Shanghai hydrological recruitment

What is salt tide? Shanghai: Salt tide appears at the mouth of the Yangtze River. Salt tide? What kind of hydrological phenomenon is it?

1, event content

At the beginning of September, by? Xuanlannuo Meihua Nanmadu? Affected by the typhoon, northerly winds formed in offshore areas, and tumbling salt water flooded into the Yangtze River estuary, resulting in salt tides at the water intakes of Qingcaosha Reservoir and Chen Xing Reservoir. In the follow-up, the water department will pay close attention to the development trend of salt tide in the Yangtze River estuary, and will pass it if necessary? Choose the right time to replenish water, combine raw water with clean water, and switch standby water sources? And other measures to enhance the water supply guarantee capacity of the raw water system.

2、? Salt tide? What kind of hydrological phenomenon is it?

Salt tide (also known as the upper reaches of salt tide and salt water intrusion) is a natural hydrological phenomenon, which is caused by the attraction of the sun and the moon (mainly the moon) to the surface seawater. When the flow of Danshui River is insufficient, seawater flows backwards, and the mixing of salt and fresh water leads to the salinization of the upstream water body, that is, the salt tide is formed. Salt tides generally occur in winter or dry season, that is, from 10 to March of the following year, at the intersection of rivers and seas, such as the Yangtze River Delta and the Pearl River Delta.

3. The influence of salt tide on life

Dongjiang appears because seawater flows backwards into the river at high tide? Salt tide? Phenomenon, affecting the water safety of 50 million people in Dongjiang water receiving area. As for why people feel that water has changed after drinking it? Is it salty? Is it because the situation is grim? Salt tide? Surrounded, the water flow slows down, leading to the increase of chloride concentration in water in individual periods. Compared with the usual low chloride, drinking water will have a salty taste.

Postscript: At present, the sluice center in Pudong New Area pays close attention to the change of salt tide. If it is found that the salt tide is further aggravated and the sluice along the Yangtze River estuary continues to be unable to divide water, will it be considered? Draw water from west to east? In the mode of water transfer, when the sluices along the Yangtze River estuary, such as No.5 ditch and Sanjia port, cannot be diverted, Yang Si, Yang Jing, Xigou and other Huangpu River estuaries will be dispatched for water transfer to ensure the safety and stability of the river water environment in the new area.