Concentrated outbreak of geological disasters in the hard-hit areas of Wenchuan Earthquake faces secondary reconstruction

On August 20th, Sichuan Province released the “8·13” catastrophic mudslide disaster situation. As of August 19, it had caused 5.76 million people in the province to suffer disasters and 75 large-scale geological disasters occurred. The loss was about 6.89 billion yuan.
As the earthquake-hit area, Mianzhu Qingping, Wenchuan Yingxiu and Dujiangyan's Longchi Sanxiang Township are also the places affected by the disaster.
Experts pointed out that the geological secondary disasters induced by earthquakes in mountainous areas will last more than 10 years, of which the high incidence period is 5 years. Earthquake-caused collapses, landslides, mudslides and flash floods form a chain of disasters that will test Sichuan for a long time.

The Sichuan Provincial Government has stepped up four measures, including group prevention and group testing, to cope with new disaster prevention problems.
“This damage was five times the magnitude of the earthquake.” On the afternoon of August 17, Tang Weiyuan was carrying her crying daughter and looked at her “Mingyuan” farmhouse buried deep in the mud.
“Earthquake can be reinforced when the house is cracked, and some things can be pulled out. Now that mudslides have been flooded and there is no flood,” Tang Weiyuan believes that the damage caused by the mudslide to Longchi is five times that of the Wenchuan earthquake.
After the earthquake, efforts was made to build the “Landscape Tourism Resort Town of Foreign Countries” in Dujiangyan Longchi Town, which was built after the post-earthquake reconstruction led by farmhouse music.
Tang Weiyuan's "Ming Court" is a farmhouse where Nankai Village of Longchi Town opened early. After the Wenchuan earthquake, the farmhouse was shattered. She and her sister Tang Weishu both used loans and borrowed money to get 700,000 yuan to reinforce and decorate. On May 1 last year, they were able to successfully open farmhouses with 40 people.
Tang Weiyuan said that just as she was looking forward to paying off the loans as soon as possible, the mudslides on August 13 made her hope instantly dry.
"Thinking of seriousness, did not expect such a serious"
In the following days, heavy rain, Dujiangyan Longchi, Wenchuan Yingxiu, and Mianzhu Qingping, the mudslides of these three earthquake-hit townships all exceeded expectations. On August 17th, the reporter saw in the Longchi Nanyue Village, dozens of yellow and white along the river bank. The villas are buried in the mud. These small villa farmhouses have been self-built by villagers and have also been built in the form of joint construction with Chengdu citizens, with investments ranging from several hundred thousand to two to three million.
"After the Wenchuan earthquake, we predicted that secondary disasters such as mudslides will be serious, but we did not expect such seriousness," Xu Qiang told reporters.
Xu Qiang is the leader of the compilation team of the “Special Prevention and Control Plan for Wenchuan Earthquake Geohazard”, deputy director of the State Key Laboratory of Geohazard Prevention and Geological Environmental Protection of Chengdu University of Technology and one of the authoritative geological disaster experts in China.
On August 13th, the storm clouds advanced along the Longmen Mountains arc.
At 1pm on the same day, heavy rain began to appear in Longchi Town, Dujiangyan City. At 3:00 pm, the debris flow of large mountain torrents began to erupt in Longchi. There are more than 50 ravines in Longchi River along the length of Longxi River. There are more than 50 ravine flows at the same time, which is nearly 4 times longer than the mud-rock flow that occurred after flooding in the year of the earthquake. 4 million cubic meters of mud has inundated countless new farmhouses on both sides of the Longxi River.
By the early morning of the 14th, the rainstorm cloud arrived at Yingxiu.
At 3 o'clock on the August 14th, Yingxiu rainfall reached 163 mm in just 2 hours. The mudslide in Yingxiu Hong Ditch finally broke out. 700,000 cubic meters of debris flowed out of the Red Ditch and cut off the Lancang River. Diversion of the river instantly flooded the newly completed area of ​​Yingxiu Town.
Dujiangyan's Longchi, Wenchuan Yingxiu, and Mianzhu Qingping, the towns and towns in the three earthquake-hit areas, have exceeded the expected size of the mudslide outbreak. Xu Qiang said that there have been no mudslides in the earthquake-stricken areas for many decades and this time there have been mudslides.
On August 13th, after the outbreak of mudslides in Mianzhu Qingping, he first arrived at the Qingping field investigation.
"Great ditch and small ditch, almost all ditch and ditch," said Xu Qiang, in Qingping Township, along the Mianyuan River within 3 kilometers, there are more than 10 ravines at the same time outbreaks of debris flow. At the end of the year, the volume of debris flow out of the nearby Qingping Township reached 6 million cubic meters, which is considered to be a landslide and debris flow disaster rated by the country in recent decades.
The Sichuan Provincial Government announced on the 20th that as of 17:00 on August 19th, the heavy rainfall caused 75 geological disasters of large scale (including 30 landslides, 6 landslides, and 39 mudslides), and 5.76 million people were affected. The direct economic loss due to the disaster was about 6.89 billion yuan.