"Flowing Water Landform" Earth Surface Form PPT Courseware

"Flowing Water Landform" Earth Surface Form PPT Courseware

Part One Content: Curriculum Standards:

Through field observation or the use of videos and images, identify 3 to 4 types of landforms and describe the main characteristics of their landscapes.

Literacy goals:

1. Be able to identify river landform types in different river sections of the basin and summarize their spatial distribution characteristics. (regional awareness)

2. Be able to name the landform types of different rivers, and briefly analyze their formation process, as well as the interaction between the formation of this landform, other natural geographical elements, and human activities. (Coordinated view of man and earth, comprehensive thinking)

3. Be able to conduct in-depth observations of river landforms and design experiments through field practice. (geographical practice)

4. Use data. Analyze the causes of landslides and debris flows and understand their hazards. (Comprehensive thinking, man-land coordination view)

Flowing water landform PPT, the second part of the content: essential knowledge and literacy foundation

1. Flowing water landforms

1. Concept: _____ shaped by running water.

2. Classification: flowing water _____ landform and flowing water _____ landform.

2. Landforms eroded by running water

[Discriminate]Determine whether the following statements are true or false.

①In mountainous areas or plateaus, river valleys are in a "V" shape. ( )

②The river terraces are distributed with river deposits and the soil quality is relatively poor. ( )

③Canyons are often formed in areas where river incision is strong. ( )

④Meanders and oxbow lakes are often seen in areas with steep terrain. ( )

3. Water accumulation landform

[Discriminate]Determine whether the following statements are true or false.

①Alluvial plains are formed by the accumulation of large amounts of sediment carried by rivers. ( )

②All rivers have deltas. ( )

③Alluvial fans are formed by the accumulation of flowing water. ( )

④ Delta landforms all appear at the mouths of rivers. ( )

4. Landslides and debris flows

1. Landslide:

(1) Concept: The phenomenon that a large amount of _____ matter slides along the _______ as a whole under the action of gravity.

(2) Harm: bury___________, block roads, block _____, resulting in casualties and property losses.

2. Debris flow:

(1) Concept: Mountain valleys contain a mixture of large amounts of solid ___________, a special fluid that flows downward along _____ under the action of gravity.

(2) Harm: It brings great harm to industrial and agricultural production, ________, urban construction and people ________.

[Discriminate]Determine whether the following statements are true or false.

① Water must be involved in the occurrence of landslides. ( )

② One of the common characteristics of areas prone to landslides and debris flows is the large terrain undulations. ( )

③Landslides and debris flow disasters occur frequently in the eastern coastal areas of my country. ( )

Flowing water landform PPT, the third part: key capabilities and literacy formation

Ability 1: Describe the landscape characteristics of river landforms

1. Landscape characteristics of river landforms:

2. Development of river landforms:

(1) River erosion landform - the development process of river valleys.

(2) The formation process of river accumulation landforms.

(3) Erosion and sedimentation of river bends.

When a river flows through a bend, the water flows toward the concave bank, while the water at the bottom flows from the concave bank to the convex bank. Under the action of flowing water, the concave bank erodes and the convex bank accumulates (as shown in the figure).

[Ideas] Describe it from the perspective of shape, terrain changes, sediment particle changes, etc.

[Analysis] Answer based on the plane shape of the alluvial fan in the picture, the topography in the cross-section, and the changes in particulate matter. The text labels "fan top" and "fan edge" in the picture should also be used.

Answer: It is fan-shaped with the valley mouth as the vertex. From the top of the fan to the edge of the fan, the terrain changes from high to low, the sediments change from thick to thin, and the particles change from coarse to fine.

【Literacy Research】

Picture a shows the Lancang-Mekong River Basin, picture b shows the landscape at the confluence of the tributaries of the Lancang River, and picture c shows a satellite image of a certain landform.

(1) (Comprehensive thinking, regional cognition) Name the landform type shown in Figure b, and analyze the changing characteristics of slope and sediment particle size.

Hint: alluvial fan. From the fan top to the fan edge, the slope gradually becomes smaller and the sediment particles change from coarse to fine.

(2) (Comprehensive thinking, geographical practice ability) Explain the formation process of the landform shown in Figure c.

Tip: When a river flows into the ocean, its flow rate slows down, and the sediment it carries is deposited at the river mouth.

Ability 2: Analyze the causes of landslides and debris flow disasters

1. Causes of landslide and debris flow disasters:

forming conditions

landslide

①Geological and terrain conditions: It generally occurs in mountainous areas with relatively broken rock masses and large terrain undulations. ②Surface vegetation conditions: Vegetation coverage is poor. ③Climate conditions: humid and semi-humid areas with abundant precipitation and large precipitation variability.

mudslide

①The terrain is steep; ②It has abundant loose materials;

③There is a large amount of water flow in a short period of time.

[Typical example demonstration]

Read "Distribution Map of Earthquakes, Debris Flows and Other Geological Hazards in Southwest my country" and complete questions (1) and (2).

(1) In the analysis of the causes of frequent geological disasters in this area, what is unreasonable is ()

A. Located at the junction of plates, the modern crust is active

B. The terrain is complex and the mountain slope is steep

C. The dry and wet seasons are distinct and heavy rains are concentrated.

D. The temperature varies greatly from day to day and the rocks are broken.

(2) Human activities may also induce geological disasters, such as destroying vegetation, which is most likely to cause ()

A.earthquake

B. Mudslide

C. Volcanic eruption

D.Collapse

[Idea Tip] Answering this type of questions mainly starts from the following two points:

(1) Analyze the crustal movement, terrain relief and precipitation conditions of the area based on materials or regional maps to determine prone geological hazards.

(2) Analyze natural disasters that may be induced by human activities based on the causes of earthquakes, landslides, mudslides, volcanic eruptions and other disasters.

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