80年代黄河中游降雨特点及其对入黄沙量的影响

Characteristics of Precipitation in the Middle Yellow River and Its Effects on Sediment Entering into the Yellow River in 1980's

80年代黄河中游平均年降水量为464mm,是近40年来降水量最少的10年,尤以7～8月降水量减少最多。受夏季风和地形差异的影响,主要少雨区在北中部的河龙区间。正是由于主要产沙区特别是河龙区间大、暴雨的显著减少,导致该区间入黄沙量锐减。

The average annual precipitation in the middle Yellow River was 464mm in 1980's, which is the least in the last 40 years, especially the precipitation is mostly reduced in July and August. The area of little rainfall is mainly located in the north and middle region of He-Long reach due to the effects of summer monsoon and variations of topography. It is just the cuase resulting the amount of sediment entering into the Yellow River from that reach sharply reduced that heavy rainfall and rainstorms were remakably reduced in the main sediment yield area, esoecially in He-Long reach.