Abstract
By using data of hourly rainfall with all of the meteorological stations in the upper reaches of Hunhe River (Qingyuan Section), the digital elevation model, the land use and the disasters data etc., the storm flood process which happened on 16 August 2013 is reproduced simulated based on the rainstorm flooding of FloodArea model, also the flooding simulation and its effectiveness have been carried out. Conclusions are drawn as follows: there is a sharp rise of the flood depth falling behind the change of rainfall three or four hours. As the accumulation of the precipitation, the water level has increased, and when the precipitation process stops, the flood pooled into midstream and downstream gradually. According to the disaster investigation, in both the aspects of flooding scope and flooding depth of warning spots, the simulation result of FloodArea model agrees with the fact. It indicates that the FloodArea model generates good simulation effect in the upper reaches of Hunhe River (Qingyuan Section). Combined with population and GDP information, in the whole river, about eighty-three thousand people were affected by flooding, also one billion and five hundred seventy five million RMB of gross domestic product was lost. When the flood depth deepens and the flooding scope increases, correspondingly the loss rate of population and GDP rises and the flood risk increases.
Highlights
By using data of hourly rainfall with all of the meteorological stations in the upper reaches of Hunhe River (Qingyuan Section), the digital elevation model, the land use and the disasters data etc., the storm flood process which happened on 16 August 2013 is reproduced simulated based on the rainstorm flooding of FloodArea model, the flooding simulation and its effectiveness have been carried out
It indicates that the FloodArea model generates good simulation effect in the upper reaches of Hunhe River (Qingyuan Section)
The determination of flood inundation range and depth is the core of storm flood risk assessment
Summary
Li Lan et al [5] based on the analysis of historical flood risk in Zhanghe River Basin flood cases, the use of GIS-based storm flood flooding model to calculate the different periods of recurrence of surface submergence of rainfall and water depth; Xie et al [6] used FloodArea model to simulate storm flood and flood caused by a typical heavy rainfall process in the Datong River Basin and carried out risk assessment. Wang Sheng et al [7] carried out flood inundation simulation in the Bahe River Basin, superimposed disaster-bearing body information, and obtained risk assessment and zoning map of flood inundation period in different recurrence periods. These researches are of great significance for risk assessment and analysis of storm flood disaster. The peak flow and water level of the hydrological stations in the north of the mouth reached the actual measured values since the founding of New China The first one is located in the south front of the rainstorm center town, on the 16th daily precipitation as high as 449.0 mm [10]
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