Case Study: Numerical Simulations of Debris Flow below Sto?e, Slovenia |
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Authors: | Matja? ?etina Rudi Rajar Toma? Hojnik Majda Zakraj?ek Mario Krzyk Matja? Miko? |
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Affiliation: | 1Associate Professor, Faculty of Civil and Geodetic Engineering (FGG), Univ. of Ljubljana, Hajdrihova 28, 1000 Ljubljana, Slovenia. E-mail: mcetina@fgg.uni-lj.si 2Professor, FGG, Univ. of Ljubljana, Hajdrihova 28, 1000 Ljubljana, Slovenia. E-mail: rrajar@fgg.uni-lj.si 3Civil Engineer, Vodnogospodarski Biro, Glavni trg 19c, 2000 Maribor, Slovenia. E-mail: hojnik@vgb.si 4Civil Engineer, FGG, Univ. of Ljubljana, Hajdrihova 28, 1000 Ljubljana, Slovenia. E-mail: mzakrajs@fgg.uni-lj.si 5Civil Engineer, FGG, Univ. of Ljubljana, Hajdrihova 28, 1000 Ljubljana, Slovenia. E-mail: mkrzyk@fgg.uni-lj.si 6Associate Professor, FGG, Univ. of Ljubljana, Hajdrihova 28, 1000 Ljubljana, Slovenia. E-mail: mmikos@fgg.uni-lj.si
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Abstract: | In November 2000 a landslide–debris flow with a volume of 1.2×106?m3 slid down from Sto?e Mountain in NW Slovenia. It partly or totally destroyed 23 buildings in the village of Log pod Mangartom and killed 7 people. As landslides of the same or even greater initial mass could endanger the village in the future, numerical simulations of these possible events were carried out. A hazard map of the area, and the most effective protection measures were determined in detail. A one-dimensional model DEBRIF1D, developed from a dam-break flow model, was used for simulations along the canyon in the upper part of the reach. Downstream, in the region of the village, two two-dimensional models were used: a newly developed PCFLOW2D, and a commercial model FLO-2D. The three models were calibrated by field measurements. A special feature of the DEBRIF1D model enables direct computation of the initial hydrograph. Validity of the quadratic equation expressing the resistance was roughly confirmed by field measurements, and a comparison of the accuracy and applicability of the three models is given. |
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Keywords: | Debris Solids flow Two-dimensional models Calibration Flow resistance Public safety Simulation Europe |
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