複断面蛇行流れに及ぼす堤防と低水路の蛇行度と位相差の影響

抄録

It is difficult to estimate the effect of the phase difference between meandering levee and main channel on the flow, because plan form of rivers are irregular and complex. To investigate the effect of the phase difference on flood flow, we have conducted experiments using meandering compound channels with various phase differences and sinuositis.
In the case that the levee goes ahead of the main channel, dead water area appeared on the flood plain, consequently the main flow region become narrow, increasing the quantity of flow in the main channel. In the other hand, for the case in which the phase levee goes behind the main channel, the dead water phenomena did not appear, therefore the flow in the main channel suffered a relative decrease. Even when the phase difference of levee and main channel changed continuously along the channel, the features of flow remained the same as those cases stated earlier.