Two-Dimensional Flood Inundation Modeling in the Godavari River Basin, India—Insights on Model Output Uncertainty

Most flood inundation models do not come with an uncertainty analysis component chiefly because of the complexity associated model calibration. Additionally, fact that are both data- and compute-intensive, since results from multiple sources, adds another layer for use. In present study, modeling was performed in Godavari River Basin using Hydrologic Engineering Center—River Analysis System 2D (HEC-RAS 2D) model. The simulations were generated six different scenarios resulted combinations geometric, hydraulic hydrologic conditions. Thus, account sources uncertainty. SRTM-30 m MERIT-90 Digital elevation Model (DEM), two sets Manning’s roughness coefficient (Manning’s n) observed estimated boundary conditions, used to reflect uncertainties, respectively. HEC-RAS ran unsteady state mode abovementioned selected three events years, i.e., 1986, 2005 2015. water surface (H) compared all as well values at locations. addition, ‘H’ analyzed structures computational average correlation (r) between simulated H is greater than 0.85, highest r, 0.95, combination DEM optimized (obtained via trial error) n. shows river geometry information, highlight varying role conditions estimates. addition abovementioned, study recommends a systematic calibration junction understand hydrodynamics upstream downstream junction.