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How does erosion on the Loess Plateau affect the Yellow River?
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Yellow River
The Yellow River (Huang He) basin and the Yangtze River (Chang Jiang) basin and their drainage networks.
The Loess Plateau is a critical factor in the hydrology of the Yellow River, as the river cuts through its thick, loose deposits of wind-deposited soil known as loess. This process makes the region one of the most highly eroded landscapes in the world.12
The erosion of this plateau significantly impacts the river in the following ways:
- High Sediment Load: The river carries the highest concentration of sediment of any river in the world, much of which is loess washed away from the plateau. This silt is easily transported due to the steep slopes, rapid currents, and lack of vegetation in the area.3
- Channel Instability: In the middle basin, this erosion contributes to the instability of the riverbed. As the river reaches the North China Plain, its velocity decreases, causing the suspended silt to settle.13
- Elevated Riverbed and Flooding: The deposition of this massive sediment load builds up the channel bed on the plain. This artificial elevation of the riverbed necessitates the construction of levees to contain the water, which ultimately makes flooding events more dramatic and destructive when breaches occur.13
Efforts to control this erosion through afforestation and terracing have been implemented to reduce the downstream silt load.24