The sediment load of major rivers in China has decreased by over 2/3 compared to more than 20 years ago

Tech 2023-07-08 05:08:36 Source: Network

Recently, the Ministry of Water Resources released the 2022 China River Sediment Bulletin. According to the bulletin, the total annual sediment discharge of representative hydrological stations in China's major rivers in 2022 has shown a trend of decreasing in the past 10 years

Recently, the Ministry of Water Resources released the 2022 China River Sediment Bulletin. According to the bulletin, the total annual sediment discharge of representative hydrological stations in China's major rivers in 2022 has shown a trend of decreasing in the past 10 years.

The 2022 China River Sediment Bulletin recently released by the Ministry of Water Resources shows that. In 2022, the total measured runoff of representative hydrological stations of major rivers in China was 1332 billion cubic meters, which is 7% lower than the average annual runoff for many years; The total annual sediment discharge of representative hydrological stations in major rivers is 390 million tons, which is 73% lower than the average annual sediment discharge for many years.

In recent years, China has vigorously implemented measures such as integrated protection and systematic management of mountains, rivers, forests, fields, lakes, grasslands, and sand. Compared to before 2000, the overall sediment load of major rivers in the country has decreased by more than two-thirds.

Wang Yangui, Senior Engineer of China Academy of Water Resources and Hydropower Research:From the perspective of spatial distribution of water and sediment in different rivers, the annual average sediment transport of the Yellow River and Yangtze River representative stations accounts for 64% and 24% of the total amount, respectively, while other rivers account for relatively small proportions.

The sediment load of major rivers has decreased by over 2/3 compared to over 20 years ago

The communique released this time shows that compared to before 2000, the overall sediment load of major rivers in China has decreased by more than two-thirds.

The sediment condition of rivers not only affects the development and evolution of the river itself, but also reflects the environmental characteristics of the basin, the degree of soil erosion, and the impact of human activities. River sediment issues are important factors that must be considered in planning, flood control, water resource utilization and protection, and soil and water conservation.

Guo Qingchao, Director of the Sediment Research Institute of the Chinese Academy of Water Resources and HydropowerFor example, more than 20 years ago, the major rivers in China were mainly dominated by sediment deposition, especially in the lower reaches of the Yellow River. The annual sedimentation raised the riverbed by about 5 to 10 centimeters, which put great pressure on the flood control of the Yellow River.

In recent years, China has vigorously implemented measures such as integrated protection and systematic management of mountains, rivers, forests, fields, lakes, grasslands, and sand. Up to now, the sediment content of major rivers has undergone significant changes.

Guo Qingchao, Director of the Sediment Research Institute of the Chinese Academy of Water Resources and HydropowerOne is the sediment reduction effect of soil and water conservation in the watershed. The second one is located inside the river channel, as many reservoirs have been built, and these sediments are trapped inside the reservoirs, which is very beneficial for reducing sedimentation in the downstream river channel.

Experts say that rivers like the Yellow River in China, carrying a large amount of washed sediment when flowing through the Loess Plateau, have the highest sediment content in the world. In the 1990s, China built the Xiaolangdi Dam in the middle reaches of the Yellow River. Through 22 years of water and sediment regulation, the flow capacity of the lower Yellow River has significantly improved, and the flood level of the same flow has dropped by about 3 meters, effectively reducing the flood control pressure of the lower Yellow River. (CCTV News Client)

Source: CCTV News Client

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