A NUMERICAL-SIMULATION OF TRANSPORT AND SEDIMENTATION OF SUSPENDED PARTICLES IN LAKE-NEUCHATEL

The dispersion and sedimentation of suspended particulate matter in La ke Neuchatel are studied with a numerical model. To simulate the curre nts in the lake, a three dimensional general circulation model is appl ied. A six weeks run is performed under late autumn conditions, in whi ch the particle load of rivers entering the lake is high. Meteorologic al wind data and realistic thermal stratification are included in the model. At the Areuse river output, particles are injected into the lak e. In addition to their advection by the currents, the particles posse ss a vertical settling velocity. The simulation indicates that privile ged deposition areas for suspended particulate matter which is dischar ged by the Areuse river, are confined to the north-east region of the lake.