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Due to the high level of pollution, the Yellow River has changed color.

According to the test, due to the repeated prohibition of sewage discharge, the pollution of the Yellow River has intensified and the water quality has deteriorated sharply.

In the middle of the autumn flood in 2003, the Yellow River Water Conservancy Commission adjusted the operation of the Xiaolangdi Reservoir to hold and store water, and for the first time among major rivers in China, the flood water was recycled, and nearly 8 billion cubic meters of precious water was stored for the downstream of the Yellow River to prevent and supply water. However, according to the data of the Yellow River Basin Water Environment Monitoring Center, the water quality of Xiaolangdi Reservoir is deteriorating, and the water quality category has been reduced from three at the beginning of this year to four (GB3838-2002 surface water environmental quality standard), and the main pollutant ammonia nitrogen index has risen rapidly from about 0 7 milligrams in January to about 1 2 milligrams at present, and the highest value has reached about 1 4 milligrams of liters, which is 0 4 times more than the water quality standard of the three categories. The total nitrogen concentration reached 6 milligrams, well above the total nitrogen level at the beginning of June 2003, when eutrophication occurred in the reservoir.

Experts say that if pollution is not controlled as soon as possible, ignoring the continuous flow of inferior water sources into the Yellow River, and as the temperature gradually rises, algae bloom in the reservoir will bloom, and it will not be long before there will be a "water bloom" phenomenon in the Xiaolangdi Reservoir, and at that time, the water that has been accumulated in a reservoir will become unusable sewage at all, seriously endangering the water supply security of the urban and rural population in the lower reaches of the Yellow River.

In recent years, there have been many water pollution incidents in the Xiaolangdi Reservoir of the Yellow River. At the beginning of 2003, the section of the Yellow River from Tongguan to Xiaolangdi had the most serious pollution since the measured record, and the seventh diversion of the Yellow River to Tianjin was forced to stop. In September 2003, in order to ensure the quality of water supply, organized by the Ministry of Water Resources and the State Environmental Protection Bureau, the Yellow River Basin Water Resources Protection Bureau took the lead, and organized the environmental protection and water conservancy departments of Shanxi, Shaanxi and Henan provinces to prepare the "Water Pollution Control Plan during the Yellow River and Tianjin". The water quality of the Shandong Weishan diversion sluice is basically maintained at two to three types of water.

However, with the completion of the work of diverting the Yellow River to Tianjin, the binding force of this plan weakened, and the water of the Yellow River immediately "changed color".

The Yellow River was cut off.

Since 1972, the Yellow River has often been cut off. There are many reasons for the interruption of the flow, which can be summarized as follows: 1

Global warming - With the intensification of global warming in recent years, on the one hand, the evaporation of rivers has increased significantly, and on the other hand, the melting of glaciers in the upper reaches of spring and summer absorbs a large amount of heat, resulting in lower than usual local temperatures in the interior, reducing the temperature difference between the inland and the ocean, and then causing the monsoon to weaken, and the lack of water vapor brought by the monsoon from the sea surface to the inland. Although global warming has increased the flow of upstream water by melting glaciers, it has not offset the effects of increased evaporation and weakening of the monsoon. As a result, the amount of water in the middle and lower reaches is decreasing year by year.

2.Plant destruction - the vegetation in the Loess Plateau is seriously damaged, the land lacking vegetation conservation is gradually desertified, the evaporation becomes high, the land is dry, and the groundwater needs to be continuously absorbed and flowed through the river to replenish. 3.

Backward irrigation methods -- most of the middle and upper reaches of the Yellow River flow through economically underdeveloped areas and poor areas, lacking water-saving irrigation technology and funds, and most of them are flooded, and the Yellow River is seriously wasted. The precipitation rate in the upper reaches is very small in the arid and semi-arid areas, and the middle reaches are the main recharge areas, but the soil erosion is serious and the seasonal changes are large, and the downstream basin is small in area and has little recharge. The population in the basin is growing rapidly, and the population growth rate is far outpacing the food growth rate; In recent decades, with the development of society, the water consumption of industries and cities along the Yellow River has been increasing, and the irrigation area of the Yellow River has been expanding. The regulation capacity of reservoirs is low, and the management of water resources is not uniform; The water fee is low, and the low water price cannot arouse people's awareness of water conservation, and the waste of water in industry and agriculture is huge; Environmental pollution has dramatically reduced the utilization rate of the Yellow River's water. Factories along the river discharge too much wastewater.

During the Ninth Five-Year Plan period, the management of the "three rivers and three lakes" only opened the prelude to the prevention and control of water pollution in our country. While bringing the "three rivers and three lakes" under control on a large scale, it must be noted that the pollution problem of the Yellow River and the Yangtze River has also reached a level where it is indispensable to deal with them. The Yellow River, the cradle of the Chinese nation, has nurtured mankind and brought disasters to mankind countless times.

Nowadays, due to the force of human activities, the environmental problems of the Yellow River are becoming more and more serious. In 1999, 70% of the 114 key monitoring sections in the Yellow River basin were classified as Class V and Class V water bodies, respectively, and the pollution of the main tributaries of the Yellow River was even more serious, and the pollution of the Yellow River mainly came from the tributaries. At present, the Yellow River has a small amount of water, weak self-purification capacity, and the water environment is in crisis.

In the large-scale development of the western region, the economic development of the Yellow River valley will enter a period of relatively rapid growth. Water pollution in the Yellow River will inevitably make water shortages along the banks worse.

Pollution of the Yellow River.

Due to the aggravation of industrial pollution and sewage and agricultural water pollution, the Yellow River Basin Water Resources Protection Bureau organized an expert group to conduct a quantitative analysis of the status and hazards of water pollution in the Yellow River, and found that nearly 40% of the water quality of the main stream of the Yellow River is inferior to Class 5, and the water function has basically been lost. With the economic development, the discharge of waste water in the Yellow River basin has doubled compared with the 80s of the last century, reaching 4.4 billion cubic meters, and pollution incidents continue to occur. Most of the tributaries in the upper reaches of the Yellow River are polluted to varying degrees, while the water quality of almost all the tributaries in the middle and lower reaches has been in a state of inferior class 5 for many years, and the tributaries have become "sewage rivers".

There are two types of pollution in the Yellow River: natural and man-made.

Natural pollution is mainly due to the serious soil erosion caused by the middle and upper reaches of the Yellow River flowing through the Loess Plateau, and a large amount of sediment is poured into the Yellow River every year, resulting in an increase in the lead rent of suspended solids in the water and an increase in turbidity.

The water quality of the Yellow River deteriorates due to the untreated domestic sewage and garbage of residents on both sides of the Yellow River and its main tributaries, and the most important is the large amount of sewage discharged into the water by the chemical plants along the banks every year.

There are two types of pollution in the Yellow River: natural and man-made.

The pollution is mainly due to the serious soil erosion caused by the middle and upper reaches of the Yellow River flowing through the Loess Plateau, and a large amount of sediment is poured into the Yellow River every year, resulting in an increase in suspended solids and turbidity.

The human factor is mainly due to the untreated domestic sewage and garbage of residents on both sides of the Huangzao Corough River and its main tributaries, and more importantly, the large amount of sewage discharged into the water body by the chemical plants along the banks every year, resulting in the deterioration of the water quality of the Yellow River.

Please help Yellow River!

The last one should not be removed, because it is an expository text, and the wording should be precise, and it has become the main discharge channel for agricultural sewage and domestic sewage in the vicinity, and it is not the only one.