黄河下游典型年份水沙条件与河床演变特征分析

Analysis for Water and Sand Conditions of Lower Yellow River in Typical Year and Its Evolution Characters of River Bed

文章采用实测资料分析方法,研究黄河下游典型年份的水沙条件与河床演变特征。研究结果表明:黄河下游2006年是典型枯水枯沙年份,年水沙量与多年同期相比均偏少。全年洪水过程仅2场,分别是6月小浪底水库调水调沙洪水和8月小浪底水库异重流排沙产生的"06·8"洪水。黄河下游河道2006年利津以上冲刷1.318亿m^3,冲刷集中在夹河滩以上,非汛期冲淤沿程分布具有"上冲下淤"的特点。

Observed data analysis method was adopted to study the water and sand conditions on lower Yellow River in typical years and its characters of river bed evolution. The results show that 2006 is the typical low flow year and dry sand year for the Yellow River,and mean annual quantities of water and sand are less than the same period. Only two flood processes for the whole year,there were respectively water and sand transportation flood of the Xiaolangdi reservoir in June and ＂ 06. 8 flood ＂ caused by sediment flushing through density gravel flow in the Xiaolangdi reservoir. There were 0. 1318 billion m-3 scoured on the upper Lijin of the river course on the downstream of Yellow river in 2006,concentrating on the upper Jiahe alluvial plain,and silt scouring was characterized as ＂ scouring on the upstream and silting on the downstream＂ along the river not in the flood period.