2. The interruption of the Yellow River is mainly caused by human activities. The destruction of the ecological environment and the unreasonable development and utilization of water resources in the Yellow River basin are the main reasons for the interruption of the Yellow River.
Historically, the Yellow River Basin was once a densely forested area. However, for thousands of years, human activities have destroyed the natural ecology, forests have been cut down, grasslands have been reclaimed, barren hills and mountains abound, soil erosion is serious, and water storage and conservation capacity has been greatly reduced. The flood is fierce in rainy season, the soil is dry in dry season, and the spring is exhausted.
People used to think that we should make full use of this river and not let it flow into the sea in vain. It is under the guidance of this idea that a large number of water diversion projects do not consider water saving, and a large number of rivers are wasted. The unreasonable impoundment of many reservoirs in the upper and middle reaches further aggravated the shortage of water resources in the lower reaches.
3.
The production of domestic sewage and domestic garbage is increasing day by day, which exceeds the total discharge of industrial wastewater and waste residue and becomes the primary factor of pollution in the Han River. In 2004, the total discharge of domestic sewage in Hanzhong section of Hanjiang River reached more than 409 10000 tons (more than twice the industrial discharge), the discharge of COD in sewage was 16643.5 tons, the discharge of ammonia nitrogen was 1925.4 tons (more than four times the industrial discharge), and the discharge of domestic garbage was more than 500,000 tons, making it water. Except for the town sewage treatment plant and medical waste treatment center with a daily treatment capacity of 50,000 tons in Hanzhong City, the garbage treatment plant is under construction at home and abroad, and there are no sewage treatment plants and garbage treatment plants in other 10 counties and 25 towns along the Yangtze River.
4. The ecological environment is very poor. 19 17 species, the problem of large animals is unclear.
5. Yellow River carp and Yellow River turtle are special products.
6. You can board the ship, but only with small tonnage and individual routes. The Yellow River is often cut off, and its water volume is small (smaller than that of the Yangtze River and Pearl River). Although it can also be used for inland transportation, it is by no means the most important thing in China, but the Yangtze River is.
7. Because the source of the Yangtze River is glaciers, the water flow will not be interrupted. However, soil erosion will only raise the riverbed of the Yangtze River, not cut it off, but only make its water as turbid as the Yellow River.
The Yangtze River is the largest river in China, and its water resources account for 35% of the whole country. The Yangtze River Basin is one of the fastest growing areas in China. With the development of Pudong, the construction of the Three Gorges Project and the implementation of the South-to-North Water Transfer Project, the water resources of the Yangtze River are playing a more important role in China's economic construction. Protecting the water resources and ecological environment in the Yangtze River basin is of great significance not only to the economic and social development of the Yangtze River basin, but also to the economic and social development of North China, Beijing, Tianjin and even the whole country. With the rapid development of industry and agriculture in the basin and the continuous improvement of people's living standards, on the one hand, the sewage discharge is increasing, on the other hand, the requirements for water quality are getting higher and higher, and the contradiction of water pollution in the basin is becoming increasingly prominent. People pay more and more attention to the quality of water resources in the Yangtze River. There may be a big flood in the Yangtze River basin this year.
According to the latest forecast and analysis of meteorological and Yangtze River water conservancy departments, there may be a big flood in the Yangtze River basin this year. The person in charge of the Yangtze River Flood Control and Drought Relief Headquarters recently said that the flood control situation in the Yangtze River this year is not optimistic, so we should be highly vigilant.
According to reports, the main climatic characteristics affecting the drought and flood trend in the Yangtze River basin this year are that the weaker "El Ni? o events" occurred in August last year and February this year respectively; From the end of last year to February this year, the Qinghai-Tibet Plateau was snowy, the temperature in China was high, and the precipitation in the Yangtze River basin was high. According to the main climate characteristics and the current climate background, the Hydrology Bureau of the Yangtze River Water Conservancy Commission of the Ministry of Water Resources made a comprehensive forecast of the drought and flood trend in the Yangtze River Basin during the flood season this year: from May to June, the rainfall in the Yangtze River Basin was generally normal; During the main flood season from June to August, the rainfall in the upper reaches of the Yangtze River is basically normal, with more in the middle and lower reaches, and obviously more near the main stream of the middle reaches, and there may be concentrated rainfall in some areas of the basin.
The head of the Yangtze River Defense General pointed out that these meteorological and hydrological characteristics are very similar to 1998. There has been no flood in the Yangtze River for many years, and last year it encountered a rare low water level. According to the law of flood occurrence, the possibility of basin flood in the Yangtze River is increasing this year.
9. In 2006, there were almost none. At the end of 2006, it seems that scientists from all over the world organized a relatively large-scale investigation together. After 39 days of investigation on the Yangtze River, no trace of baiji was found. After investigation by foreign experts, it is claimed that the baiji is probably the first whale to be extinct by humans in history.
That's all I remember. Give me some points! ! ~~~~~