Title: The use of geostationary satellite based rainfall estimation and rainfall-runoff modelling for regional flash flood assessment
Abstract: Flash floods are considered as convective rainfall triggered event that producing the most fatalities (Doswell, 1996). The early warning system has been being developed for improving preparedness for the catchments that prone to flash floods. The recent efforts include the use of flash flood warning based on rainfall threshold and soil moisture condition (Norbiato et al., 2008), and the use of ensemble hydro-meteorological simulation (Alfieri et al., 2012). Other researchers are trying to develop a method to provide more preventive flash flood information by assessing the area that vulnerable to flash flood (Yousef et al., 2010, Kim and Choi, 2011). This approach is mostly suitable in term of infrastructure and land use planning. Flash flood is a flood that characterized by very rapid rising and falling with little or no advance warning (NRC, 2005). This type of flood differs with the “ordinary flood” since it occurred when the river receives more water than it can handle, causing inundation of normally dry area. The term “flash” is related to the rapid response to the causative event or rapid time to peak i.e. the time need for water level of the river to reach the crest. The definition of rapid response time is the varying among researcher, however the acceptable response time may be between maximum 6 up to 12 hours after the causative event (Geogarkakos, 1986; NRC, 2005). Flash flood may occur due to intense rainfall over a relatively small area or by the sudden release of water such as dam breach or glacier outburst. Nevertheless, this study only focuses on the flash flood caused by excessive rainfall in natural catchments. The availability of rainfall triggered hazard information such as flash flood is crucial in the flood disaster management and mitigation. However, providing that information is mainly hampered by the shortage of data because of the sparse, uneven or absence of the hydrometeorological observation. Remote sensing techniques that make frequent observations with continuous spatial coverage provide useful information for detecting the hydrometeorological phenomena such as rainfall and floods.
Publication Year: 2013
Publication Date: 2013-09-25
Language: en
Type: dissertation
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Cited By Count: 1
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