Thua Thien Hue coast is heavily landslide

On average, each year the coast of Thua Thien-Hue falls from 15-20m. However, up to now, there have been no effective measures to prevent it.

The total length of the coast of Thua Thien-Hue province is over 120km, there are 34km of heavy landslides, every year, people have to move to new places - according to the Branch of Flood and Storm Control and Dyke Management of Thua Thien-Hue .

The sea is advancing and people are backing up

At present, localities are facing the most severe state of seawater intrusion including: Thuan An, Phu Thuan, Phu Dien, Phu Hai (Phu Vang), Quang Cong - Quang Ngan (Quang Dien) , Hai Duong (Huong Tra town), Vinh Hien, Vinh Hai (Phu Loc), Phong Hai (Phong Dien).

Particularly in 2011, Thuan An estuary is a hot spot when seawater is eaten deep inland nearly 50m. In Hai Tien village (Thuan An), An Duong, Phu Thuan, the coast is eroded more than 30m. Particularly in Thai Duong Ha Nam village (Hai Duong) in the north of Thuan An seaport, the coast is nearly 50m eroded and stretches over 500m. The 20-year-old protective forest here is gradually being wiped out, threatening the lives of hundreds of households. Mr. Phan Hanh (Thai Duong Ha Nam Village, Hai Duong) worried: 'A few years ago my house was more than 100 meters from the coast, but now the sea is close to the yard. I was almost moved around the house, probably my turn. '

Hundreds of houses in Phu Thuan were destroyed by sea water. (Photo: Duc Quang)

Facing that situation, the localities could only move people to a safe place. Mr. Nguyen Liem, Chairman of Hai Duong People's Committee said: 'In the past, the commune has conducted 2 relocation cycles with 191 households to resettlement areas. In the first phase of 1999, 56 households were relocated and 135 households were removed in the second phase of 2000-2001. Currently planning is 1.6 ha to prepare for relocation of phase 3 '.

Similarly, in 2011 in Hai Tien hamlet (Thuan An town), 15 households had to relocate to resettlement. In Phu Thuan, last year also had to relocate 17 households urgently. Mr. Nguyen Van Chuong, Chairman of People's Committee of Phu Thuan commune said: 'There are still 35 households in An Duong village who are subject to urgent relocation. The commune also prepared 20 plots of land in resettlement areas, ready to relocate people when the sea water is deepened to the mainland '.

Frantically looking for measures

Thua Thien-Hue has a coastline of more than 120km but has yet to have a system of dykes and embankments to prevent landslides. Particularly in Thuan An estuary, there have been 4 stone welding mines built so far, most of them have been destroyed by seawater. Meanwhile, to prevent landslides, people only know how to use sand bags to build dikes but quickly drift to the sea.

According to Mr. Tran Duc Duy, deputy head of the Department of Flood and Storm Control and Dyke Management, Thua Thien-Hue said: 'Currently there are many measures to quickly erode the coast, mainly' hard welding and soft welding mines'. ' . But it is not easy to build a dyke system to prevent landslides. When there is a construction project, it is necessary to study the sea currents, the flow rate, the wind direction . For Thua Thien-Hue, the weather is quite complicated, making it more difficult to build.

In August 2007, in Phu Thuan, a soft groin, called Stabinplage constructed for erosion and coastal invasion by Espace Pur (France), was put into testing at a cost of nearly VND 30 billion. copper. But only one year was destroyed by the waves. By July 2010, the newly completed 6 Stabinplage is currently being tracked.

Stabinplage technology, also known as sand shield eel. Each eel has a length of 50m perpendicular to the coast, about 1.5 m high, in the eel pumped with sand. The structure consists of two parts, the outer shell has two layers made of polyester and polypropylene material, the inner shell is made of polypropylene. The distance between two eels ranges from 20-30m, the effect of preventing the waves from hitting the shore, not letting the waves follow the waves. However, all materials are imported from France, so it is difficult to apply massively. Warranty repair is also complicated when Espace Pur office is closed forever in Ho Chi Minh City.

According to Mr. Tran Duc Duy: 'At the Thuan An estuary, if we build a concrete wall, the foot of the deep foundation is sure to have a long-term effect, but the budget is very large.' However, Mr. Do Nam, Chairman of Union of Science and Technology Associations, Thua Thien-Hue, said: 'To know which method is most optimal, it must be tested, but many experimental projects have no reports. result. Therefore it is difficult to determine which measures are appropriate and long-term effective. In the world to prevent landslides often use stone soldering. The important thing when building must be very deep nails, not wide. '