Seite - 1150 - in Book of Full Papers - Symposium Hydro Engineering

[3] RAK, G., MÜLLER, M., STEINMAN, F., ŠANTL, S., NOVAK, G. Hydraulic modeling of future hydro power plants on lower Sava, ICOLD Symposium. Austrija, Graz, Verlag der Technischen Universitat Graz, 133–138, 2010. [4] RAK, G., MÜLLER, M., ŠANTL, S., STEINMAN, F. 2012 The use of hybrid hidraulic models in the process of hydropower plants design on the lower Sava, Acta hydrotechnica 25; 42: 59–70, 2012. [5] JIA, Y., WANG S.Y. CCHE2D: Two-dimensional Hydrodynamic and Sediment Transport Model For Unsteady Open Channel Flows Over Loose Bed. School of Engineering, University of Mississippi, 2011. [6] BOMBAČ, M. Hydraulic research of the construction pit of HPP Brežice on a physical model. Acta hydrotechnica 25; 42: 1–17, 2012. [7] INŠTITUT ZA VODE RS. Hidrološka študija pritokov Save – na odseku od vtoka Savinje do državne meje, C-1261. Ljubljana, 2004. [8] INŠTITUT ZA VODE RS. Verjetnostna analiza spremenjenih vrednosti visokih vod Save za v.p. Radeče, Ljubljana, 2011. [9] RAK, G., KOZELJ, D., STEINMAN, F. The impact of floodplain land use on flood wave propagation. Natural hazards 83; 1: 425-443, 2016. SUMMARY In the planning stage of the interventions in water space and riparian areas hydraulic model research of runoff regime is an established tool in the search of the final solution, which in addition to providing the functionality provides the preservation or mitigation of flood and erosion hazard. To support construction, stepwise planning of temporary structures and measures, etc., is crucial as well. The importance of analysing the runoff regime in a particular intermediate phase of the construction is mainly reflected in siting of an extensive and complex intervention, the construction of which takes place a long time, with changing environmental and hydraulic conditions. One should be aware that during the period of construction the temporary state in the area (particularly in an intermediate phase of construction) could have a significantly more adverse effect on the runoff regime (and consequently on adjacent activities and space users) than a final design state. Temporary flood hazard hydraulic analysis in the planning of construction phases is presented on the case of siting interventions according to the national spatial plan of HPP Brežice, to identify potential intermediate increase of hazard and risk, higher than that predicted for the HPP under full operation. Consequently, the planned construction process was adapted and optimized, which helped to reduce risks as well as costs. Keywords: Power Plant, Construction Phase, Flood Control, Numerical Model, Physical Model 1150