Seite - 589 - in Book of Full Papers - Symposium Hydro Engineering

influence on the resulting overtopping heights. To figure out these influences in a first step, the relation of impact momentum (i.e. block mass times sliding velocity) and the required reduction of water level to prevent overtopping were analyzed (Fig. 7). Fig. 6 Relation of ice block to reservoir volume in function of overtopping height (left) and relation of ice block to remaining reservoir volume in function of required reduction of the FSL (right) Relation entre le bloc de glace et le volume du réservoir en fonction de la hauteur de déversement (à gauche) et la relation entre le bloc de glace et le volume restant du réservoir en fonction de la réduction nécessaire de la FSL (à droite) Fig. 7 Analyses of impact momentum and required reduction of reservoir water level to prevent overtopping Analyses de la dynamique d'impact et de la réduction requise du niveau d'eau du réservoir pour éviter le déversement From that analysis, it gets clear that some blocks have over-proportional impact in relation to their impact momentum. For instance, blocks B9 (violet dots) and B3 (red dots) do require significantly less reduction for preventing overtopping than other blocks with comparable impact momentum because their impact direction is less critical. Each block is represented by 2 dots (one for each estimated volume). For block B-1 additionally a third dot is drawn to indicate the 589