自由表面・圧力流れのダイナミックネットワークモデルの構築と都市域下水道網への適用

抄録

Dynamic network model for free-surface-pressurized flows was constructed. The model was based on flux­ difference splitting scheme combined with the Preissmann slot to simulate flows in a closed conduit wherein the flow may change from free-surface to pressurized flow and vice-versa. The model was verified against available experimental data on free-surface or free-surface-pressurized flow. Thereafter, the model was tested against some exacting sample problems. It is demonstrated that the model yields very reasonable results in all the cases considered. The simulation of water movement in the sewer network in the Iizuka-city area, which suffered the greatest damage in the Onga basin, was conducted to examine the modelʼs applicability to sewer network in the urban area.