depth-averaged flow; system of shallow water; continuity equation; temperature equation; Utnes scheme; upwinding Tabata method
A two-dimensional depth-averaged flow and temperature model was applied to study the circulation patterns in the Oder (Szczecin) Lagoon located on the border between Germany and Poland. The system of shallow water and temperature evolution equations is discretized with the modified Utnes scheme , which is characterized by a semi-decoupling algorithm. The continuity equation is rearranged to Helmholtz equation form. The upwinding Tabata method  is used to approximate convective terms. Averaged flow fields under prevailing wind conditions in August were calculated. The temperature variations were also simulated during the flood period in summer 1997. Simulation results are presented and limitations of the model are discussed.