Research on Overbank Flood Sediment Concentration and Its Gradation Changes of Lower Yellow River
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摘要: 通过模型试验,研究了黄河下游夹河滩到高村断面河段漫滩洪水含沙量及颗粒级配的沿程变化规律。结果表明:(1)各种流量条件下,主槽含沙量沿程增大,但差别较大。(2)漫滩挟沙水流在滩区含沙量沿程衰减,在生产堤内及滩面衰减幅度较大,在二滩衰减幅度较小;同时,漫滩挟沙水流中的泥沙颗粒在落淤过程中有明显的分选作用。(3)二滩沿程含沙量衰减率与大河洪峰流量有关,流量越小,含沙量衰减越快。Abstract: With the model test,this paper researches overbank flood sediment concentration and its gradation change rules from Jahe beach to Gao village river section of lower Yellow River.The test shows that: Firstly,the more overbank sediment laden flow sediment concentration the main channels have,the more differences they gets.Secondly,on the beach area,the less the sediment concentration becomes,the larger the attenuation range inside of dike and of beach surface becomes.At the same,the sediment particles of overbank sediment laden flow has the screening function obviously during the silting process.Thirdly,the smaller the river peak flow becomes,the more quickly the sediment concentration attenuates along Ertan.
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[1] 潘贤娣,李勇,张晓华,申冠卿,等.三门峡水库修建后黄河下游河床演变[M].郑州:黄河水利出版社,2006. [2] 张红武,江恩慧,白咏梅,等.黄河高含沙洪水模型的相似率[M].郑州:河南科学技术出版社,1994.
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