Abstract
: This study presents the numerical simulation and analysis of the characteristics of the flood inundation in a small-scale coastal urban area due to the intense rainfall and poor inner drainage from the tidal level rise occurring during a typhoon. The employed numerical model is a two-dimensional finite volume model with a well-balanced HLLC (Harten–Lax–Van Leer contact) scheme. The target area is a coastal urban area downstream of the Gohyun river; which is located in Geoje City of Kyungsangnam Province, Korea. This area was significantly damaged by flood inundation due to the heavy rainfall and significant increase in the tidal level during Typhoon “Maemi”, which occurred in September 2003. The numerical model used in this study is verified using the flood inundation traces observed in the selected urban area. Moreover; the characteristics of the flood inundation based on the change in the river inflow due to the increase or decrease in the intensity of the possible heavy rainfall that may occur in the future are simulated and analyzed.
Highlights
In recent years, natural disasters caused by typhoons and localized heavy rainfall resulting from environmental disruption and global warming have frequently occurred worldwide, and the scale of the resulting damage has been increasing
The numerical model employed is a two-dimensional finite volume model method with a well-balanced Harten–Lax–Van Leer contact (HLLC) technique [21]. This numerical model is verified by the comparison of the propagation patterns of the flood waves that occurred in urban areas when the protected lowlands around the downstream of the Gohyun river were flooded
HEC-HMS has become very representing buildings in the terrain [37]: (1) building-hole models, where the buildings are replaced popular and been adopted in many hydrological studies because of its ability in the simulation of runoff with building-perimeter polyline [9], and either a free-slip boundary [38] or other internal hydraulic both in short- and long-term events, its simplicity to operate, and use of common methods [34]. In this conditions are imposed along the perimeter, (2) building-resistance models, where a relatively large study, the Soil Conservation Service curve number (SCS-CN), Clark unit hydrograph, and Muskingum resistance parameter is assigned to cells corresponding to building footprints [39]
Summary
Natural disasters caused by typhoons and localized heavy rainfall resulting from environmental disruption and global warming have frequently occurred worldwide, and the scale of the resulting damage has been increasing. Enormous human and property damage due to floods has been occurring in urban areas with dense populations and assets The causes of this phenomenon include the increase in the impervious areas owing to urban development and vulnerable flood prevention facilities and the increase in localized heavy rainfalls resulting from abnormal climates [3]. The numerical model employed is a two-dimensional finite volume model method with a well-balanced Harten–Lax–Van Leer contact (HLLC) technique [21] This numerical model is verified by the comparison of the propagation patterns of the flood waves that occurred in urban areas when the protected lowlands around the downstream of the Gohyun river were flooded. Two-Dimensional Finite Volume Model with Well-Balanced Harten–Lax–Van Leer Contact (HLLC) Algorithm
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