (Scientific series / Inland Waters Directorate) download epub
Author: A. H El-Shaarawi
ISBN: 0662160649
Category: No category
Language: English
Publisher: Inland Waters Directorate, National Water Research Institute, Canada Centre for Inland Waters (1988)