These inclined beddings can be divided into 4 bedding assemblages to represent different development stages of tidal sand ridges and to correspond to different postglacial sea-level rise periods.
The strengthening of the tidal power caused by the significant topographic change is responsible for the rise of the low water levels in the tidal reach.
而河床地形变化引起的三角洲河网区潮汐动力增强，则是感潮河段低水位上升的主要原因。
3
Numerical modeling of the changes of tidal amplitude and phase due to the MSL rise was made by the use of tidal basic equations in rectangular bays with mouths open to the south and tortuous bays.