Model parameter sensitivity analysis of 2D overland flow
MethodologyIn this study, sensitivity analysis of model parameters, namely infiltration rate (Ks), imperviousness, and Manning roughness coefficient (n), was performed to provide an understanding of the behaviour of key model parameters. This analysis does increase the confidence about the model performance and its predictions (Kleidorfer et al. 2009).Sensitivity analysis of the model parameters was undertaken for each considered parameter, varying its value between the selected ranges while keeping all the others unchanged. Three important parameters in the 2D overland flow model, including Ks, n, and imperviousness, were considered. These parameters were obtained by correlating their values with land use and soil type/texture information from previous studies (Aldridge and Garrett 1973;Chow 1964;Liu and De Smedt 2004;Plasschaert 2019).Six categories of land use were adapted to the study area. Two scenarios of model parameters (i.e. minimum and maximum values) for each parameter were examined in the flood model, as presented in Table 1.