Directly hit the front line of emergency rescue ｜ Visiting the largest temporary living resettlement site of Huarong County, the related work was carried out in an orderly manner

CCTV News:At about 16: 00 on July 5, a piping hazard occurred on the first dike of Tuanzhouhuan Dongting Lake in Huarong County, Hunan Province. At 17: 48 on the 5th, the dam burst after the emergency blocking failed. At this moment, it has been 24 hours since the dike burst. Let’s go straight to the front line of emergency rescue and sort out today’s focus.

Focus 1: plugging operation is in progress. The flood broke the dike and flooded the embankment, and the rescue forces from all over the country quickly gathered near the breach. After a day and a night of rescue, the water level difference between inside and outside the breach gradually narrowed. At about 17: 00 on July 6, the site was fully blocked. At this moment, the plugging operation is still in progress.

Focus 2: Full resettlement. At about 18 o’clock on July 5, about 5,000 people who need to be transferred from 6 villages and 1 community nearby have basically been transferred. At this moment, it is in the evening. What is the resettlement situation of the masses? Let’s watch together.

Schematic diagram to know the location and process of breach danger in detail.

Let’s first learn more about the location and process of the danger through the schematic diagram. Tuanzhou Township is located on the west side of the northern water body of Dongting Lake, and Yueyang City is located on the east side of the northern water body of Dongting Lake. The location of the breach is located in the first dike of Tuanzhouhuan Dongting Lake in Tuanzhou Township, Huarong County. When the breach occurred, the width of the breach was about 10 meters, and by 23: 00 on July 5, the breach had expanded to more than 100 meters. By 6: 16 on July 6, the width of the breach was about 225 meters, and the flooded area caused by the breach was about 45.92 square kilometers. At 9 o’clock on July 6, the water level difference between inside and outside the breach reached 0.21 meters, with a length of 226 meters. With the emergency rescue, by 11: 00 on July 6, the gap between the internal and external water levels at the breach had dropped to 0.10m.. By 13: 00, the water level inside and outside the breach was flush, and the flow velocity was relatively gentle, which gradually provided the initial conditions for plugging the breach.

Let’s look at it from another angle. This is a picture of the dangerous geographical location provided by the Ministry of Water Resources. The position indicated by the arrow in the picture is the position where the breach occurred, and the position of the red circle is the Tuanzhou embankment. The total area of the embankment is 50.15 square kilometers, which belongs to the Dongting Lake siltation plain area. There is no highland in the embankment, and the terrain is not undulating and relatively flat. After the breach, it was flooded. This area in the middle is Qiannan Huan, which is also the second line of defense reinforced by rescuers in the past 24 hours. It is necessary to guard against areas that will never be flooded.

Qianliang Lake embankment, where Tuanzhou embankment is located, is an important flood storage and detention area of the country. The purple line in the figure is 157.96 kilometers long, which is mainly composed of Dongting Lake embankment, Ouchi embankment, Huarong embankment, south embankment for protecting the city embankment, Qianjian embankment and the section from Qianjian embankment to National Highway 240. By the end of 2022, the resident population in the area was about 281,000.

The rescue team is racing against time to carry out the sealing and closing operation.

At this moment, the rescue team is racing against time to carry out the operation of blocking and closing the dragon. What is the situation now? We’ll connect with Li Yanjun, a reporter from the reception desk.

According to the reporter, at the scene, the rescue team is racing against time to carry out the closure and closure operation through multi-party cooperation and mechanization. The closure and closure will start from both ends, and the water level will be more effective. After the closure, all kinds of equipment will be used for pumping.

Expert interpretation: Why wait for the water level to be flat before blocking the breach?

At this moment, a comprehensive plugging is being carried out, and one of the conditions for plugging is that the internal and external water levels at the breach are flush at present. Why can the water level be completely blocked? In addition, Tuanzhouyuan has been flooded in a large area. How to deal with the redundant flood after plugging? Let’s listen to the expert’s interpretation.

The rising process of water level in Dongting Lake directly hit by satellite images.

Affected by the continuous heavy rainfall and the increase of upstream water, the water level in Dongting Lake has been rising in recent days. On July 3, the water levels in the east and south Dongting Lake exceeded the police. With the rising water level, the water surface of Dongting Lake is also gradually expanding. According to the news of the Ministry of Water Resources, the water surface of Dongting Lake was only 1,100 square kilometers on June 17 and about 2,570 square kilometers on June 30. Let’s get an intuitive understanding through the satellite images released by China Land Observation Satellite Data Center. These two images are the images of Dongting Lake at the Yangtze River exit, the left image is the image before the flood on May 28th, and the right image is the image in the flood on July 2nd. By comparison, we can see that the large meadow or land in the red circle in the image before the flood has been completely submerged in the image in the flood.

What we see now is the radar image of Dongting Lake. The left picture shows the image taken before the flood on June 23rd, and the right picture shows the image of the flood on July 2nd. The black area in the right picture is the flooded area. By comparison, it can be found that a large area of land in the red circle in the pre-flood image has been flooded, and the slender river channel where Yuanjiang enters the lake has become a part of Dongting Lake in the July 2 image.

The dynamic image of Dongting Lake now shows the process that the inland area of Dongting Lake has been continuously reduced and the water surface area has been continuously expanded due to the recent influx of super-alarm floods from upstream tributaries.

The contrast map of Tuanbei Village in Huarong County we are seeing now is the image taken before the dike burst at 13: 00 on July 5 and the image taken after the dike burst at 9: 00 on July 6. In the picture on the right, the khaki area is the area covered after the dike burst.

News link: What is piping?

This burst was caused by piping. What is piping? Piping is one of the common dangers in dike engineering, also known as undercurrent and soil flow, which means that water flows through pores or cracks in the soil to form a water channel similar to a pipeline, resulting in soil particles being taken away and cavities being formed. When the cavity expands to a certain extent, the dam will collapse and break.

Expert Interpretation: What are the hazards of piping? What should I do if piping happens?

What are the hazards of piping? What should I do after piping? Let’s listen to the interpretation of relevant experts from the Ministry of Water Resources.

Xu Weihong, a senior engineer of the Disaster Reduction Center (Defense Center) of the Ministry of Water Resources, said that piping will empty the soil layer under the embankment foundation, which will seriously cause the embankment to break. There are but not limited to the following three methods:

1. "Anti-filtration method": Retaining sand for seepage to reduce the water level difference of breach.

2. Build a dike cofferdam at the back of the dike.

3. "Reverse filtration and capping method": reduce the water inflow velocity and stabilize the dangerous situation.

The reporter from the reception desk visited the largest temporary living resettlement site for the masses in the city.

It’s almost a day since the Dongting Lake levee burst. Fu Lei, a reporter from the reception desk, is at the largest security point in Huarong County at the moment. What’s the situation there? Come and see the live report she sent back

The reporter went to the new campus of Huarong Vocational Secondary School in Huarong County, where the local government set up a temporary living resettlement site, which is also the largest resettlement site in the urban area and can accept more than 3,000 displaced people. In addition, Huarong County People’s Hospital has also set up a medical emergency point here to provide blood pressure measurement and health consultation services for the elderly.

The reporter also saw people arriving at the school by bus one after another at the scene. Since the early morning of July 6, the school has accepted more than 700 transferred people. After registration, each of them was assigned to a dormitory bed. Following the reporter’s lens, we can see that there are six beds in each dormitory, and each bed is equipped with a mat and toiletries. People who are transferred can also receive mosquito-killing tablets, washing powder, washbasins and other daily necessities. The school has also set up a special psychological counseling group to provide emotional counseling to the masses.

At the same time, emergency resettlement teams, such as volunteer service team, food safety team, health and epidemic prevention team and security team, have been set up in this resettlement site, and more than 120 people have provided life services and guarantees to these displaced people.

The relevant state departments urgently added 5,000 family emergency kits to support the local people in the emergency transfer and resettlement work. In order to transfer and resettle the masses, provinces, cities and counties have urgently allocated 1,000 tents, 3,200 folding beds, 3,200 summer quilts and 3,200 mattresses.

From the morning of July 6th, in order to ensure the safety of the displaced people, all the temporary resettlement sites on July 5th were moved to Huarong County Vocational Secondary School, Zhuangyuan Lake Experimental School, zhanghua School, Experimental Primary School and other resettlement sites in Huarong County again. All four resettlement sites have been prepared and ready to accept the displaced people.