Abstract
The purpose of the present study was to establish a water quality model for a river network system in Beijing‐Tianjin, China and to develop a method for estimating parameters in the established model. The Network Grid method, which was used in the study, is based on the solution of optimal problems in the entire river network system. The parameters, the decay rate of total BOD (carbonaceous and nitrogenous), K1, the re‐aeration rate, K2, the decay rate of BOD for settleable solids, K3, the DO constant rate for photosynthesis, K4, and the nitrification rate of ammonia, K5, in network models are estimated simultaneously by the Network Grid method. The comparison of results indicates that the Network Grid method is suitable for the estimation of the parameters in river network model and the concentration distribution of organic pollutants calculated by the model is in accordance with that observed in situ.
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