Loess turned China’s mother river dangerously yellow
The Yellow River, or Huang He, stretches about 5,464 kilometres—China’s second-longest, the world’s sixth—with a basin near 795,000 square kilometres. Fine loess mud dyed it yellow between 367 BC and AD 165; the same silt raises the bed and powers catastrophic floods.
From the Bayan Har Mountains it swings through the 1,500-kilometre Ordos Loop before cutting east to the Bohai Sea. Traditional history plants the Xia dynasty on its banks around 2100 BC after flood-fighting unions recorded later by Sima Qian. Today some 120 million live in the basin and over 420 million in provinces that drink from it; the basin holds thirteen percent of China’s farmland yet only about two percent of national runoff.
Once simply ‘the River,’ it earned murky and yellow epithets after Yumenkou watchers saw clear water turn muddy. Levees built ever higher sometimes worsened disasters: when water topped the banks it could not drain home, drowning plains for years. Sediment load has fallen five-fold since the 1970s as flow declined, rewriting both fertility and risk.
Between 595 BC and 1946 the river is reckoned to have flooded 1,593 times and shifted course 26 times, nine of them severely, and breaches could move its mouth by as much as 480 km. Floods have killed over a million people more than once, and the 1887 disaster alone took somewhere between 900,000 and 2 million lives. Collapsing ice dams in Inner Mongolia caused 11 major floods in the past century, so aircraft now bomb the ice before it builds up. From 1128 to 1855 the river ran south to join the Huai and reach the Yellow Sea instead of the Bohai.
People have also turned the river into a weapon: in 923 the Later Liang general Duan Ning broke the dikes and drowned about 2,600 km² in a failed bid to shield his capital. A breach at Henglong in 1034 split the channel in three, and the Song spent five years and, in one year alone, 220,000 tons of wood and bamboo trying to restore the old course before giving up in 1041. Other peoples name it differently: Mongolian speakers call it the Queen River, the Kul Tigin stele the Green River, and Tibetans the River of the Peacock.
Source: Yellow River
