Author(s): M. Cetina; M. Krzyk
Linked Author(s): Matjaz Cetina
Keywords: Two-dimensional mathematical model; Hydraulic computation; Free surface flow; PCFLOW2D computer code; River Savinja; Town of Lasko
Abstract: A two-dimensional mathematical model of the flow of the River Savinja in the town of Lasko in central Slovenia is presented in this paper. Some theoretical features of the model, including basic equations, a numerical solution method and boundary conditions, are first described. The main characteristics of PCFLOW2D computer code are also presented, with special attention given to data preparation and the presentation of results using the AutoCAD and QuickSurf graphic packages. The model has been applied to a stretch of the River Savinja approx. 780 m long in order to assess the influence of the designed new health centre situated on the left inundation area on the flood situation in Lasko. For different flood discharges ranging from Q100 = 1412 m 3 /s to Q2 = 612 m 3 /s, changes in velocity fields and free surface elevations have been investigated due to the designed hydraulic structures in this area (river training, rubber weir, a small bridge for pedestrians, the new health centre building and the already-constructed motorway bridge to the village of Jagoee). In comparison with the present reference situation, a rise in the water-surface elevation of about 18 cm just upstream of the bridge to Jagocehas been computed at Q100 =1412 m 3 /s. On that basis it has been recommended to the designers of the new health centre that they increase the distance between the main building and the river channel.
Year: 1999