Why are storms in Vietnam so good in Central Vietnam?

People have the phrase "Mr. tha that she did not forgive / Do flood two or three months in October" , to remind and warn the flood season in the provinces from Thanh Hoa to happen often in early July to October every year. So why is it always Central, what is the cause of big storms?

According to a special study on Central storms, there are many causes from subjective and objective, leading to the central gut to become the center of unprecedented storms in history.

Big storms originate from geographical causes

Typhoons form in the tropics because this natural phenomenon requires a very hot stream of water, at least 26 degrees at least 50 meters deep. Storms often form near the equator and tend to go to the two poles of the earth, the farther away from the velocity, the less near the equator is less affected by storms.

The storm is essentially a "heat sink" for the ocean. Most storms often follow the edge of high pressure and are attracted to low pressure areas. In our country, the most energetic months of sea water (July, July, and August) are often located in the middle of the Central region, so the storm often follows that route.

Satellite photo of a storm.

In other words, the Central is a place with severe weather when suffering from the southwestern wind. This wind carries a lot of moisture (because it passes through the Indian Ocean), so it often causes rain. Because of the wind, the storm formed in the South China Sea will be pushed up by the wind to the north. The more the wind is coming, the weaker the wind, so the storm tends to shift gradually to the Central.

Every year, northeast storms and monsoon winds often cause heavy rains in the central region. Moreover, weather changes around the world such as El Nino and La Nina waters also make storms and heavy rains more severe.

The rainy season usually lasts from July to November, with an average of 5-8 storms a year.

The rainy season usually lasts from July to November, with an average of 5-8 storms a year. In the years 2006 to 2017, the Central region was affected by 7 big storms, many tropical depressions and dozens of Northeast monsoon winds. These sea storms and tropical depressions often come from regional countries such as the Philippines, China . After 3 or 4 days of moving, it reaches the coast of our country.

Rainstorms in the upstream regions as well as in the plains cause widespread flooding

Compared to the South and the North, the Central economy is quite underdeveloped. Central people are familiar with the scene of 'July the water jumps to the shore' because of 'Heavenly flooding every year'.

The central coast is 1200 km long and consists of provinces from Thanh Hoa to Binh Thuan. The Truong Son range runs along the coast, so the plains in the Central region are very limited. It also has a large system of rivers and canals with large scale such as Song Gianh in Quang Binh, Thach Han River in Quang Tri, Song Huong in Hue-Thua Thien, Thu Bon River in Quang Nam, Song Tra Khuc in Quang Ngai,.

The estuaries are often filled with sediments to hinder flood drainage for the delta.

Rivers and streams are abundant, but the length of rivers is mostly short and has a steep slope. River basins are often hilly, so rain falls quickly. The estuaries are often filled with sediments to hinder flood drainage for the delta.

In addition, floods have caused great damage to houses, crops, bridges and roads, making it difficult for the central gut to become more difficult. Within a vicious cycle of storms and floods, economic development here has many disadvantages.

So why do floods cause serious damage?

Despite the authorities at all levels, the people actively prevented, coped and remedied the damage caused by storms and floods, but the consequences that it left were still very heavy.The first reason is due to continuous heavy flooding that occurs on a large scale and lasts for many days.

In addition to the main causes of storms in the upstream as well as in the delta, there are many reasons often mentioned as deforestation, sand and gravel exploitation and dam dyke systems.

Floods caused heavy damage to people's lives.

Studies and surveys in the United States and elsewhere in the world have proven that the leading cause of flooding is that too much rain occurs in a short time. Meanwhile, deforestation can directly affect the occurrence of floods in narrow basins such as in the Central region. Because plants have the ability to hold water as well as minimize landslides. When the forest is cut down, a bare land will cause the water and rock to be swept away, the water level in the downstream areas will increase.

The exploitation of sand and gravel in rivers also increases flood levels. This situation has caused serious erosion of river sections. The collapse of river banks as well as the filling of estuaries impede flood drainage and make flooding bigger and longer.

Unlike the Red River in the North and the Mekong River in the South, the rivers in the Central region do not have flood protection dikes . In addition, there are no large reservoirs in the upstream area to reduce flooding in the delta. So densely populated areas on both sides of the river always face the risk of flooding when there are heavy storms.

In short, the main cause of flood and storm in the Central region is due to storms formed from the East Sea and Northeast monsoon based on the weather conditions in the Central region which are very suitable to form the path of eye movement. So the central provinces became victims of heavy natural disasters. Other causes such as deforestation . only make floods worse.

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