More than 2,600 places in the key areas of earthquakes in Chengdu Mountains in Chengdu of the Chinese Academy of Sciences are used for disaster relief and reconstruction

"The sliding bodies on both sides of the Library of the Dangli Hydropower Station in the northern part of Asanmian County are mainly small and medium -sized, with 23 slips with an area of ​​more than 10,000 square meters, accounting for 1.7%of the total number of landslides." Recently, the Chinese Academy of Sciences and the Ministry of Water Resources Chengdu Mountain Land Disaster and Environmental Research Institute (referred to as "Chengdu Mountain Institute") The remote sensing interpretation team is busy and orderly day and night busy: receiving remote sensing data in the earthquake disaster area, explaining and analyzing images, and quickly passing clear remote sensing images to earthquake resistance Relevant departments of disaster relief and frontline of the disaster area ...

It is reported that the "September 5" Luding earthquake caused the observation test stations in the Gongga Mountain Ecosystem of the Gongga Mountain Institute of the Chinese Academy of Sciences near the epicenter of the Earthquake, and one person was unfortunately killed. After the earthquake, the Chengdu Mountain Institute launched an earthquake emergency response as soon as possible, and set up a special science and technology disaster relief work class composed of on -site surveys, remote sensing interpretation and platform data. Technology support. At present, in response to the key areas of Musi Town and Dadu River Basin, the institute uses the pre -earth -high -scoring images and images of the afterbath drone provided by the Sichuan Surveying and Mapping Geographic Information Bureau and other units to interpret more than 2,600 places. It provides information guarantee for the rescue team to effectively fight the earthquake and verify the disaster.

Luding Deco Town Wan Dongcun after the earthquake collapse and skiing remote sensing interpretation

Use polyphor radar image

Quickly interpret more than 30 places in the collapse area of ​​the shock area

After the earthquake, how can the communication area interrupt and road blockage be more efficient?

"We actively produce remote sensing atlas at remote sensing analysis technology to assist the rescue team to understand the disaster in a timely manner." Ouyang Chaojun, director of the key laboratory of the mountain disaster and surface process of Chengdu Mountains, said The heavenly information innovation research institute and other units provided by the earthquake -high score 2 satellite data and images of the post -earthquake drone are provided. Carry out understanding and analysis. The Wandong Village survey area extracted 151 earthquake landslides, with a landslide area of ​​0.68 square kilometers, accounting for about 23%of the survey area. There were 25 landslides with a projection area greater than 10,000 square meters, accounting for 17%of the total number of landslides. The Moxi Town survey area extracted 704 earthquake landslides, with a landslide area of ​​2.5 square kilometers, accounting for about 5%of the survey area, and 67 landslides with a projection area greater than 10,000 square meters, accounting for 10%of the total number of landslides.

Suspected sliding body data near Caoke Township, Shimian County

The earthquake occurred in the high mountain canyon area. Due to the terrain restrictions, cloud obstruction, and vegetation obstruction, it is difficult to obtain the useful environment and disaster information of remote sensing optical images, especially to obtain the danger of disaster situation in the earthquake. In order to solve the problem of data extraction and disaster identification in the lack of regional disaster information, the Chengdu Mountain Institute team adopted more than 30 places in the collapse area of ​​the shock area.

According to the image of the multi -source synthetic aperture radar (SAR), using radar data to change the scattered intensity before and after the earthquake and combine the terrain and landform conditions of the disaster development, quickly interpret 17 suspected sliding areas in the 12km × 12km of the earthquake (the largest The area is about 1.56 square kilometers) and 1 hidden danger landslide point is interpreted in Caoke Township in the key disaster area.

Relying on mountain disaster risk simulation and danger forecast system

Prevent secondary disasters from occurring

According to the Wenchuan earthquake in 2008, the Lushan Earthquake in 2013, and the post -after earthquake monitoring data of the Jiuzhaigou earthquake in 2017, the strong earthquake will lead to a significant decrease in the rainstream of the mudslides in the high intensity. For example, in general, the rain stronger than 20mm may cause mudslides, but 10-15mm after the earthquake can be triggered.

Irsaimi County Mountains Disaster Forecasting Early Warning System

"Considering the high incidence of mudslides, and the Caishe Township Basin has just occurred on August 25 this year. Under the effect of rainfall, debris flow disasters are prone to occur. Therefore, we use the previously developed mountain disaster risk simulation and danger forecast systems to combine the Micro -Micro, Chengdu Yuanwang, and Chengdu Yundao. Real -time monitoring and disaster warning system for radar rainfall. "Ouyang Chaojun introduced it. At the same time, relying on the scientific data center of the mountains of Chengdu Mountains, the 6.8 -level earthquake -top -top -topic data set sharing platform of Luding County was established to share the collection of data and achievements in time. Strike the evaluation of earthquake disasters to prevent secondary disasters.

"The highest intensity of this earthquake is a degree (9 degrees), and the area (6 degrees) area and above are 19,089 square kilometers. A large number of slopes are strongly affected by the earthquake. Potential hidden dangers will be accurately investigated. In the next step, we will continue to conduct detailed seismic influence on the risk assessment of geological disasters after the earthquake, and assist local governments to carry out fine forecast and early warning of geological disasters. "Ouyang Chaojun said.

Chengdu Daily Jinguan Journalist Liu Fei Editor He Qixie Intern Editor Lu Yarui Confer Picture of the Chinese Academy of Sciences Chengdu Mountain Institute

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