Evaluation of flooding impact with FRI by considering refined model and LID
Journal
River Flow - Proceedings of the 12th International Conference on Fluvial Hydraulics
Part Of
River Flow - Proceedings of the 12th International Conference on Fluvial Hydraulics
Start Page
1035
End Page
1042
Date Issued
2024-09-02
Author(s)
Liao Y.L.
Abstract
The expansion of urban areas and the occurrence of extreme weather events with short bursts of heavy rainfall have placed significant pressure on existing drainage systems. Low Impact Development (LID) has been demonstrated to be an effective method of mitigating the impacts of flooding in the area. LID represents the optimal solution to the problem of intermittent urban flooding. By modelling LID in conjunction with existing drainage systems, it is possible to reduce flood risk by reducing the peaks and flows in the catchment. The SWMM is employed to assess the peak flow, total runoff, and inundation of the LID strategy in the hydrological modelling of LID. However, there is a paucity of 2D slow-moving land and topography to comprehend the alterations in the flooding history of the area under rainfall events. Consequently, this study employs the 3Di model as an assessment tool for LID flood modelling, which is capable of capturing the high accuracy, temporal, spatial, elevation and slow-land flow characteristics to ensure the accuracy of the simulation. In this study, the LID simulation is carried out using the intermediate flow conjunctive surface (IFS) function in the 3Di model. The modified method of the IFS is verified to be closer to the experimental values of the total flow, the peak flow is closest to the experimental values, and the flood peak arrival time is delayed compared to the other two methods. This is in comparison with the previous intermediate flow method used in the 3Di, the SWMM, and the experiments. In this study, the LID method employed in 3Di was enhanced by incorporating the infiltration rate and pipelines, as derived from the validation results. Furthermore, the refinement of land use categories and the introduction of LID design criteria were considered to further enhance the precision of flood modelling. The optimised LID also enhances the accuracy of simulation and operational flexibility, thereby providing a more accurate assessment methodology for effective resource allocation during disaster response.
Event(s)
12th International Conference on Fluvial Hydraulics, River Flow 2024, Liverpool, 2 September 2024 through 6 September 2024. Code 330059
Type
conference paper