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REGIONAL WATER QUALITY MANAGEMENT BY THE GENERALIZED REDUCED GRADIENT METHOD 1
Author(s) -
Hwang C. L.,
Williams J. L.,
Shojalashkari R.,
Fan L. T.
Publication year - 1973
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1973.tb05855.x
Subject(s) - water quality , environmental science , streams , quality (philosophy) , nonlinear system , nonlinear programming , temperature gradient , pollutant , hydrology (agriculture) , thermal , computer science , meteorology , engineering , chemistry , geotechnical engineering , ecology , philosophy , physics , organic chemistry , epistemology , quantum mechanics , biology , computer network
A river basin‐wide water quality management system is considered. The river receives thermal as well as organic wastes. At‐source treatment of these pollutants is imposed to control the basin‐wide water quality. The related water quality standards are: the minimum DO concentration, the maximum allowable BOD concentration, the maximum allowable stream temperature, and the allowable rise in stream temperature. The general dynamic mathematical model representing water quality in streams and the thermal effects on BOD and DO concentrations is presented. The model is highly nonlinear in nature. The optimal management problem involving the model is solved by a recently developed nonlinear propgramming technique ‐ the generalized reduced gradient (GRG) method. Comparison of results obtained by the GRG method vs. dynamic programming, and of results using a more realistic mathematical model vs. a simple model are presented. The analysis procedure can be applied to designing new and examining existing water quality programs, and to study the influence of alternate policies and constraints.