||Generalized Initial Conditions for the Stochastic Model for Pollution and Dissolved Oxygen in Streams.
Moushegia, Richard H. ;
Krutchkof, Richard G. ;
||Virginia Polytechnic Inst., Blacksburg. Water Resources Research Center.
||Bull-28; OWRR-A-027-VA; 01775,; 16090-08/69
( Water pollution ;
Mathematical models) ;
( Rivers ;
Initial value problems ;
Probability density functions ;
Statistical distributions ;
Stochastic processes ;
Mathematical prediction ;
Computer programs ;
Biochemical oxygen demand ;
Dissolved oxygen ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
A stochastic model was developed and used to predict the biochemical oxygen demand (BOD) and dissloved oxygen (DO) concentrations at several points downstream of a waste discharge. The model used provided a joint density function for both pollution and and dissolved oxygen with given initial conditions. The initial conditions were generalized to permit the output for one stream segment to be the initial conditions for the succeeding stream segment. Interest was focused on the measurement of the marginal distribution of BOD and DO along a stream stretch whose parameters may change at known locations. A computer program assisted in the calculations to obtain marginal distributions. The program allowed for changes in parameter values between one stream segment and the next and could predict distributions for any intermediate locations along the river. The application of this study lay in the analysis of an entire stream stretch to determine if it was healthy for the users within certain preset probabilistic standards. (Author)