1 June1day, a rare cross tide appeared in the spring tide of Qiantang River, which was photographed by helicopter near Jiashao Bridge in Haining, Zhejiang Province. Cross tide? . ? Cross tide? It is formed because the tide flowing from west to east and upstream meets the sandbar at the bottom of the river and is divided into two tides in different directions.
Due to the asymmetric geographical location between the north and the south of the bell mouth of Hangzhou Bay, the coastline of the South China Sea protrudes eastward, and a large number of islands in its eastern waters reduce the sea area, which makes the astronomical tide spread faster in the southern section than in the northern section. After rapidly occupying the southern sea area, the coastline turned north, which was the later southern tide.
At this time, the tide in the northern section has been marching at a constant speed, falling far behind and unable to mix with it, so there are tides in two directions, of course, it is only a dark tide at this time. Although the northern tide was later influenced by the coastline of the North Sea, under this single factor, it can only keep the trend of increasing westward, which is the later eastern tide.
Until approaching Jiashao Bridge, astronomical tides gathered enough through the bell mouth of Hangzhou Bay, and finally formed a tidal bore, showing a varied and spectacular cross tide. Although the two tides collide, they are not mixed. The eastern tide is still the western tide and the southern tide is the northern tide. It was not until the south tide hit the north dike that the two tides merged into one tide and pushed upstream.
In Ding Qiao Town, Haining City, there is a place called Daguan, 55 kilometers away from Hangzhou Bay, which is an excellent place to watch the tide.
Due to long-term sediment deposition, a sandbar is formed in the river channel, which divides the tidal wave from Hangzhou Bay into two waves: the east tide and the south tide. After bypassing the sandbar, the two tides cross and embrace like two brothers, forming a changeable and spectacular cross tide, showing? Thunder on the sea, waterfall in the river? Spectacular scene.
At the moment when the two tides collided, a water column was stirred up, which was as high as several feet, splashing and stirring. By the time the water column fell back into the river, there were already two tidal heads on the river, which were cross-shaped and quickly ran west. At the same time, the intersection moved northward like an avalanche, hitting the straight seawall, splashing huge water and landing on the top of the pond.
Except Qiantang river tide? Cross tide? Outside, what else? A wave? 、? Low tide? 、? High tide? 、? Midnight tide? Wait a minute.
A wave? I didn't see the shadow of the tide, so I heard it first. With the rapid advance of a white wall, the tidal bore came to my eyes, with the potential of Ma Benteng, unstoppable.
Low tide? The tidal current from the upper reaches of Yan Guan will reach Xialao Salt Warehouse. A 660-meter-long groin will be built on the river course of Laoyan Warehouse. After encountering an obstacle, the roaring tide will be reflected and turned back, where it will violently hit the opposite dam, and then turn back with the trend of Mount Tai topping, and fall on the rapids moving westward, forming a row? Snow mountain? This is the tide coming back.
High tide? The Meiren Dam in Zheshan Mountain, Nanyang, will not only produce a tidal wave, but also produce? High tide? This is a special tide that occurs at the junction of dams. The tide is like being caught in a net. At the corner where the dam meets, the tide? Wow? There was a loud collision, and the tide went straight into the sky, raising a column of water, ranging from two or three meters low to more than ten meters high.
Midnight tide? At the high tide at midnight, a piece of melanin floats on the foggy water, and the tide comes with thunderous thunder, just like a hundred thousand troops in Enemy at the Gates. The front waves of tidal bore attract the back waves, and the back waves push the front waves, forming a pile of towering tidal peaks on the river surface, and the waves are as high as the sky, as if rushing to the bright moon for nine days.