On September 23, 2021, Hangzhou City, Zhejiang Province, after the Mid-Autumn Festival on the Qiantang River ushered in a tide, and the "first-line tide" of the Qiantang River is coming as scheduled.

Where the Qiantang River estuary is straight and there is no sandbar, the tide head is relatively neat, forming a line, called the first-line tide.

In the open section of the river section, some shallows often appear in the middle of the river, but the riverbed elevation is still low, and the tide head can cross the shallows. Due to the different resistance of the riverbed during travel, the forward speed may be faster or slower, forming a tidal stream of different shapes.

Image source: ICphoto

Release time: 2021-09-24 07:52:31 【Editor: Wang Yi】