Sensitivity analysis in flood modeling of flat areas

Abstract

The study of flooded areas is derived from detailed knowledge of the area under consideration (river and floodplain), hydrological analysis and hydraulic modeling. The estimated risk of flooding is now facilitated by survey systems able to create enable the creation of highly detailed digital terrain models (COBBY et alii, 2001), by complex mathematical models and sophisticated hardware and software which permit the achievement of complex elaborations within satisfactory time periods. However, the construction of the simulation model is always a compromise between the capability of the instruments and the detail that you want to achieve. So it can be useful to verify the extent of changes in hydraulic parameters of output compared to the choices made on the input parameters This is especially true when observed data of flood events are absent. Considering an extremely flat area, this work aims to analyze the results of hydrodynamic bidimentional simulations depending on the detail achieved in the characterization of the study area (expressed through the computational domain resolution) and the floodplain roughness.