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The scene where the landslide occurred buried dozens of people in Tra Leng Commune, Nam Tra My District, Quang Nam Province – Photo: THUY Ai
At the meeting Typhoon No. 10 response organized by the Central Steering Committee for Natural Disaster Prevention on November 2, Deputy Prime Minister Trinh Dinh Dung to mention The history of landslides in the central provinces caused serious damage and Information on social media said that “our landslide warning is poor, inexperienced.”
The Deputy Prime Minister asked the Ministry of Natural Resources and Environment to report on the investigation, mapping alerts and response to the landslides.
You must be meticulous and methodical.
Mr. Le Cong Thanh, Deputy Minister of Natural Resources and Environment, said that during the last natural disaster in the Central region, the landslide was very complicated.
“Experience in the world, the regions with terrain and geological structure similar to Vietnam are Korea, Japan and China, which often occur landslides and cause serious damage. Landslides require meticulous and methodical work. Therefore, it should be based on a topographic and geological evaluation investigation of each area, from which to produce an erosion risk map.
From this map, we will know that this commune, that district has failure points, there are geological structures in which, when triggering factors, landslides can occur. However, when floods occur, it is difficult to predict where they will slide.
In a country with high technology for the prevention of natural disasters like Japan, in 2017, there was also a large landslide, which went beyond all previous calculations and caused great damage, “Thanh said.
According to Mr. Thanh, the specialized agency of the Ministry of Natural Resources and Environment will continue to map the risk of landslides based on the topography and geological structure in more detail and detail.
Currently, the Vietnam Institute of Geosciences and Minerals has produced a landslide risk warning map for the mountainous northern provinces, the north-central region and for Quang Nam and Quang Ngai. The map was made at the commune level at a scale of 1 / 50,000.
However, this map warns of risk over a wide range and is based on topography, geology, and storks.It depends on the specific conditions of the site such as structures, roads, plus the amount of rain that falls to reach the landslides.
“In Vietnam, there is an early warning system based on hazard and rainfall maps to dispatch localities and countries that have installed early warning systems. But it only brings a certain effect. In fact, landslides still occur and cause damage, “Thanh said.
Deputy Prime Minister Trinh Dinh Dung said that landslides are ‘enemies’ with extremely difficult conditions in forecast and warning – Photo: CHI TU TU
Vice Premier Trinh Dinh Dung said that Japan did well in warning, but landslides still increased by 50% compared to before. “Unlike storms or other types of natural disasters, landslides are ‘enemies’ that are extremely difficult to forecast and warn to respond even if we try,” emphasized the deputy prime minister.
In many places, people have lived stably for several decades, the geology is considered stable, but landslides have occurred over time.
For this reason, the Deputy Prime Minister suggested that next time the Ministry of Natural Resources and the Environment and the ministries and agencies concentrate on completing the warning map of the risk of landslides and rocks in more detail.
“Landslides come from many causes. Therefore, scientists and specialized agencies need timely scientific information so that people can understand, avoid misunderstandings and an inadequate understanding about the cause of landslides” – emphasized the vice-first Minister.
Japan combines 3 elements
Sharing more about the response to the landslides, Mr. Yasuhiro Tanaka – Jica expert, disaster risk management advisor to the General Department of Disaster Prevention (Ministry of Agriculture and Rural Development) – said that the topography of Japan There is a steep slope, so landslides are frequent.
“Japan also has a ‘headache’ in knowing when and where a landslide might occur. Because there are many factors that cause landslides, such as depending on the distribution of rainfall or the geological characteristics of each one. region “- said Mr. Tanaka.
Mr. Yasuhiro Tanaka shared his experience in responding to landslides in Japan – Photo: INTELLECTUAL
According to Mr. Tanaka, to provide a landslide warning, Japan relies on 3 factors and combines them to prevent landslides.
“First, we find out the rain and then we divide it into areas, the red area is the area with heavy rain, high risk of landslides, the local government will announce and plan to relocate people when possible There was a landslide.
Second, we build an early warning system, rain monitoring stations within 10,000 m2 to notify people of the move.
Third, we pay attention to buildings to avoid landslides. Based on the hazard warning map to build buildings to prevent floods, the most famous example is the Sabo dam to prevent mud, rocks … “- shared Mr. Tanaka.
