Qian Jiangchao Genesis
Time: from August 16 to August 18 of the lunar calendar, the sun, the moon and the earth are almost in a straight line, so the tidal attraction of that day (the difference between the gravity of the moon, the sun or other celestial bodies on the earth and the gravity of the earth's center of mass, or the resultant force of the inertial centrifugal force generated by the earth's movement around the center of mass of the moon (sun) and the moon (sun)). ) the biggest.
Geographical location: It is related to the trumpet-shaped estuary of Qiantang River. Nearly 500,000 mu of reclaimed land east of Zheshan Mountain on the south bank of Qiantang River blocked the estuary like a peninsula, making Zheshan Mountain of Qiantang River extend ten miles outward.
explanatory drawing
The second paragraph resembles a bottle with a big belly and a small mouth, and the tide is easy to enter but difficult to retreat. The outer mouth of Hangzhou Bay is 100 km wide, and the outer 12 section is only a few kilometers wide. The riverbed in the eastern part of the estuary suddenly rises and the beach is shallow. When a large number of tides poured in from the mouth of Qiantang River, because the river surface contracted rapidly, the tides could not rise evenly, so they had to push the waves forward and overlap each other. Secondly, it is related to excessive sediment deposition under the Qiantang River. Sediment deposition blocks and rubs the tidal current, which makes the front slope of the tidal current steep and gentle, thus forming a wave after catching up with the previous wave, and one wave overlaps with the other.
Wind direction: the southeast wind is often blown along the coast, and the wind direction is generally consistent with the tidal direction, which is helpful for the tidal direction.
Qiantang special snacks
Cross tide
Qiantang river tidal bore
55 kilometers away from Hangzhou Bay, there is a place called Daguan, which is an excellent place to watch the tide. Due to the long-term deposition of sediment, 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 tidal heads crossed and embraced like two brothers, forming a varied and spectacular cross tide, showing a spectacular scene of "thunder gathering on the sea and waterfalls crossing the river". 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, causing huge splash and landing on the top of the pond, scaring tide watchers to scream and avoid.
Yixianchao
Qiantang river tidal bore
After seeing the tide crossing in the Great Gorge, I suggest you drive to Yan Guan as soon as possible and wait for the first tide. No tide shadow, smell the tide first. There was a loud noise in my ear, and the river remained calm. The noise is getting louder and louder, like drumming on all sides, which is deafening. In the distance, a white line appeared on the foggy river, which moved rapidly to the west, just like "Pingchuan crossing the river, Changpingsha starting from Bai Hong". Closer, the white line becomes a water retaining wall and gradually rises. "If you want to know how high the tide is, you must cross the mountains and waves first." With the rapid advance of a white wall, the tidal bore came to our eyes. With the trend of Ma Benteng, the power of thunder was unstoppable.
The first-line tide is not unique to salt officials. Where the river is straight and there is no sand, the tides are all on the same line, but it is not as good as the salt official. The reason is that the position of Yan Guan not far from the upstream and the width of the river channel shrink sharply, and the east and south tides just meet in a straight line, and the tidal level energy is concentrated, and the tidal range is particularly large, usually 1-2 meters, sometimes reaching more than 3 meters. Magnificent and spectacular tidal scene.
Huitouchao
Qiantang river tidal bore
The tide in the upper reaches of Yanguan will reach the next tidal spot, Laoyancang. The geographical environment of the old salt warehouse is different from that of Yan Guan, where the river is straight and the tidal bore advances westward without any obstacles. For the purpose of reclamation and seawall protection, a 660-meter-long groin was built on the river course of the old salt warehouse. After encountering obstacles, the roaring tide will be reflected back, where it will violently hit the opposite dam, and then turn back with the tide of Mount Tai and fall on the rapids moving westward, forming a row of "snow mountains".
The spring tide of Qiantang River is magnificent during the day and poetic at night. Watching the tide is a kind of enjoyment, and listening to the tide is a daydream. No wonder some people say that "the Qiantang national ceremony is not enough to see the hipsters until they are bald."
Midnight tide
At midnight, there was a faint rustle on the river and the tide was rising. On the foggy water, there is a piece of melanin floating intermittently. After a while, the sound suddenly increased, and the tide came with a thunderous thunder, smashing the moonlight of the whole river into silver. The tide pushes, tears and spits down the pond like thousands of gray-maned horses, especially like Enemy at the Gates, a hundred thousand troops. Wave guidance before tidal bore
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. At this time, many tourists threw bonfires and reed flowers into the river to express their good wishes with Percy. ...
The best place to watch the midnight tide of 100,000 troops is in the area of Tianfeng Haitao Pavilion, which is the scene of "enjoying the moon in the wind". Its romantic and unique mood attracts a large number of tourists. Su Dongpo, a poet in the Northern Song Dynasty, also wrote such a poem: "I know that the Jade Rabbit is round, and it has been frosted in September; The message is to close the door and turn off the key, so that you can see it in the night tide and the moon with an expression.