Venice, a water city, is seriously short of water. Why?

Since 1 month and March, a warm high pressure has controlled the whole of Italy, which is prone to low water level.

Second, February in Venice is the month with the least precipitation in the whole year.

Third, Venice is near the sea, and the water level is greatly affected by tides.

Gondola ship? Ran aground. (Source: People's Vision/Copyright picture from vision china)

First of all, judging from the weather, since March, a huge warm high pressure has controlled the whole of Italy, and under the influence of high pressure, it is easy to have a low water level.

On the map of the upper air pressure field in Europe, the red circle is marked as the high pressure control area. (Source: European Center)

It is reported that the current average water level of inland rivers in Venice is-0.35 meters above sea level, which is in great contrast with the water level during the flood last year.

Two years ago, at 20 19, 1 1 month, Venice was hit by floods, and the highest water level reached 1.87 meters, setting a record for the highest water level in 53 years. The government declared a state of emergency in Venice. Many churches, shops and museums in Venice have been flooded, so people need to build wooden bridges to walk in the city squares. In order to cope with this situation, the Italian government built a lake in Venice, and the east of the lake is connected with the Adriatic Sea? Floating dam? , known as? Moses plan? . Its gate passed the general test in July, 2020, and it has played a blocking role many times? High water level? Invasion.

However, at the end of February this year, the water level in the inner city of Venice was once 50 cm below sea level, and the riverbeds of the rivers in the city were exposed, so many gondola ships were forced to stop sailing. Ansa reported that the last time Venice suffered a severe low water level was at the end of February 2065438+2008, and the water level was 66 cm below sea level.

In recent years? Shuicheng? It can be said that the flood continues. 20 19 10,19 Venice was hit by floods, and the highest water level reached 1.87 meters, setting a record for the highest water level in 53 years. The government declared a state of emergency in Venice. Many churches, shops and museums in Venice have been flooded, so people need to build wooden bridges to walk in the city squares. In order to cope with this situation, the Italian government built a lake in Venice, and the east of the lake is connected with the Adriatic Sea? Floating dam? , known as? Moses plan? . Its gate passed the general test in July, 2020, and it has played a blocking role many times? High water level? Invasion.

It is pointed out that Venice was built on the beach of Venice lagoon and connected with Adriatic Sea. Whenever there is strong wind and heavy rain, the Adriatic Sea will flow backwards; However, if there is a strong high pressure, the water level in the lagoon will drop. Analysis thinks this is it? Shuicheng? The main reason why water is so elusive.

In our impression, flood is the main threat to Venice, but in fact, drought often plagues this small town in winter. Hu Xiao said that nowadays, coastal cities often face alternating droughts and floods, which are closely related to human activities, climate change and changes in the marine environment. What is the theme of World Meteorological Day this year? Ocean, our climate and weather? It is the responsibility of each of us to care about ocean changes, raise environmental awareness and put it into practice.