崩岗泥砂流粒度特性及流体类型分析——以广东五华县莲塘岗崩岗为例

doi:10.11867/j.issn.1001-8166.2014.07.0810

地球科学进展

2014, Vol. 29

Issue (7): 810-818 DOI: 10.11867/j.issn.1001-8166.2014.07.0810

研究论文

崩岗泥砂流粒度特性及流体类型分析——以广东五华县莲塘岗崩岗为例

张大林, 刘希林

中山大学地理科学与规划学院,广东广州 510275

Analysis of the Grain Size Properties and Flow Body Classes of the Mud Sand Flow: An Example of Liantanggang Collapsing Hill and Gully in Wuhua County of Guangdong

Zhang Dalin, Liu Xilin

School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, China

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摘要：

崩岗泥砂流是降雨过程中在崩岗流域内形成的一种固液两相流,是崩岗侵蚀泥沙向外输移的主要方式,泥砂流流体类型的判别也是崩岗治理的依据之一。通过野外考察与现场采样,对崩岗泥砂流的粒度组成特性进行了分析。结果表明,泥砂流容重介于1.16~1.60 t/m³之间,含沙量为257.03~960.55 kg/m³,且均自沟道上部至下部逐渐降低。泥砂流浆体以粉砂和黏粒物质为主。随着容重的增加,粒度曲线由单峰型转变为与风化壳土体类似的双峰型,呈现无分选搬运的特点,且流体粒度逐渐粗化。泥砂流固体物质中值粒径与流体容重有较好的线性正相关关系。通过对泥砂流与泥石流和黄土丘陵沟壑区高含沙水流粒度特性的对比后发现,泥砂流属于高含沙水流向泥石流过渡的中间类型,但与泥石流具有更为密切的关系,可以认为泥砂流是广义泥石流的一个亚类,即崩岗型泥石流。

关键词： 崩岗侵蚀; 高含沙水流; 粒度组成; 泥石流; 泥砂流

Abstract:

Mud sand flow is a kind of solid-liquid two-phase flow formed in collapsing hill and gully basin during rainfall. It is the main way to export erosion product. The discrimination of its fluid type is one of the collapsing hill and gully control theoretical basis. This paper analyzed the basic characteristics of mud sand flow like grain size and so on through fieldwork and sampling. The results show that the density of mud sand flow is between 1.16~1.60 t/m³ and the solids content is between 257.03~960.55 kg/m³, both of which decrease from the upper to the lower channel. The slurry of mud sand flow is composed mainly of silt and clay. As the density increases, the particle size distribution curve transforms from a single peak to the bimodal distribution similar to the weathering crust with no sorting, and the grain size of mud sand flow becomes coarser which shows a well positive linear correlation between the sediment median particle diameter and density of mud sand flow. The comparison during mud sand flow, hyperconcentrated flow and debris flow shows that collapsing hill and gully mud sand flow, which belongs to an intermediate class between hyperconcentrated flow and debris flow, has a closer link with debris flow. Therefore, mud sand flow can be considered as a sub-class of generalized debris flow that may be called as collapsing hill and gully type debris flow.

Key words: Collapsing hill and gully erosion Grain size Hyperconcentrated flow Debris flow. Mud sand flow

出版日期: 2014-07-10

P934

基金资助:

国家自然科学基金项目“华南崩岗溯源侵蚀与泥石流启动和形成的试验研究”（编号：41071186）资助

通讯作者: 刘希林（1963-）,男,湖南新邵人,教授,主要从事地貌灾害过程及评估和预测研究. E-mail: liuxilin@mail.sysu.edu.cn

作者简介: 张大林（1987-）,男,山东济南人,博士研究生,主要从事地质灾害评估和预测预报研究.E-mail:zdl87@aliyun.com

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引用本文:

张大林, 刘希林. 崩岗泥砂流粒度特性及流体类型分析——以广东五华县莲塘岗崩岗为例[J]. 地球科学进展, 2014, 29(7): 810-818.

Zhang Dalin, Liu Xilin. Analysis of the Grain Size Properties and Flow Body Classes of the Mud Sand Flow: An Example of Liantanggang Collapsing Hill and Gully in Wuhua County of Guangdong. Advances in Earth Science, 2014, 29(7): 810-818.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2014.07.0810 或 http://www.adearth.ac.cn/CN/Y2014/V29/I7/810

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