[1]张金山,屈益,林伟,等.蒋家沟泥石流入汇时小江悬移质输沙特征分析[J].水土保持研究,2011,18(06):37-41.
　ZHANG Jin-shan,QU Yi,LIN Wei,et al.Suspended Load Characteristics of Xiaojiang River in the Scenario of Debris-Flow Afflux from Ravine[J].Research of Soil and Water Conservation,2011,18(06):37-41.
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蒋家沟泥石流入汇时小江悬移质输沙特征分析

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 18 期数: 2011年06期 页码: 37-41 栏目: 出版日期: 2011-12-20
Title:
Suspended Load Characteristics of Xiaojiang River in the Scenario of Debris-Flow Afflux from Ravine
作者:
张金山1,2, 屈益3, 林伟1,2, 张应良4
1. 中国科学院, 山地灾害与地表过程重点实验室, 成都 610041;
2. 中国科学院, 水利部, 成都山地灾害与环境, 研究所, 成都 610041;
3. 陕西省地矿局第六地质队, 西安 710611;
4. 昆明理工大学, 建筑工程学院, 昆明 650093
Author(s):
ZHANG Jin-shan1,2, QU Yi3, LIN Wei1,2, ZHANG Yin-liang4
1. Key Laboratory of Mountain Hazard and Surface Processes, Chinese Academy of Sciences, Chengdu 610041, China;
2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences & Ministry of Water Conservancy, Chengdu 610041, China;
3. The No.6 Geological Team of the Shaanxi Bureau of Geology and Mineral Resources, Xi’an 710611, China
关键词:
蒋家沟; 泥石流; 小江; 悬移质输沙
Keywords:
the Jiangjia Ravine; debris-flow; Xiaojiang River; suspended load
分类号:
P642.23
摘要:
以2009年8月4日蒋家沟的一场泥石流入汇小江后泥沙观测资料为基础，分析了蒋家沟泥石流入汇小江后的泥沙输移特征。泥石流为小江直接提供了大量的悬移质泥沙，导致入汇时小江输移的泥沙量剧增，输沙率达到了平时的5倍以上；部分堆积于入汇口的泥石流固体物质也在泥石流结束后受小江水流冲刷再次起动，使小江悬移质输沙率在泥石流结束后呈平稳下降，与蒋家沟呈幂曲线下降形成明显的区别。由于泥石流输入的泥沙中细颗粒更容易被小江水流输移，因此尽管入汇的泥石流泥沙中粗颗粒含量较高，但在小江泥沙中含量增加的却是较细的粉沙、黏土颗粒，小江悬移质的中值粒径与含沙量、输沙率和流量的关系曲线都呈上凸形。
Abstract:
The characteristics of sediment flows in the Xiaojiang River was studied when debris flowed into this river, and the solids transport is systematically investigated. A debris flow occurred on Aug. 14, 2009, in the Jiangjia Ravine was observed and the process of the afflux to the Xiaojiang River was also monitored. With the observation data, the flow of the suspended load in the Xiaojiang River was analyzed after the afflux of debris-flow. Debris flows usually provide a large number of suspended loads for the Xiaojiang River directly, which generally leads to the rapid increment of sediment transport in the river. The sediment transport rate of the suspended loads reached about five times of the normal level. Some of the debris flows deposit at the mouth of the Jiangjia Ravine and enter the Xiaojiang River by erosion. Thus, the suspended load transport rate is observed to decrease steadily rather than the decline like the exponential curve in Jiangjia Ravine. Moreover, fine sediment of the debris-flow is more likely to be transported in the Xiaojiang River. Therefore, the amounts of silts and clays increas with the sediment transport rate faster than that of fine sands. As the result, the relationship curves between the mean particle size, the sediment concentration, the discharge, and the sediment transport rate are found to be convex.

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备注/Memo

收稿日期:2011-7-3;改回日期:2011-8-4。
基金项目:国家自然科学基金“泥石流入汇主河后泥沙输移规律研究”(40871024)
作者简介:张金山(1972- )，男，甘肃古浪人，博士，研究方向为泥石流等山地灾害减灾理论与实践。E-mail：zjszj@163.com

更新日期/Last Update: 1900-01-01