泾河近代洪水沉积物粒度特征分析

摘要/Abstract

摘要：

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Mastersizer 2000型激光粒度仪对其0.1~1 000 μm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。

关键词: 泾河, 沉积物, 粒度, 洪水

Abstract:

Jinghe River is the biggest branch of Weihe River and also the main flood source of lower reaches of the Weihe River and the Tongguan downward reaches of the Huanghe River. River runoff greatly varies in flooding and low-water seasons. We have sampled 27 samples in Jinhe S-Profile, and have analyzed the grain-size characters within 0.1~1 000 μm by using the Mastersizer-2000 Laser Granularity Instrument, further have calculated the various grain-size parameters according to probability formula of Folk and Ward. The results suggest that the Jinghe River has at least experienced 8 times of flooding events. The main sediment in S-Profile is silt, in which coarser silt (32~63 μm) has the highest content and can be used as the indicating of flood scale due to its content changes well corresponding to flooding stages. Suggested by the depositional rhythm of coarser silt the scale of the 8 flooding events follows the order: the fourth>the second>the sixth>the first>the eight>the fifth>the third>the seventh.

Key words: grain-size analysis, sediments, Jinghe River, flooding

中图分类号:

P534.63

史兴民;师静;万正耀. 泾河近代洪水沉积物粒度特征分析[J]. 中国沙漠, 2009, 29(2): 359-364.

SHI Xing-min;SHI Jing;WAN Zheng-yao. Analysis on the Grain-size Characteristics of Recent Floor Sediments of Jinghe River[J]. JOURNAL OF DESERT RESEARCH, 2009, 29(2): 359-364.

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