Grain Size Cycle Characteristics of Flood Sediments at Loess Depression Check Dam During 1953-2010

YAN Yan; YUE Da-peng; LI Kui; LIU Peng

doi:10.13961/j.cnki.stbctb.2014.06.067

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Grain Size Cycle Characteristics of Flood Sediments at Loess Depression Check Dam During 1953-2010

- Grain Size Cycle Characteristics of Flood Sediments at Loess Depression Check Dam During 1953-2010
- Bulletin of Soiland Water Conservation Vol. 33, Issue 6, Pages: 349-354(2014)
- 作者机构：
  
  陕西师范大学旅游与环境学院,陕西,西安,710062
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2014.06.067
  CLC：
- Published：2014
- 稿件说明：
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YAN Yan, YUE Da-peng, LI Kui, et al. Grain Size Cycle Characteristics of Flood Sediments at Loess Depression Check Dam During 1953-2010[J]. Bulletin of Soiland Water Conservation, 2014, 33(6): 349-354.
DOI：

YAN Yan, YUE Da-peng, LI Kui, et al. Grain Size Cycle Characteristics of Flood Sediments at Loess Depression Check Dam During 1953-2010[J]. Bulletin of Soiland Water Conservation, 2014, 33(6): 349-354. DOI： 10.13961/j.cnki.stbctb.2014.06.067.

摘要

利用

137

Cs断代技术进行沉积物的测年

结合1953年以来的降雨资料

对黄土洼天然聚湫坝淤地的水成沉积物粒度旋回特征进行了分析。结果表明

坝淤地4 m沉积物是在近百年内形成的

物源比较单一

主要为洪水沉积物;降雨是影响沉积物粒度的主要因素;淤地坝内洪水沉积物粒度以粗粉砂为主

中砂含量很少

没有粗砂;沉积物剖面具有良好的沉积层理

剖面粒度旋回至少记录了42次较大的洪水事件

不同期次洪水沉积物之间粒度变化明显

反映了该区近百年内年流域侵蚀和降水量的变化。

Abstract

Dating the sediments age with 137Cs

using rainfall data since 1953

the grain size cycle characteristics of hydatogen sediments in natural check dam of loess depression are analyzed. Results showed that the 4 m depth of sediments was formed in the recently one hundred years

and its material was mainly coming from flood erosion. Rainfall was the main factor affecting the particle size of sediments. Flood sediments was mainly composed of coarse silt

while the ratio of medium sand was low and the coarse sand was not found. The section of sediments had distinct sedimentary layers

which have recorded at least 42 flood events. The grain sizes of flood sediment layer in different periods changed significantly

which showed the rules of watershed erosion and precipitation variation in the recently one hundred years.

关键词

Keywords

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