Inundation Simulation of Underground Space using Critical Dry Depth Scheme

Title & Authors
Inundation Simulation of Underground Space using Critical Dry Depth Scheme
Rhee, Dong Sop; Kim, Hyung-Jun; Song, Chang Geun;

Abstract
In this study, a 2D hydrodynamic model equipped with critical dry depth scheme was developed to reproduce the flow over staircase. The channel geometry of hydraulic experiment conducted by Ishigaki et al. was generated in the computational space, and the developed model was validated against flow properties such as discharge, velocity and momentum. In addition, the water surface profile and the velocity distribution evolved in flow over two layers staircases were analyzed. When the initial water depth at the upper floor was 0.3 m, the maximum velocity at lower floor was 4.2 m/s, and the maximum momentum was $\small{1.2m^3/s^2}$, and its conversion to force per unit width was 1.2 kN/m. This value was equivalent to the hydrostatic force with 50 cm water depth, and evacuation became difficult, as proposed by Ishigaki et al. For the flow over staircases connecting two layers, the maximum run-up height in flat part connecting two layers was approximately two times higher than the initial water depth in upper floor, and the rapid shock wave with sharp front and long tail was propagated.
Keywords
flow over staircase;2D hydrodynamic model;critical dry depth;evacuation;
Language
Korean
Cited by
1.
Numerical Computation of Underground Inundation in Multiple Layers Using the Adaptive Transfer Method, Water, 2018, 10, 1, 85
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