Author(s): Jun Oh Oh; Sang Mi Jun; Jong Jin Lee; Chang Keun Park

Linked Author(s): Jun Oh Oh

Keywords: Drop shaft; Hydraulic stability; Deep storage and drainage tunnel system

Abstract: The deep storage and drainage tunnel system is a large-scale urban flood-exclusion facility installed underground to reinforce the insufficient drainage network capability of the metropolitan city, and is a facility in the form of a inverted siphon pipeline. "Shinwol rainwater storage & drainage system" such as inverted siphon has many hydraulic instability problems by inlet air. The "Shinwol rainwater and drainage system" constructing in Gangseo-gu and Yangcheon-gu, Seoul, South Korea, is the first flood control structure in Korea using a deep storage and drainage tunnel system. In this study, hydraulic model experiments were carried out to evaluate the hydraulic stability of the deep storage and drainage tunnel system for variable flood inflow. In this study, to evaluated to overflow or non-overflow at drop shafts and to analyzed overflow type at overflow occurred scenarios. Experiments formed for 55 scenarios, of which 19 scenarios occurred overflow. Undualr bore generated downstream pushes out the pressurized air collected in the facility while moving upstream. In the process, an explosion phenomenon of pressurized air occurs. In addition, after the pressurized air in the pipe is discharged, the phenomenon of stable flood inflow and exhaust occurs, and the facility becomes hydraulic stable.

DOI: https://doi.org/10.3850/IAHR-39WC252171192022572

Year: 2022