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Authoritative PPT Summary
"Water Resources" China's natural resources PPT courseware 6
1. Water is a precious resource
1. The concept of water resources
Broadly speaking: the total amount of water on the earth including seawater
Narrow sense: refers to the fresh water resources on the earth.
2. my country’s water resources
my country's water resources: the total amount ranks sixth in the world.
The per capita possession is 1/4 of the world average, ranking behind 110th place. More than half of the country's 670 cities suffer from water shortages to varying degrees, and more than 110 of them suffer from serious water shortages.
The total amount is large, the per capita amount is small, and water resources are scarce.
2. Uneven spatial and temporal distribution of water resources
1. From the perspective of time allocation: more in summer and autumn, less in winter and spring
what to do? ? build reservoir
2. From the perspective of spatial distribution:
More in the east and less in the west
More south and less north
what to do? ? South to North Water Diversion
3. Save water and protect water resources
On the one hand, the supply of water resources in our country is quite tight, but on the other hand, the utilization rate of water resources is low and the waste is alarming. Therefore, saving water and protecting water resources is one of the important ways to solve the problem of water shortage in our country.
Ask students to calculate:
1. Agricultural water consumption reaches 450 billion cubic meters every year. If the effective utilization rate is increased by 10%, how many billion cubic meters of water will be added every year?
Saving water and protecting water resources should start from me, start from small things, let everyone remember this sign, cherish and rationally use every drop of water
Spatial distribution of water resources in my country
Uneven
More in the east and less in the west
More south and less north
Build a reservoir--solve the problem of uneven time distribution of water resources
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