Page - 1071 - in Book of Full Papers - Symposium Hydro Engineering

This new design was chosen for further testing with a focus on optimizing the ski-jump design – jet throw length, location of the impact zone etc. The updated design flood also demanded for the guide walls to be heightened, and the model tests were used for optimization of this. Figure 12 shows model testing for the left chute, with the final design of the ski-jump. Figure 12: Ramsele, left spillway – proposed shortened ski jump design (Norconsult, 2016) 4. VERIFICATION OF HYDRAULIC PERFORMANCE IN THE PROTOTYPES After the completed construction of the planned measures, discharge tests are carried out according to accepted international guidelines. Ramsele has already been completed, and here photogrammetry was performed for the spillway channel before the discharge test, focusing on the area where the jet from the ski-jump plunges. This resulted in a topographic model, and if the procedure is repeated in the future after some discharging has occurred, the models can be compared for evaluating erosion propagation. Figure 13 shows a drone photo from the discharge test. Upon completion of the last gate structure at Långströmmen, similar tests will be performed here. Aerial filming by drone is to be supplemented with water level measurements in order to verify the downstream water level during 1071