Author(s): Wei Zhang; Xuan Wan; Peizhen Qu; Zimeng Zhuang; Junqi Li

Linked Author(s): Wei Zhang

Keywords: 1D/2D coupled modeling; Rapid identification; Risk analysis; Urban flooding

Abstract: Urban flooding risk identification is one of prerequisites for urban flooding control, and 1D/2D coupled modeling provide an alternative approach. Based on the classic hydraulics method, the hydraulic performance of the sewer in the drainage sewer system was analyzed, and the main influencing factors of sewer hydraulic surcharge and manhole overflow were clarified and quantified. In this study, a quick identification method of manhole overflow based on the diameter and slope of upstream and downstream sewer of manhole was proposed, which can provide a feasible method for the rapid identification of urban flooding. The case verification under a variety of scenarios show that the recognition accuracy of the method was higher than 75% under the design rainfall conditions. Moreover, the coupling method of one-dimensional sewer model and two-dimensional surface overflow model based on manhole and inlet as coupling nodes was explored. Through laboratory experiments, the key parameter values of the two coupling modes were proposed. Furthermore, generalized processing methods for key elements in two-dimensional surface overflow models was analyzed, including buildings, roads and community fences.

DOI: https://doi.org/10.3850/iahr-hic2483430201-115

Year: 2024