WATER-QUALITY MODEL OF THE DANUBE IN ITS BULGARIAN PART

Models for predicting river water quality could assist protection and utilization of water resources under alternative management strategies . The model of the water quality characteristics of the Danube is base d on an ecosystem approach. Considered are all waste water discharges and inflow of tributaries among the catchment area. The identification of model parameters is realized according to the method of integral t ransformation. For the performance of the model a computer program was elaborated. It is applied in predicting the water quality of the Danu be considering almost 20 indicators for the abiotic and biotic paramet ers of river ecosystem.