Steady-State Water Quality Modeling in Streams

by Robert Willis, (A.M.ASCE), Asst. Prof.; School of Civ. and Environmental Engrg., Cornell Univ., Ithaca, N.Y.,
John A. Dracup, (M.ASCE), Assoc. Prof.; Engrg. Systems Dept., School of Engrg. and Applied Sci., Univ. of California, Los Angeles, Calif.,
Donald R. Anderson, (M.ASCE), Asst. Prof. and Chmn.; Dept. of Civ. Engrg., Loyola Marymount Univ., Los Angeles, Calif.,

Serial Information: Journal of the Environmental Engineering Division, 1975, Vol. 101, Issue 2, Pg. 245-258

Document Type: Journal Paper


A general mathematical model for simulation of conservative and nonconservative constituents in streams and rivers is developed. Mass transport of constituents is accomplished by advection and biochemical reactions. The models simulate the interaction of the dissolved-oxygen resources of the water system with the nitrogen cycle, chlorophyll a, and carbonaceous biochemical oxygen demand. Also, conservative substances and phosphorous uptake by algae and coliforms are simulated by the model. The results of applying the model to the Truckee River system in northern California and Nevada are presented. The model has demonstrated the ability to simulate historical water quality conditions and to be a flexible easily adaptable planning tool.

Subject Headings: Water quality | Simulation models | Mathematical models | Steady states | Hydrologic models | Rivers and streams | Water resources | Decision support systems | United States | California | Nevada

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