Why do heavy rains and floods occur in the central region?

Dr. Mai Van Khiem, Director of the National Center for Hydrometeorological Forecasts, said that the tropical convergence band passes through the Central Coast, together with tropical cyclones that are continuously formed towards the continent of our country. With the cold air and northeast monsoon constantly adding together with the wind blocking topography of the Truong Son mountain range, they are the main reasons that caused heavy rains and flooding in the central region recently.

Large floods and floods are caused by the specific topographic conditions of the hydrographic basins of the central region, such as rivers that are often short, with steep slopes, so the time of concentration of floods is usually very fast. Additionally, the area has a very small and narrow plain, which is often blocked by sandbars along the coast, reducing drainage from floods. The flooding from the previous flood hasn’t completely subsided after that, leading to deep and prolonged flooding.

“Currently in the main rainy season in the Central region, the occurrence of rains and floods in this period is consistent with the law. However, the occurrence of high intensity rainfall and a long and prolonged total amount has caused the flood water level in many stations to exceed the historical value in recent years, ”said Dr. Mai Van Khiem.

Dr. Mai Van Khiem said that since the beginning of 2020, based on the analysis of changes in the atmosphere, oceans globally and in the region, the General Department of Meteorology and Hydrology (Ministry of Natural Resources and Environment) had a newsletter. especially make early comments about the possibility of complicated developments in the rainy, storm and flood seasons in 2020 and send them to the Central Steering Committee for the prevention and control of natural disasters.

Starting in mid-2020, seasonal forecast reports (published in May and June 2020) from the National Center for Hydrometeorological Forecasting began to make the first statements about a hurricane season. in a rush at the end of the year, especially in October and November 2020 and concentrating on the Central region. In October, the Center has continuously released reports to forecast very heavy and prolonged rains in central Vietnam. In forecast reports, the level of risk of natural disasters caused by heavy rains is reported at level 2-3.

In particular, in the October 15 warning bulletin, the Center stated that there will be a large and particularly large flood with a natural disaster risk level 3. The October 18 bulletin indicated that the situation is very urgent. The Center has raised the level of natural disaster risk from floods, flash floods and landslides to level 4. The close-to-reality forecasts are the result of the state’s international investment in the weather industry. hydrological.

As a member of the Assistant Team of the Central Steering Committee for Prevention and Control of Natural Disasters, Mr. Mai Van Khiem said that during recent natural disasters, the Steering Committee also rolled out many new forms of communication, such as Send text messages from proactively to subscribers in natural disaster hazard warning areas, giving early warnings to localities.

“It can be said that, under the impact of climate change, natural disasters are increasingly complicated and unpredictable. Even the advanced countries of the world have often suffered human and material losses due to natural disasters in recent years and we have also shared the damage with other countries … In the coming time, they need to continue to count on the coordination and cooperation of departments , sectors, unions, local authorities and people in all situations of natural disasters that threaten the life and property of people to reduce minimizing the damage caused by natural disasters, ”said Mr. Mai Van Khiem.

Nguyen duong