Author(s): Judy Joo Kheng Kueh, Sin Poh Lim
Linked Author(s): Kueh Judy
Keywords: One-dimensional (1-D), two-dimensional (2-D), flood, XP SWMM
Abstract: Flash flooding is the rapid flooding caused by the stormwater of intense rainfall associated with thunderstorms. Flash flooding in urban area has always been a nightmare as it can happen anytime and cause severe damage and sometimes can even lead to loss of lives. Flooding reveals the deficiencies in existing stormwater facilities and management practices. The development of effective design requires comprehensive understanding of flooding together with the stormwater infrastructure and system. Although one-dimensional (1-D) hydraulic modelling has been extensively used and proven to be useful for flood management but the capability is basically limited to water profiles and some hydraulic variables. For specific analyses such as overland flow in floodplains, determining direction and flood propagation rate, inundation extent, depths and duration requires a more sophisticated two-dimensional (2-D) modelling techniques. With the advent of geographic information system (GIS), digital terrain model (DTM), and advancement in hydraulic modelling software, 2-D modelling have begun to be adopted for analyses that require flood plain mapping and the analysis of overland flows. Besides, recent developments in flood modelling have led to the concept of coupled hydraulic model. With the availability of DTM for an urban drainage study, this paper illustrates the successful application of a coupled XP SWMM 1D and XP-2D model. The study is conducted for urban drainage along Jalan Sibiyu, Bintulu. Simulation results show that the coupled model is capable of providing crucial information such as direction and rate of flood propagation, flood inundation extent, flood depth as well as duration which in turn provides a better understanding of the actual flood behavior at the study area. The study illustrate that 2-D modelling results provide a better representation of the actual flood phenomenon to the designers in order to derive the optimum and cost-effective flood mitigation solutions
Year: 2017