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泾河是渭河的第一大支流,也是渭河下游和黄河潼关以下洪水的主要来源,洪枯变化量大,通过采集泾河S-剖面27个河漫滩样品,用Mastersizer2000型激光粒度仪对其0.1~1 000μm范围内的粒度进行分析,并根据Folk和Ward的概率公式计算出各种粒度参数。结果显示,泾河S-剖面沉积物指示了至少8次洪水的信息。剖面粒度组成以粉砂为主,其中粗粉砂不仅含量高,而且含量变化很好的对应了洪水变化阶段,可以作为泾河洪水大小的标志性粒级。
Jing River is the first major tributary of the Weihe River and also the main source of floods below the Weihe River and the Yellow River. The amount of floodwater fluctuates widely. By collecting 27 floodplain samples from the Jinghe S-profile and using the Mastersizer2000 laser particle size analyzer, 1 000μm range of particle size analysis, and according to Folk and Ward’s probability formula to calculate a variety of particle size parameters. The results show that the Jinghe S-section sediments indicate at least 8 floods. The grain size of the profile is mainly composed of silt, of which coarse silt is not only high in content but also good in content, which corresponds to the stage of flood variation and can be used as the landmark particle size of Jinghe flood.