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前言 黄河上游的水文有许多独特之处。它的源地一带比较湿润,水量较丰,却又不远千里蜿蜒曲折地把水送往我国北部的最干旱地区,开辟了塞北江南的广大宁蒙灌区。它的径流
Introduction Hydrology in the upper reaches of the Yellow River has many unique features. Its source area is relatively moist and abundant in water. However, it twists and turns to the most arid region in northern China and opens up the vast Ningmeng Irrigation District in southern Saibei. It’s runoff