抄録
Flood flows analysis in the Hikosan river basin in July 2012 were performed by numerical models for the 2D unsteady free-surface flow based on HLLC(Harten-Lax-van Leer and Contact). A new procedure for a dry/wet boundary over a topography is incorporated into the model based on HLLC solver. The HLLC model was verified against the observed water level. The computation accuracy and speed were compared between HLLC model and FDS(Flux-Difference Splitting) model. It shows that (1) the HLLC model reproduce the behavior of flood flows with reasonable accuracy, and that (2) the calculation efficiency is high compared with FDS model, and that (3) the treatment of a dry/wet boundary needs to be improved for the HLLC model to conserve the mass.
