The affected area of the Zhouqu debris flow, which year is the Zhouqu debris flow

Location: Zhouqu County, southern Gansu.

Event: Sudden and extraordinarily large debris flow disaster;

**: 1,239 people have died so far.

Reason: On the evening of August 7, heavy rainfall occurred in the local area, and the county suffered a mudslide disaster at around 12 o'clock. Mudslides rushed into the county and cut off the river to form a dammed lake;

Disaster: Half of Zhouqu County was flooded, a village was flooded as a whole, power was cut off in the urban area, and more than 1 meter of silt had appeared on some streets.

The Zhouqu mudslide affected an area of 2.5 million square meters.

In 2010.

At about 22 o'clock on August 7, 2010, the northeast mountainous area of Zhouqu County, Gannan Tibetan Autonomous Prefecture suddenly fell extremely heavy rain, the rainfall reached 97 mm, lasted for more than 40 minutes, triggered Sanyanyu, Luojiayu and other four ditch system of extremely large flash flood geological disasters, the debris flow is about 5 kilometers long, the average width is 300 meters, the average thickness is 5 meters, the total volume is 7.5 million cubic meters, the flow through the area was razed to the ground.

As of September 7, 2010, 1,557 people were killed and 284 people were missing in the Zhouqu 8.7 debris flow disaster, and a total of 2,315 people were outpatient.

Geological and geomorphological reasons. Zhouqu is one of the three major geological disasters prone to landslides, debris flows and geological disasters in China. The Zhouqu area is a folded belt in the western part of the Qinling Mountains, where the mountains are seriously differentiated and broken, and most of them belong to the soil mixed with carbon ash, which is very easy to form geological disasters.

5 12 "** shook the mountain. Zhouqu is one of the hardest hit areas of "5 12"**, which causes the mountain in Zhouqu to loosen and collapse, and it will take at least 3 to 5 years for the mountain to recover to the pre-earthquake level.

Meteorological reasons. Most parts of the country have suffered severe drought, which has caused the rock mass and soil to shrink, the cracks to be exposed, and the heavy rainfall has been encountered, and the rainwater is easy to enter the mountain crevices, forming geological disasters.

Instantaneous heavy rainfall and heavy rainfall. Due to the cracks in the rock mass, instantaneous heavy rain and heavy rainfall penetrate deep into the rock mass, resulting in rock collapse, landslides, and debris flows.

Characteristics of the freedom of geological hazards. Geological disasters are hidden, sudden, and destructive, and difficult to find out.

Summary. In order to solve the problem of Zhouqu mudslide, it is first necessary to conduct a comprehensive disaster investigation and assessment to understand the situation in the disaster area and the scale of the disaster. Next, the focus is on emergency rescue and rescue work, including evacuating trapped people, providing emergency supplies and medical assistance, etc.

At the same time, it is also necessary to organize professionals to analyze and study the causes of debris flows, so as to provide a scientific basis for the prevention of similar disasters in the future. In the process of post-disaster reconstruction, it is necessary to carry out land management and water resource management, strengthen river regulation and bank protection construction, so as to reduce the recurrence of similar disasters. In short, the solution process of Zhouqu debris flow includes post-disaster assessment, emergency rescue, disaster cause analysis and preventive measures, and post-disaster reconstruction.

In order to solve the problem of Zhouqu mudslide, it is first necessary to conduct a comprehensive disaster investigation and assessment to understand the situation in the disaster area and the scale of the disaster. Next, the focus is on emergency rescue and rescue work, including evacuating trapped people, providing emergency supplies and medical assistance, etc. At the same time, it is also necessary to organize professionals to analyze and study the causes of the occurrence of coarse debris and debris flow, so as to provide a scientific basis for the prevention of similar disasters in the future.

In the process of post-disaster reconstruction, it is necessary to carry out land management and water resource management, and strengthen river improvement and bank protection construction to reduce the recurrence of similar disasters. In short, the solution process of Zhouqu debris flow includes post-disaster assessment, emergency rescue, disaster cause analysis and preventive measures, and post-disaster reconstruction.

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In order to solve the problem of Zhouqu debris flow, it is necessary to comprehensively investigate the disaster situation and assess the scale, carry out emergency rescue and rescue work, analyze the cause of the disaster and study preventive measures, and carry out land management and river improvement in the transportation and marketing area.