| Numerical simulations were conducted to estimate the inundation area at the area where sediment deposition takes place actively. Two different conditions were configured as the rigid bed condition; simulating only flood flow, as well as erodible bed condition; simulating flood flow with bed variation. The inundation processes were discussed in terms of effects of flood discharge, river bed evolution, and sediment supply conditions at the upstream boundary. The results obtained from numerical computations show that the inundation areas computed with erodible bed condition are much larger than those predicted with rigid bed condition, and increasing of sediment supply from upstream significantly contribute to the increasing of inundation area. These results were validated partly with Modified Land Surface Water Index (MLSWI), which was obtained from satellite information, and indicate the importance of river bed evolution to the inundation processes. |
