黄河北干流与渭河相遇洪水分析

黄河北干流与渭河位于黄土高原，暴雨是洪水的重要成因．本文分析了近２０００年的历史资料，提出该地区的洪水具有周期性，１９世纪洪水达到高峰，２０世纪洪水规模有所降低，并分析了黄河北干流与渭河及其支流径、洛河洪水相遇问题：四河相遇的概率很小，多形成特大洪水，两河相遇是较常发生的事件，多形成中等以下洪水。三门峡水库的淤积使该地区洪水灾害加剧．同时还分析了该地区洪水对黄河下游洪水的影响。

ANALYSIS ON SIMULTANEOUS OCCURRENCE POSSIBILITY OF FLOODS IN THE BEIGANLIU OF YELLOW RIVER AND WEIHE RIVER

Beiganliu of Yellow River and Weihe river lied in the plateau area.The rains storm is the important factor for flood.This paper studied historical flood data about 2000 years,which showed periodic occurrence of concentration of big floods.The analysis showed that the 19th century is a period of frequently occurrence of floods and the 20th century is the low period.According to the analysis of the floods for the four rivers, the meeting possibility of the four river floods at the same time is small,however easily formed extraordinary flood,two river floods collide frequently and easily formed moderate or small flood.Because of the siltation of Sanmen Gorge Reservoir,flood disasters are aggravated.Analysis on the floods impacts on the lower reaches of Yellow River is also made.