Two-Dimensional Modelling of Flow in the River Sava

by Rudi Rajar, Univ of Ljubljana, Ljubljana, Slovenia,
Matjaž Četina, Univ of Ljubljana, Ljubljana, Slovenia,

Abstract: On the river Sava near Ljubljana, a sports centre with a kayak racing channel was built in 1948. For the world championship in kayak-canoe racing in 1990 totally new racing channel had to be built, since the old one did not correspond to the international racing norms. The planned reconstruction of the channel, with several new constructions (stands, platforms) demanded answers of the following questions: 1. How will the changed topography influence the water levels at high water flows (flooding of some houses along the banks was in question). 2. How will the discharge over a weir be distributed between the racing channel and the main river channel. 3. How to design the new racing channel to get the optimum performance. All three problems were solved by a 2D depth-averaged mathematical model. Basic equations were used in the conservative form. They were solved by a finite-volume numerical method. A combined central-differences and upstream differences were used and an implicit iterative scheme was applied for the solution. The model showed very good performance even for the simulation of the highly turbulent flow in the racing channel. Only the first problem is described more in detail. References are given for the modelling of the flow in the racing channel.

Subject Headings: Two-dimensional models | Hydrologic models | Two-dimensional flow | Channel flow | Turbulent flow | High-rise buildings | Water flow | Mathematical models | Finite volume method | Numerical methods | River flow | Slovenia | Europe | Ljubljana

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