Influence of Jiangjia Gully Debris Flow on Suspended Load Transport of Xiaojiang River in Dongchuan,Yunnan Province

LIN Wei; ZHANG Jin-shan; XIE Hong

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Influence of Jiangjia Gully Debris Flow on Suspended Load Transport of Xiaojiang River in Dongchuan,Yunnan Province

- Influence of Jiangjia Gully Debris Flow on Suspended Load Transport of Xiaojiang River in Dongchuan,Yunnan Province
- Bulletin of Soiland Water Conservation Vol. 30, Issue 6, Pages: 15-20(2011)
- 作者机构：
  
  1. 中国科学院山地灾害与地表过程重点实验室,四川,成都,610041
  2. 中国科学院水利部成都山地灾害与环境研究所,四川,成都,610041
  3. 中国科学院研究生院,北京,100049
- 作者简介：
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- Published：2011
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LIN Wei, ZHANG Jin-shan, XIE Hong. Influence of Jiangjia Gully Debris Flow on Suspended Load Transport of Xiaojiang River in Dongchuan,Yunnan Province[J]. Bulletin of Soiland Water Conservation, 2011, 30(6): 15-20.
DOI：

LIN Wei, ZHANG Jin-shan, XIE Hong. Influence of Jiangjia Gully Debris Flow on Suspended Load Transport of Xiaojiang River in Dongchuan,Yunnan Province[J]. Bulletin of Soiland Water Conservation, 2011, 30(6): 15-20. DOI：

摘要

以2009年8月4日云南省东川蒋家沟暴发的一场泥石流汇入小江的过程为例

观测分析了泥石流汇入后小江泥沙悬移质输移特征变化。通过与2009年雨季测量的小江相关观测数据比较

发现泥石流汇入前、后

小江的悬移质含沙量由4.00kg/m

增大到25.78kg/m

。采用粒度特征分析的图解法分析了蒋家沟泥石流浆体、小江桥处小江悬移质泥沙和新田坝处小江悬移质泥沙的粒度特征参数

及泥石流汇入小江后的变化和粒度特征参数之间的关系。发现结果表明

新田坝处的小江悬移质泥沙大部分来自于泥石流

造成了粒度平均值变小(最大值由7.460μm减小到7.097μm)

但分选性有所提高

属于中等分选性。借助这些关系可以明显区分出挟沙水流和泥石流的浆体。

Abstract

Sedimentary transport of Xiaojiang River was analyzed by a case study of debris flow in Jiangjia gully on August 4

2009.The entrance of debris flow into the river greatly changed the characteristics of suspended sediment transport

in comparison with the observation data during the rainy season.The sediment concentration increased from 4.00 kg/m3 to 25.78 kg/m3 after the confluence of debris flow

yet the grain composition remained almost the same.Furthermore

granular analysis was conducted on the slurry of debris flow and the suspended sediment at the Xiaojiang bridge and Xintian dam

the results showed that the suspended sediment at Xintian Dam mostly came from the debris flow

resulting in the smaller average grain-size parameters(the maximum value decreased from 7.460 μm to 7.097 μm)

but the sorting of them had been enhanced and fell into the medium-sorting.Simultaneously

we noticed that there was still a clear distinction between the sediment slurry of water and debris flow.

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