Thousands of miles of Huaihe River, the road to the sea is more smooth

The "family" of major water conservancy projects adds new members! On July 30, the Huaihe River in Huai'an and Yancheng, Jiangsu, started the second phase of the sea water channel project. The total investment of the project was 43.8 billion yuan. Later, the ability of the Huaihe River will be greatly enhanced.

It originated in Tongbai Mountain District, Henan. The thousands of miles of Huaihe River, which is winding and winding east, will be more unobstructed. At the same time, it will also reduce the pressure of flood prevention and waterlogging in the middle of the Huaihe River, reduce the use of floods around Hongze Lake, improve northern Jiangsu irrigation The drainage conditions in the north of the general canal are of great significance to ensure the economic and social development of the watershed in the future of Hongze Lake's flood dealcies.

Flood prevention is facing bottlenecks, and the Huaihe River needs to expand the scale of floods.

Does Huaihe have no entrance to the mouth? Why build the second phase of the Huaihe River into the seawater?

To clarify these issues, you must "sort out" this special and complicated river in history. The former Huaihe River was originally a river that flows into the sea, moisturizing the land and Ze by the two sides of the strait. However, the "entanglement" of another big river rewritten the appearance of the Huaihe River -the Yellow River, which has repeatedly diversified in history, seized a large amount of sediment in the sea in the Haikou River. Essence The Huaihe River lost its direct entry into the sea, and could only be injected into the Yangtze River via Hongze Lake and entered the sea through the Yangtze River.

But the road to the sea through the Yangtze River is not a frank road. Because the Huaihe River is located in my country's north -south climate, the distribution of precipitation space and space is uneven, and precipitation is concentrated in summer and heavy rain. The Huaihe River has a total length of about 1,000 kilometers. The water system is huge and there are many tributaries, but the total gap is only about 200 meters. In addition, the river is curved and the drainage is not smooth. Essence

In view of this, since the relocation of the Yellow Henan in the 12th century and winning the Huaihai, the drought and flood disasters of the Huaihe River have become increasingly frequent. It was once known as the "most difficult river in China". It is also the first large river that has been comprehensively governed after the founding of New China.

After more than 70 years of management, the flood disaster defense capabilities in the Huaihe River Basin have increased significantly. Among them, the first phase of the Huaihe River entering the sea water channel project and other projects, the flood drainage capacity of the lower reaches of the Huaihe River has been expanded from less than 8,000 cubic meters per second to 15270 cubic meters per second to 18270 cubic meters per second. Flood prevention standards.

"But the scale of the flooding road is still insufficient. The low -level leakage ability of the low water level in Hongze Lake is still the main bottleneck facing the flood prevention of the lower reaches of the Huaihe River." Qiao Jianhua, deputy director of the Ministry of Planning and Planning Department of the Ministry of Water Conservancy, told reporters Insufficient capabilities, in the absence of floods around Hongze Lake, the flood prevention standard for Hongze Lake can reach 100 years of encounters, and it is still not required to meet the 300 -year encounters specified in the national flood control standard. At present, the design flooding ability of the lower reaches of the Huaihe River can only be achieved when the water level of Hongze Lake is high. When the low water level in Hongze Lake, the leakage capacity of the river, entering the sea, and entering the Yi is small, and the flood roads are seriously insufficient.

Therefore, the construction of the second phase of the Huaihe River entering the seawater, expanding the flood discharge of the lower reaches of the Huaihe River, increasing the flood prevention standards of Hongze Lake and the lower reaches of the flood prevention zone, and reducing the pressure of flood prevention and waterlogging in the Huaihe River, which is particularly urgent and necessary. Qiao Jianhua pointed out that the construction of the second phase of the Huaihe River into the seawater is a major measure to realize the Huaihe River Anlan.

Reduce the opening of the flood lagging area, the flood control pressure of the Huaihe River will be reduced

In 2003, the first phase of the Huaihe River entered the seawater was completed, and the torrent of the design line was 2270 cubic meters per second. "The second phase of the project is within the river channel that has been determined and formed in the first phase of the project. By digging the width and digging of Shenhong Road, Pei -high reinforcement embankment, and expanding control hubs, the design routine has expanded to 7000 cubic meters per second. Phase II. After the project is completed, the floods will be further expanded in the lower reaches of the Huaihe River, improving the flood prevention standards and flood storage capacity of Hongze Lake, and accelerating the flood leakage in the middle reaches of the Huaihe River and reducing the pressure of flood prevention in the middle of the Huaihe River. "

As a giant comprehensive use of the plain reservoir in the middle and lower reaches of the Huaihe River, Hongze Lake inherits 158,000 square kilometers of floods in the upper and middle reaches of the Huaihe River. At present, the Hongze Lake flood prevention standard is a 100 -year encounter. If there is more than 100 years of floods in 100 years, it is necessary to adopt very flood division measures, and the downstream areas will suffer to varying degrees of floods. If a flood is encountered in 300 years, the maximum flow of Hongze Lake's lake is 25,700 cubic meters per second, exceeding 41%of the total leakage capacity of the status quo, and a very popular flood will reach 3.83 billion cubic meters. Baibao Lake, Lixia River and other regions will face flooding risks, and direct economic losses will be estimated to reach 270 billion yuan.

"It can be said that if there is no Huaihe River entering the second phase of the seawater, once the Hongze Lake happens in 300 years, the economic and social losses will be unbearable to the downstream." Director He Xilong introduced.

Moreover, the current design flood prevention standards of Hongze Lake can only be achieved in the flood degradation area around Hongze Lake. After the completion of the second phase of the Huaihe River into the seawater, it can not only help downstream areas to resist the general floods and reduce disaster losses, but also reduce the probability of flood degradation area around Hongze Lake, which can be used or not in the floods.

The Ministry of Water Resources estimates that after the completion of the second phase of the Huaihe River entering the seawater, once a hundred years of flood occurred, the highest flooding position of Hongze Lake will be reduced by 0.77 meters compared to the current situation. The area of ​​440 square kilometers, the affected population will also be greatly reduced. In order to improve the grade of the Huaihe River, and to enhance capacity creation conditions

In addition to improving the flood prevention standards of Hongze Lake and reducing the pressure of flood prevention in the Huaihe River, the second phase of the Huaihe River entering the seawater can also create conditions for the construction of the Huaihe River -II channel.

It is understood that the middle and upper reaches of the Huaihe River are important mineral resources in my country, and coal, iron ore, and cement are rich in reserves. The future development space of the port of the central part of Jiangsu Province is large. In the long run, the demand for water transportation in Henan, Anhui and Jiangsu along the Huaihe River has a large room for growth.

Some experts pointed out that the construction of the second phase of the waterway project to open the lane of the Huaihe River to achieve an effective connection with the Harbor, which will significantly improve and enhance the shipping function of the Huaihe River Basin, promote the coordinated development of the area along the Huaihe River. Belt construction provides important support.

At present, from the perspective of the channel level, the current status of the Huaihe River Mansion on the Hongze Hunan Line is basically reaching the level III standard; the current status of the section of the northern Jiangsu irrigation canal (Gao Liangzhang ship to the Beijing -Hangzhou Canal) basically meets the level III standard; Dajin -level standards; Tongyu canal section is a III to ⅳ channel; the irrigation section is a Class III and above channel; the Huaihe River is currently not navigable.

"The second phase of the Huaihe River entering the seawater is in Jiangsu, and the benefits are in the entire basin. Jiangsu will adhere to the collaborative governance of the basin, and build the second phase of the sea waterway project into a safe waterway in the Huaihe River Basin, the ecological green track of the JAC plains, and the golden channel of the revitalization of northern Jiangsu. . "Chen Jie, director of the Jiangsu Provincial Department of Water Resources, said that after the implementation of the second phase of the Huaihe River, the river channels are wide and the water depth is excellent, and the depth of the water depth is appropriate. It is of great significance to improving the grade of the Huaihe River to the coastal channel and increasing the transportation capacity.

(Reporter Chen Chen)

Link

The flood of the "100 -year encounter" does not appear every 100 years

The "one hundred years of encounter" flood refers to the average possibility of this magnitude of the flood for a long time. For the specific 100 years, it may appear more than once, or it may not happen once. For many years, it is called a reproducible period in professionalism. According to the data of the past measured or survey, the reappearance period obtained by statistical analysis and calculation, while indicating the frequency of floods, it can also be used to measure the size of a flood.

(Chen Chen compiled)

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