20 17 what are the causes of the rainstorm in the south and the drought in the north, and the significance of the south-to-north water transfer project?

20 17 causes of heavy rain in the south and drought in the north

Recently, the subtropical high is located in the north and west, with cold air moving south from the middle and high latitudes and warm and humid airflow in the southwest being more active. In this way, the cold and warm air flows meet for a long time in the middle and lower reaches of the Yangtze River and its south area, which is easy to form continuous rainfall. This subtropical high has caused long-term drought in some areas in the north. In addition, this year is a strong El Ni? o year, and the abnormal seawater temperature in the Pacific Ocean will change the atmospheric circulation, leading to long-term rainfall in one area and long-term drought in another.

"South-to-North Water Transfer Project" is a national strategic project aimed at alleviating the shortage of water resources in northern and northwestern China. Is to transfer a part of the rich water resources in the Yangtze River Basin of China to North China and Northwest China.

Social significance:

1 to solve the water shortage problem in the north;

2. Increase the carrying capacity of water resources and improve the efficiency of resource allocation;

3. Make northern China a water-saving and pollution-proof society with reasonable allocation of water resources and good water environment;

4. It is beneficial to alleviate the restriction of water shortage on the urbanization development in the northern region and promote the local urbanization process;

5. Ensure the perennial navigable water source of Jining-Xuzhou section of Beijing-Hangzhou Canal. The two major commodity grain bases in western Shandong and northern Jiangsu have been consolidated and developed.

Economic significance:

1, providing guarantee for the economic development in the north;

2. Optimize the industrial structure and promote the strategic adjustment of the economic structure;

3. Improve the potential productivity and form economic growth by improving water resources conditions;

4. Expand domestic demand, promote harmonious development and increase GDP.

Ecological significance:

1, improve the ecological environment in Huang-Huai-Hai area;

2. Improve the quality of local drinking water in the north, and effectively solve the groundwater quality problems caused by natural reasons in some parts of the north, such as high fluorine water, brackish water and other water sources containing substances harmful to human health;

3. It is beneficial to replenish groundwater in the north and protect local wetlands and biodiversity;

4. Improve the environment deteriorated by water shortage in the north;

5. Greatly improve the ecological environment conditions in the northern region, especially the water resources conditions.