How are flash floods formed? Why is there a slim chance of a flash flood?

Flash floods are caused by prolonged rainstorms, melting snow and ice, or flood-landslides caused by the collapse of blue-red equipment. Among the most common floods, flash floods caused by heavy rains are the most common in life. So the flood is not just water, but also tree branches, weeds, stones, etc.

Sometimes it will be like a muddy flood. In particular, near ravines or on the concave and convex areas on both sides of rivers, they are most vulnerable to flash flooding. Flash floods are fast, short-lived, and extremely destructive.

A precursor to flash floods. Before the flash flood, he didn't have warning signs at all from the beginning, and there were some precursors for us to observe. For example, the ground suddenly appears to be cloudy water, and the animals and plants are abnormal.

If you hear a rumbling sound in front of the top of the ditch, be vigilant and check if there is a flash flood and take shelter in time. Once a flash flood breaks out, we are in a race against natural disasters, so we must flee the scene in time and decisively.

Tips for avoiding danger and escaping in the event of a flash flood. Pay more attention to the warning signs of the weather forecast, and try to avoid some dangerous areas such as mountain rivers and rivers. In particular, some natural disasters mark danger zones, which must be avoided and cannot be taken lightly because of carelessness.

Don't hesitate when you encounter a flash flood, all your belongings should be abandoned, immediately run in the direction of the early warning signal, if unfortunately surrounded by floods, don't panic at this time, and try to get in touch with the fire department, you can use your mobile phone to dial ** directly explain your location, and actively seek help from others.

When the water is **, where the cane is killed, if there is no better and safer place, you must make full use of the utensils around you. If there are planks or other floating materials that can be used to escape, the escape work should be carried out immediately, and do not stay where you are. In the process of looking for an opportunity to escape, pay attention to the distance from telephone poles and the like, avoid electric shock, and stay awake in time during the escape process.

Flash flood refers to the surge flood that occurs in the mountain streams, and the flash flood is sudden, once it erupts, then the amount of water will be concentrated, the flow velocity is large, the impact force is very large, resulting in a small chance of survival.

Flash floods are due to many natural factors, such as heavy rain, and the chance of flash floods is very slim, because human beings are very small in front of nature.

Because the flash flood is really terrifying, once encountered, it is really difficult to avoid it.

1. It should be a "flash flood".

2. "Outbreak" and "outbreak" are both verbs, both of which contain the meaning of "sudden onset", but the scope of use of the two is different, and the scope of use of "outbreak" is wider than that of "outbreak". "Outbreak" is a metaphor for the sudden and rapid occurrence of gunpowder**, and the scope of application is relatively wide, such as the sudden appearance of loud sounds, major events, etc. It also indicates a sudden onset or manifestation of personal strength, emotions, etc.

"Outbreak" refers to sudden and violent attacks, mostly caused by external conditions, and mostly used for specific natural objects related to water, such as flash floods, floods, etc. When used for people, it refers to the use of improper means to suddenly gain power and get rich, which is a derogatory term.

It's a flash flood.

Outbreaks are mainly used for sudden and violent attacks, mostly caused by external conditions, mostly for specific natural objects related to water, and often used in conjunction with people and things that suddenly become rich or powerful. Flash floods are specific natural objects related to water, and flash floods are caused by the external condition that the rain is large and concentrated, so the outbreak is used.

Eruption can refer to the sudden breakout of the earth's crust by the magma inside the volcano, describing the sudden onset and sudden rise, or it can also be compared to the sudden and rapid occurrence of gunpowder**, which has a wide range of applications, such as the sudden appearance of loud noises and major events.

Difference Between Explosion and Storm:

1. The reference is different.

Explosion: Burst suddenly. Storm: Sudden and violent.

2. The source is different.

Burst, scorch. From the fire, the storm sounds. Vernacular Interpretation:

Burst, burn. The glyph uses "fire" as the side, and "storm" is the sound side. Storm:

Xi also. From the day, from the out, from the squeak, from the meter. Vernacular Interpretation:

Storm, sunshine. The glyph adopts the four-form meaning of "sunrise rice".

3. The nature is different.

Explosion: Shape sound. From the fire, the storm sounds. Original meaning: to explode and make a sound. Storm: The word will be meaningful, from the sun from the rise from the rice, originally refers to the two hands of agricultural tools in the sun to dry rice.

Summary. Jiangnan refers to a part of the southeastern region of China, which roughly includes the provinces of Jiangsu, Zhejiang, Anhui, Shanghai, Jiangxi, Fujian, etc. Because of its geographical proximity to the Yangtze River and Taihu Lake, this area has been a very prosperous economic and cultural center since ancient times, with a long history and splendid culture.

The Jiangnan region has a mild and humid climate, fertile land, and beautiful natural scenery, making it a tourist destination.

Jiangnan refers to a part of the southeastern region of China, which roughly includes Jiangsu, Zhejiang, Anhui, hosiery Shanghai, Jiangxi, Fujian and other provinces. Because of its geographical location, this area is close to the Yangtze River and Taihu Lake, and has been a very prosperous economic and cultural center since ancient times, with a long history and splendid culture. The Jiangnan region has a mild and humid climate, fertile land, and beautiful natural scenery, making it a tourist destination.

Flash floods are a catastrophic phenomenon caused by the formation of extreme weather such as torrential rain and blizzard in mountainous areas when a large amount of rainfall or melted snow flows to rivers, streams and other waterways, resulting in a sharp rise in river water levels, faster flow speeds, and increased impact on water bodies. Specifically, here are some of the causes of flash floods:1

Heavy rainfall: Rainfall exceeds what the local hydrological system can handle, causing rivers to reach rapidly**, resulting in flash floods. 2.

Geological formations: Geological hazards such as **, landslides, and debris flows may alter the hydrological characteristics of rivers, which in turn can lead to flash floods. 3.

Glacial lake dam failure: In high-altitude mountainous areas, glacial lake dikes are prone to collapse due to glacial melt and rainfall, resulting in reservoir dam failure and flash flooding. 4.

Deforestation and land-use change: Deforestation leads to loss of soil and water conservation capacity, and soil erosion is susceptible, affecting the hydrological environment of mountainous areas and breeding flash floods. 5.

The natural conditions of the river are harsh: the river is narrow and steep, the flow speed is fast, the gradient is large, and the impact of the water flow is strong, which is easy to cause flash floods. It should be noted that flash floods are an extremely dangerous natural disaster that causes huge losses to people's lives and property.

Therefore, the prevention and mitigation of the impact of flash floods is of great significance for the residents and economic development of mountainous areas.

Flash floods are the most commonCaused by heavy rainfallIt usually refers to the flood that rises and falls along rivers and ravines in mountainous areas, and the accompanying landslides, collapses, and debris flows, and the failure of flood control facilities can also cause flash floods. Formative factors include:Geological and geomorphological factors, meteorological and hydrological factors, and human activity factors

1. Geological and geomorphological factors:

The topography of the flash flood disaster-prone areas is often high mountains, steep slopes, deep valleys, large cutting depths, erosion valleys, and most of its geology is soil with little permeability intensity, such as argillaceous rock, slate shale developed into weak erosion resistance soil, easy to soften and disintegrate when exposed to water, which is very conducive to the rapid collection of surface runoff after heavy rainfall, and when encountering a strong surface runoff impact, thus forming a flash flood disaster.

2. Meteorological and hydrological factors:

The unstable climate system in the hilly region often results in persistent or concentrated heavy rainfall. According to statistics, the occurrence of flash floods is mainly due to the continuous excessive rainfall in the affected areas in the early stage, which saturates the soil moisture and loosens the surface. From the physical process of overall occurrence and development, it can be seen that the occurrence of flash floods is mainly caused by continuous rainfall and short-term heavy rainfall.

3. Human activity factors:

Excessive land development in hilly areas, or steep slopes to open up wasteland, or engineering construction that causes damage to the mountain, changes the topography and landform, destroys natural vegetation, indiscriminately cuts down forests, and loses the role of water conservation, all of which are prone to flash floods.

The cause of flash floods is that rainfall saturates the soil with water content on the mountain, and the rainfall forms runoff on the mountain, which is formed by the runoff that gathers together with the mountain.

A flash flood is a flood that occurs in a mountain stream or ravine. Mountain floods are sudden, the water is concentrated and the flow rate is large, the erosion is destructive, and the water flow carries sediment and even stones, etc., which often causes local floods, which are generally divided into torrential rain mountain floods, snowmelt mountain floods, glacial mountain floods, etc. By improving flood control standards, adjusting human activity methods, and enhancing the awareness of disaster prevention and avoidance among people in mountainous areas, the purpose of reducing the frequency of flash flood disasters or reducing their hazards can be achieved.

In the planning of flash flood prevention and control, it is advisable to combine engineering measures and non-engineering measures in the near term, and plant measures in the long term.

"Outbreak" refers to a sudden and violent attack, mostly caused by external conditions, mostly used for specific natural objects related to water, and when used for people, it is often used in conjunction with people and things that suddenly become rich or powerful.

Flash floods are specific natural objects related to water, and flash floods are caused by the external condition that the rain is large and concentrated, so the outbreak is used.

Outbreak bàofā

Sudden wealth or power (often in a derogatory sense): household.

Sudden onset: flash floods.

Outbreak bàofā

The magma inside the volcano suddenly breaks through the earth's crust and bursts out in all directions: the volcano.

Significant changes take place through external conflicts, such as the use of revolutionary means to overthrow the old regime and establish a new one.

strength, emotion, etc.); Suddenly: War.

Flash floods are most commonly caused by torrential rainfall, usually referring to the rapid rise and fall of floods along rivers and ravines in mountainous areas, accompanied by landslides, avalanches, and mudslides. Failure of flood control facilities can also cause flash floods. Flash floods refer to the hazards caused by flash floods to people, including loss of personnel, property, infrastructure and environmental sail resources.

Flash flood disasters are divided into debris flow disasters, landslide disasters and stream flood disasters.

Flash floods are special floods in hilly areas, and the masses are accustomed to calling them"Fa Jiao"。Flooding generally lasts from a few dozen minutes to 1 2 hours. The main conditions for formation are as follows:

1. Topographic conditions: Generally, the topographic characteristics of mountain floods and debris flows are medium and high mountainous areas, with large relative elevation differences and steep river valley slopes. The surface layer is covered with thick soil with grafting, and the bottom layer of the soil is a broken rock layer cut by medium-deep faults and their derivative faults.

2. Forest cover conditions: a wide range of forests, moso bamboo cover ruler Qi cover, when the humid air carries a large amount of water vapor in the flood season, reaches the sky above the forest area, and the cold air with low temperature and high relative humidity in the forest area is easy to cause large local precipitation.

3. Water source conditions: water rest is not only a component of mountain floods and debris flows, but also a triggering factor, mainly from rainfall.

The phenomenon of rainfall triggering flash floods is the combined effect of previous rainfall and a continuous rainfall. Second, the early rainfall and the maximum hourly rainfall play a leading role in stimulating it. The water content of the soil on the top of the mountain is saturated, and the pressure of the pressurized water body in the cracks of the rock layer below the soil increases sharply.

In the event of heavy rain, energy accumulates rapidly; As a result, the original soil balance is destroyed, and the pressurized water body in the cracks of the soil and rock layer breaks through the surface cover, and instantly pours down from the upper and upper parts of the mountain, causing flash floods and debris flows.

When the humid airflow is blocked by the mountain, the humid airflow will move upward, forming cold and warm fronts on the mountaintop and windward slope to produce thunderstorms. Because the middle and upper part of the mountain stretches into the clouds, the ground is still very hot, and when the mountain rain is about to come and the wind is full, the middle and upper part of the mountain is already in two layers. So often the rain on the ground is not long.

Then the flash flood broke out. The experience of villagers in flash flood-prone areas is particularly muggy, often the same"Fa Jiao"Together.

In addition to the structural conditions of the mountain, the cause of flash floods is mainly caused by the topography of the trumpet-shaped estuary, which forms short-duration thunderstorms and causes flash floods.