Author(s): Dong Hwi Kim; Eun Taek Shin; Sung Won Park; Chang Geun Song
Linked Author(s): Chang Geun Song, Euntaek Shin
Keywords: Rainwater Storage Drainage Tunnel 1D Supercritical and Pressurized Flow Urban Flooding
Abstract: With the increasing frequency of extreme rainfall events, the risk of urban flooding has intensified, emphasizing the need for large-scale Rainwater Storage and Drainage Tunnels. However, in these tunnels, which accommodate large volumes of stormwater, frequent transitions between free-surface and pressurized flows during heavy rainfall events result in complex hydraulic flow characteristics that pose various engineering challenges. This study investigates and analyzes several supercritical flow analysis approaches -- including the Preissmann Slot model, the Two-Component Pressure Approach model, and the Artificial Compressibility model -- to accurately evaluate these complex flow phenomena. As a result, the optimal technique for analyzing flow characteristics in Rainwater Storage and Drainage Tunnels was selected, and a one-dimensional supercritical flow model was developed and validated through application to an idealized example to assess its effectiveness.
Year: 2025