Urban inundation simulation considering road network and building configurations

Abstract

The main difference between rural and urban area inundation is the existence of an impermeable layer and the complexity of the road and building configuration. Therefore, although surface overland flow can be appropriately simulated by the two‐dimensional diffusive model in a rural area, there also is a need for a more accurate and elaborate simulation model. Dual drainage concept has been popular to simulate urban drainage system. Although the concept has immense advantages, through which overland flow and pipe flow can be simulated simultaneously, many researchers set manholes as discharge exchange spots between ground surface and sewerage system, which causes lack of reality. Therefore, in this study, we developed a new urban inundation model that can reflect real field situation. Also, two kinds of simulations are carried out with homogeneous meshes and non‐homogeneous ones using manholes and storm drains as discharge exchange spots, respectively, and those results are compared to estimate the effect of road networks and building groups according to different discharge exchange spots. Two‐dimensional run‐off flow model and one‐dimensional slot‐model are used to simulate ground surface run‐off flow and sewer pipe flow. To connect both models, we used a newly suggested bi‐directional model and its coefficients. The simulated results showed that more reasonable results are obtained in the nonhomogeneous case; the results further reveal the importance of using storm drains as exchange spots in the model.

Effectiveness of Hydraulic and Hydrologic Parameters in Assessing Storm System Flooding

“…(1) e computed water stage (7.03 Q c /Q p ) is overestimated when the dynamic interaction between surcharge and discharge in manholes is neglected in the simulation [6]. ese equations (3)- (5) can also be used to estimate the volume of ooding, a new approach in this area of research.…”

“…e FACADE pattern is used in an object-oriented design to integrate storm flow and overland flow as well as implement an extensible integrated system for flood simulation in urban areas [6,7]. Urban flooding can be simulated by a two-dimensional flow model depending on ground elevation, land use, and type of soil; all these parameters have a large impact on the degree of surface runoff [5,8].…”

“…City flooding during heavy precipitation is considered a natural phenomenon [5,6]. e FACADE pattern is used in an object-oriented design to integrate storm flow and overland flow as well as implement an extensible integrated system for flood simulation in urban areas [6,7].…”

Field application studies of the effect of an underground storage chamber using an urban inundation model

“…Mesh elevation data were generated by a 5 m × 5 m digital elevation model, as shown in Figure . The elevations of meshes were adjusted to induce flows from building groups to roads artificially (Lee et al, ).…”

Runoff Behavior on Urban Road Intersection based on Flow Profile Simulation

“…Simulating homogeneous and non-homogeneous network types to estimate the effect of road networks, and building groups with the use of a two-dimensional runoff flow model and a one-dimensional slot-model, can be used to simulate ground surface runoff flow and sewer pipe flow, showing that a non-homogeneous case could calculate more reasonable results (Lee et al, 2016). Simulation in this study is performed with the use of a KINEROS-based hydrology model, using Geographical Information Systems (GIS) software.…”