Three Gorges Dam and Other Yangtze River Dams Spill Water

Three Gorges Dam June 2020

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June 30, 2020

Since the start of Asia’s summer season monsoon season on June 1, 2020, extreme rains has actually pressed lakes and rivers to tape high levels in China. Flooding within the Yangtze River Basin, in specific, has actually displaced countless individuals.

The Yangtze River is Asia’s longest, winding 6300 kilometers (3,900 miles) through China. Together with its network of tributaries and lakes, the river system has actually gone through substantial advancement as a method to produce power, shop water for drinking and watering, and control flooding. Today the watershed is dotted with 10s of countless tanks, and its rivers are covered by many dams.

Gezhouba Dam June 2020

June 30, 2020

During the 2020 summer season monsoon, floodwater was being held, or “absorbed,” by 2,297 tanks in the area, consisting of the one behind Three Gorges Dam. In an effort to manage the circulation of floodwater, dam operators can release water through spillway gates.

Those gates were open when these images were gotten on June 30, 2020, with the Operational Land Imager (OLI) on Landsat 8. The images are composites of natural color and shortwave infrared to much better identify the water. Note how the gush streaming through the spillways modifications how the water downstream shows light, making it appear whiter.

The image at the top of this page reveals water moving through evictions of Three Gorges Dam. Spanning a sector of the Yangtze River in main China’s Hubei Province, the dam is 2300 meters long and stands 185 meters high. The 2nd image reveals the smaller sized Gezhouba Dam, situated about 26 kilometers (16 miles) southeast from Three Gorges. This dam likewise appeared to have its spillway gates open.

Yangtze River June 2020

June 30, 2020

When these images were gotten in June, the waterways were attempting to manage the very first significant flooding of the monsoon season. A 2nd wave of extreme flooding, described by regional media as the “No. 2 flood,” struck the area in July. Between and throughout these flood occasions, constant modifications are made to the quantity of tank outflow streaming through evictions.

According to the Three Gorges Corporation, the water level in the tank reached a record high flood season level of 164.18 meters on July 19. The previous high level reached throughout the flood season because the dam ended up being totally functional in 2012 was 163.11 meters. The tank is developed to hold an optimum water level of 175 meters.

NASA Earth Observatory images by Joshua Stevens, utilizing Landsat information from the U.S. Geological Survey.

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