D-BAUG - Departement Bau, Umwelt und Geomatik - ETH Zürich

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Fig. 1: Terminal B, Zurich International Airport, shortly before refurbishment. Fig 3: Test preparation (fixing of measuring devices) at the bottom side of the profiled steel sheeting. a b Infrastructure Systems / Resources ▪ Highlights Fig. 2: Large-scale in situ tests on composite slabs with profiled steel sheeting – Testing procedure and test set-up. Fig 4: In situ tests on composite slabs with profiled steel sheeting – Top view cantilever beam test. Fig. 5a + 5b: Experiment (a) and analytical model (b) of the shear band propagation in shear-blade test. a b Abb. 6a + 6b: (a) Analytical model for the calculation of the initial slide velocity in a submerged landslide; (b) Weggis slide (from Strasser, Diss. ETH 17285, 2008). D-BAUG Annual Report 2009 ▪ 61
Highlights ▪ Resources Flood control measures at the “Kleine Emme” River Physical experiments on drift wood retention at the‘Kleine Emme’River near Malters, Canton Lucerne. The 2005 flood event caused large damages in many regions in Switzerland and so in the area of the Kleine Emme River. Initiated by this event, a combined approach including hydro power production and drift wood retention with a diversion channel and a drift wood rack (Fig. 1) for the Malters river stretch at the Kleine Emme has been projected. The Canton Lucerne has assigned the VAW to test and optimize the given configuration with the help of a physical model on a 1:50 scale with focus on flood protection aspects and the efficiency of the drift wood retention. The experiments showed that, with the given configuration, the intended efficiency of 50 % of retained drift wood can be achieved; however, certain flood protection aspects were not fulfilled.To improve the situation, a new concept regarding the direction of the approach flow towards the drift wood rack (parallel instead of frontal approach flow) (Fig. 2) has been tested.The parallel approach flow in combination with an area of recirculating flow, led to the same efficiency of retained drift wood, plus strongly improved flood safety conditions.This improvement can be explained by a reduced tendency of the drift wood for piling up in front of the drift wood rack with parallel approach flow, leading to reduced backwater effects. The final design includes a second drift wood rack downstream of the first one, which increases the drift wood retention efficiency by approximately 10 %, resulting in a total retention efficiency of roughly 2/3 of the oncoming drift wood. 62 ▪ D-BAUG Annual Report 2009 Flood protection project “Linth 2000” Hybrid modelling of a spillway to prevent dam breaks at the Linth Canal. by S. Tamagni, V. Weitbrecht / VAW by P. Seitz, Th. Berchtold, V. Weitbrecht, D. Vetsch / VAW Since river engineering and flood protection concepts are designed to work properly not only under design conditions, but as well for the overload scenario, the flood protection project “Linth 2000” is investigated at the VAW using a hybrid modelling approach, where physical and numerical experiments are combined. A regulated overfall weir in an 800 m long newly built local river widening is planned to limit the downstream discharge in the Linth Canal. The spillway is designed to reduce the peak flow of 500 m 3 /s in the canal to a maximum of 420 m 3 /s. The mean discharge in the Linth Canal is about 54.6 m 3 /s. In the laboratory, the physical model on a 1:30 scale covers 90 m 2 . It includes parts of the local widening, the spillway and the runoff in the stream course downstream of the spillway (Fig. 3). To assess upstream boundary conditions for the physical model, numerical simulations are performed covering a larger flow domain up- and downstream of the local widening (Fig. 3). In the numerical model, the water levels, the bed shear stress and the averaged flow velocities are calculated for several flood scenarios. In the physical model, the functionality of the spillway and the riverbed stability are tested. For the numerical computations, the modular software BASEMENT that has been developed at VAW is used.
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D-BAUG - Departement Bau, Umwelt und Geomatik - ETH Zürich

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