High score: Why can this river flow continuously all year round?

First of all, we must understand a concept, what is river water supply? Since you don't want to copy and paste, I will simply say that there are four kinds of river water supply: rainwater supply, ice and snow melting water supply, groundwater supply and mixed supply.

It can be said that all rivers are mixed recharge, but the main recharge methods are different.

Moreover, this centralized recharge method is difficult to distinguish. For example, if it rains in the sky, and the rain seeps into the ground, it becomes groundwater. If there is a low-altitude river next to it at this time, the groundwater will stay in the river. At this time, you can't tell whether the river is a groundwater recharge or a rainwater recharge.

For example, Tarim River is a typical ice-snow meltwater supply, which is often cut off because of insufficient water resources.

The Pearl River and Huaihe River are typical rainwater recharge areas. There is no mention of the Yangtze River and the Yellow River here, because the sources of the Yangtze River and the Yellow River are supplied with melted ice and snow.

What is said here is only their main mode of supply.

Another way of recharge is groundwater recharge. Groundwater recharge plays a buffering role in many cases. If there are more rivers, they will seep into the ground. When there are few people in the river, groundwater will be replenished into the river.

After talking about river water supply, let's talk about precipitation. I think you should also look at the weather forecast. The weather forecast often says how much precipitation there is somewhere.

For example,/China/gedi/2010/0613/257590.html.

According to this news, the precipitation in Nanping, Sanming, Longyan and the northwest of Ningde will exceed 150 mm, and some counties and cities in Sanming and Nanping can exceed 250 mm.

Talking about Sanming City

Fuzhou in the east, Quanzhou in the south, Longyan in the west, Nanping in the north and Jiangxi in the northwest. It is more than 230 kilometers wide from east to west and 180 kilometers long from north to south. The total land area is 22,900 square kilometers. /view/27756.htm？ fr=ala0_ 1_ 1#2

The average precipitation in Sanming is 200mm, which is equal to 200mm times 22,900 square kilometers. About 460 million cubic meters. What concept? Suppose you take a bath with 0. 1 m3 of water, then these water structures will be washed 4.6 billion times.

Think about how long it will take for the water to run out.

Speaking of this, we should also introduce two other concepts, river runoff and evaporation.

Annual runoff is the amount of water that a river flows into the sea in one year, and the annual inflow of the Yangtze River reaches 1 trillion cubic meters.

Evaporation is how much water turns into steam and evaporates into the atmosphere.

Whose consumption are these two quantities?

I'm a little tired.

Clear your mind. If you have to calculate, you can check the annual precipitation of a river basin (preferably a river with rain compensation) and find out the evaporation in the basin. The difference between these two quantities will certainly not be too big. The difference obtained by subtraction, multiplied by the basin area, is roughly equal to the annual runoff of the river.

Of course, there will be errors because of groundwater and other factors.

Having said that, I typed it word by word.

I wonder if it will help you.

If you really want to study this aspect, I suggest you read Principles of Hydrology and Hydrology and Water Resources. It's very detailed and thorough.

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There are e-books to download here. .

Well, I'm going to eat. I tried to answer so many questions. I'm going to eat.

If you don't understand anything, please add your questions.