Abstract
In this study, a two-dimensional, finite volume hydrodynamic model is applied to simulate large scale floods that accounts for high resolution bathymetry and roughness data. This approach presents sub-grid based model, water level and velocity are computed using a coarse grid as these parameters doesn't need high resolution. On the other hand, finer grid considers roughness and bathymetric variations using high resolution data because they are vary over short distances. A wetting and drying algorithm is implemented in our model in order to correct the mass balance in wet areas as well as in the region of transition from wet to dry and from dry to wet. In order to check the model capabilities, two major floods in Pakistan and Thailand have been simulated. The numerical results are then compared with satellite images, and numerical results obtained from Nays 2D Flood (iRIC). The results obtained from these comparisons show that our model is capable to simulate large scale flood quickly and accurately.
