QUALITY SIMULATION ALONG RIVERS (QUASAR) - AN APPLICATION TO THE YORKSHIRE OUSE

The water quality model QUASAR (Quality Simulation Along Rivers) has b een applied as part of the UK LOIS (Land Ocean Interaction study) proj ect to simulate water quality in the Yorkshire Ouse. QUASAR has been c alibrated using data obtained by the Yorkshire and Northumbria region of the Environment Agency (EA) in 1990, and validated using data colle cted for 1991 to 1993. A new methodology is outlined for estimating fl ows and water quality for the important ungauged tributaries in this r iver network. Results show that QUASAR can be used to simulate flow an d water quality in a complex river systems such as the Yorkshire Ouse. The importance of accounting for point source and non-point source po llution is illustrated. Results of a basic sensitivity analysis of the model applied to one of the rivers of this system is also described. (C) 1997 Elsevier Science B.V.