"Mudslide" PPT

Description

"Muds Flow" PPT download

Part One: Debris Flow

Debris flow refers to a special torrent carrying a large amount of sediment and rocks caused by heavy rain or other reasons in mountainous areas.

Characteristics: sudden, short-lasting, often accompanied by landslides and collapses, with huge destructive power.

Debris flow distribution

There are potential threats from mudslides in more than 50 countries in the world, with Colombia, Peru, Switzerland, China and Japan being the more serious ones.

Debris flows are particularly serious in my country's provinces such as Sichuan, Yunnan, Gansu and Tibet.

Explore mudslides

Ask the question: What are the causes of debris flows?

Establish hypotheses and conjectures:

May be related to terrain slope

It may be related to the amount of precipitation

possible……

Debris flow PPT, part 2: reasons

1. Natural causes

1. Mountainous areas (especially steep terrain) are conducive to water flow.

The flow rate of the water flow is relatively large and the scouring power is strong.

2. There is a large amount of loose debris accumulated on the surface of the hillside or valley.

(soil, stones, etc.), easily washed away by water flow.

3. There are heavy rains or continuous precipitation, resulting in a large amount of running water.

2. Human reasons

Human activities have changed the natural environment in areas where debris flows occur, such as changing the ground morphology and soil structure, or changing the conditions of ground vegetation, thereby promoting the occurrence of debris flows.

Debris flow PPT, the third part: practice

1. Areas prone to mudslides are ( )

A. Steep valley mountainous area B. Plain area

C. Arid areas in northwest my country

D. Areas well covered by surface vegetation

2. The climate characteristics of areas prone to debris flow disasters are ( )

A. High temperature and little rain all year round B. Dry all year round

C. Rainfall is unevenly distributed and heavy rains are concentrated. D. Precipitation is uniform throughout the year.

Debris flow PPT, part 4: defensive measures

How should we escape from a mudslide?

When a mudslide occurs, you should try to run from the house to an open area and quickly move to a high place. Do not escape upstream or downstream along the ditch, but escape to the hillsides on both sides. Never cross in a mudslide.

Based on the formation conditions of debris flows, what methods can be used to reduce the occurrence and harm of debris flows?

1. Establish a prediction, forecasting and disaster relief system;

2. Promptly relocate and evacuate residents, businesses and important engineering facilities that are seriously threatened by debris flow;

3. Afforestation;

4. Construct engineering facilities to block, adjust and divert debris flows;

5. Effective rescue and relief measures when struck by disasters

Debris flow PPT, part 5: practice

1. Among the two slopes A and B in the picture below, which one is more likely to cause mudslides?

Answer: Slope B is easier. Slope B has sparser vegetation and a steeper slope.

2. There is a mudslide on the mountain, and you are right in the middle of the path of the mudslide. In which direction should you escape? ( )

A. Run in the direction of the mudslide

B. Run in the direction of the mudslide

C. Run perpendicular to the direction of the debris flow

D. Run in a direction that is at a certain angle to the debris flow.

3. Which of the following human activities can induce debris flow disasters ( )

①Indiscriminate deforestation ②Mining and quarrying

③Construct engineering facilities and damage the surface of the hillside

④Earthquakes ⑤Afforestation

A. ①②④⑤ B.①②③ C.②③④ D.③④⑤

Keywords: Zhejiang Education Edition seventh grade science PPT courseware free download, debris flow PPT download, .PPT format;

For more information about the "Muds and Rocks Flow" PPT courseware, please click on the "Muds and Rocks Flow" ppt tab.

"Muds and Rocks Flow" PPT courseware:

"Debris Flow" PPT Courseware Part One: Learning Objectives: 1. Know the conditions for the occurrence of debris flows; 2. Know the hazards of debris flows; 3. Understand the methods to reduce the hazards of debris flows; 4. Enhance the awareness of disaster prevention and resistance. ... ... ... Debris Flow PPT, Chapter..

"Mudslide" PPT:

"Debris Flow" PPT Part One Content: Learning objectives: 1. Know the conditions for the occurrence of debris flows; 2. Know the hazards of debris flows; 3. Understand the methods to reduce the hazards of debris flows; 4. Enhance the awareness of disaster prevention and resistance. ... ... ... Debris Flow PPT, Part 2...

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Update Time: 2024-11-22

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 1 industry PPT template

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