Aerial photo taken on Aug. 4, 2018 shows the Hukou Waterfall of the Yellow River in the flood season in Jixian County of Linfen City, north China's Shanxi Province. (Xinhua/Liu Hongda)

Aerial photo taken on Aug. 4, 2018 shows the Hukou Waterfall of the Yellow River in the flood season in Jixian County of Linfen City, north China's Shanxi Province. (Xinhua/Liu Hongda)

Aerial photo taken on Aug. 4, 2018 shows the Hukou Waterfall of the Yellow River in the flood season in Jixian County of Linfen City, north China's Shanxi Province. (Xinhua/Liu Hongda)

Aerial photo taken on Aug. 4, 2018 shows the Hukou Waterfall of the Yellow River in the flood season in Jixian County of Linfen City, north China's Shanxi Province. (Xinhua/Liu Hongda)