"Utilization, Development and Protection of Water Resources" PPT

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"Utilization, Development and Protection of Water Resources" PPT

Part One: Thoughts and Discussions

discuss:

To summarize from the perspective of the water cycle, what are the common characteristics of several freshwater bodies that humans currently use more?

Answer: Several types of fresh water currently used by humans include lake water, river water and groundwater, all of which are collected from atmospheric precipitation. The quantity is small and the water body renews quickly.

distribution of water resources

Water resources are closely related to the activity of the water cycle in a region. For a region:

The amount of water people use is equivalent to the difference between the total amount of precipitation in the area over a period of time and the amount of water lost by evaporation during the same period.

think

1. Why do some cities in countries with very abundant water resources also experience water supply difficulties?

Unequal distribution of water bodies is closely related to population size, excessive water use for industry and agriculture, and pollution.

2. Calculate and analyze the distribution characteristics of world water resources based on tables.

3. Based on the ranking changes of the total annual runoff and per capita annual runoff of each continent, give us your opinion?

Utilization, development and protection of water resources PPT, Part 2: Characteristics of spatiotemporal distribution of water resources in my country

In terms of time distribution: rivers are abundant in summer and lacking in winter, and river runoff varies greatly between years.

From the perspective of spatial distribution: more in the south and less in the north, more in the east and less in the west.

As for the cause of red tide, based on current research results, it is believed that red tide is closely related to marine pollution. Large amounts of urban domestic pollution and industrial wastewater carrying various organic matter and inorganic nutrient salts are discharged into the sea, resulting in eutrophication of the sea area and the basic cause of red tides. At present, once red tide occurs, it is very difficult to remove it. The best way to prevent red tides is to effectively control the arbitrary discharge of coastal industrial and domestic sewage, especially to control the discharge of nitrogen, phosphorus and other organic matter to avoid eutrophication of sea areas and prevent the occurrence of red tides.

Utilization, development and protection of water resources PPT, Part 3: Water purification in water plants

Physical stage: Remove solid particles from water through filtration and sedimentation.

Chemical stage: Inject chlorine gas to kill microorganisms in the water.

Biological stage: removing toxic substances from water with the help of microorganisms.

Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, water resources utilization, development and protection PPT download, .PPT format;

For more information about the PPT courseware "Utilization, Development and Protection of Water Resources", please click on the Utilization, Development and Protection of Water Resources ppt tab.

"Utilization, Development and Protection of Water Resources" PPT courseware:

The first part of the "Utilization, Development and Protection of Water Resources" PPT courseware content: Reading Figure 1-56 to Figure 1-60 on page 39 of the textbook on Water Resources Utilization and Development: What is the close connection between water and human life and production? Drinking and irrigation , washing, industrial water and other global water resources...

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Update Time: 2024-10-17

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

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