"Elevated Riverbed" Changes in Ground Form PPT Courseware

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"Elevated Riverbed" Changes in Ground Form PPT Courseware

What do you know about the Yellow River?

The Yellow River is the second longest river in our country, with a total length of more than 5,500 kilometers.

The Yellow River is called the mother river of the Chinese nation

Comparing the pictures of the upstream and downstream just now, why do the Yellow River have such two completely different scenes?

Why does the river bed in the lower reaches of the Yellow River rise?

1. A large amount of sedimentation, and the downstream river bed continues to thicken and rise.

2. The sediment is mainly brought from the upper and middle reaches, and the lower reaches are in the North China Plain, where the terrain is flat and sediment is more likely to accumulate.

Information: "The river with the largest sediment content in the world"

The annual average sediment content per cubic meter of water in the Yellow River is about 35 kilograms, reaching 570 kilograms at its peak. The Yellow River imports 1.6 billion tons of sediment to the lower reaches every year. The ancients said that the Yellow River is "one stone (carrying) water, six buckets of mud". If the mud and sand were built into a long embankment of one meter high and one meter wide, its length would be three times the distance between the earth and the moon.

The reason why there is so much sediment in the Yellow River:

loess plateau

Natural factors: loose soil, sparse vegetation, concentrated precipitation

Human factors: over-exploitation, deforestation and grass destruction

Methods to regulate the Yellow River:

Carry out comprehensive management of the Loess Plateau, plant trees, rationalize grazing, and build terraces.

Along the Yellow River, dams can be raised, protective forests planted, and river channels opened.

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"Elevated Riverbed" Changes in Ground Form PPT Courseware 2:

"Elevated Riverbed" Changes in Ground Form PPT Courseware 2 Observation Upper reaches of the Yellow River Lower reaches of the Yellow River Discussion ①Through these data, do you know what important changes have taken place in the riverbed in the lower reaches of the Yellow River? ②Can you guess how these changes occurred? Thinking about Down the Yellow River...

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Update Time: 2024-11-18

This template belongs to science courseware E-education edition sixth grade science volume 1 industry PPT template

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