The downward rush is halted when the water table is reached. Here the slow-flowing river carves tunnels with a more rounded profile.
水流到达地下水位后便停止下流。这里缓缓流动的河流切割出一条圆形隧道。
3
By analysis of the morphological process in longitudinal profile, cross section and river pattern, the law of river course evolution at Yellow river estuary was summarized.