[1]韩 珍,陈晓燕*,李彦海,等.近饱和与非饱和土壤细沟水流输沙能力的对比研究[J].山地学报,2020,(6):841-850.[doi:10.16089/j.cnki.1008-2786.000560]
　HAN Zhen,CHEN Xiaoyan*,LI Yanhai,et al.Comparison of Sediment Transport Capacity along Rills of Partially Saturated and Non-Saturated Soils[J].Mountain Research,2020,(6):841-850.[doi:10.16089/j.cnki.1008-2786.000560]
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近饱和与非饱和土壤细沟水流输沙能力的对比研究
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2020年第6期
页码:
841-850
栏目:
山地环境
出版日期:
2020-12-25

文章信息/Info

Title:
Comparison of Sediment Transport Capacity along Rills of Partially Saturated and Non-Saturated Soils
文章编号:
1008-2786-(2020)6-841-10
作者:
韩 珍; 陈晓燕*; 李彦海; 陈仕奇; 顾小杰
西南大学 资源环境学院,重庆 400715
Author(s):
HAN Zhen;  CHEN Xiaoyan*;  LI Yanhai;  CHEN Shiqi;  GU Xiaojie
College of Resources and Environment, Southwest University, Chongqing400716, China
关键词:
泥沙输移;  侵蚀敏感性;  水流功率;  细沟侵蚀;  坡耕地
Keywords:
sediment transport;  erosion sensitivity;  stream power;  rill erosion;  slope cropland
分类号:
S157.1
DOI:
10.16089/j.cnki.1008-2786.000560
文献标志码:
A
摘要:
近饱和与非饱和土壤在水文、力学、结构等方面存在的差异可能会造成泥沙输移行为的不同。研究通过细沟模拟试验测定了近饱和与非饱和土壤在2、4及8 L·min-1三个流量和5°、10°、15°及20°四种坡度工况条件下的侵蚀过程,根据细沟剥蚀率与水流含沙量之间的关系解析得到相应的水流输沙能力,并采用试验验证解析值的合理性。通过方程模型量化近饱和与非饱和土壤水流输沙能力与水流功率之间的关系,在此基础上对比分析了二者水流输沙能力之间的差异。试验结果表明,解析得到的水流输沙能力与相同工况条件下的实测水流输沙能力间的差异为2%～6%。对数方程可以很好地表达近饱和与非饱和土壤水流输沙能力与水流功率之间的关系。各试验条件下近饱和土壤水流输沙能力是非饱和的1.08～2.35倍,表明土壤处于近饱和状态下更易发生侵蚀搬运。研究结果将有助于理解近饱和状态下土壤侵蚀水动力学机理,为完善土壤侵蚀物理模型提供理论依据。
Abstract:
The behaviors of partially saturated and non-saturated soils differ greatly in terms of their hydrology, mechanics, and structures, which may cause many differences during the process of sediment transport, and are therefore worthy of further in-depth study. In this study, a series of experiments was conducted to determine the sediment concentration of partially saturated and non-saturated soils at four slope gradients(5°, 10°, 15°, and 20°)and three flow discharges(2, 4, and 8 L·min-1). According to the model analysis of detachment rate and sediment concentration, the sediment transport capacity under corresponding hydraulic conditions was determined, and then the correctness of the analytical method was further verified by experiments. The equation model was used to quantify the relationship between sediment transport capacity and stream power. Then, the differences in the sediment transport capacity of partially saturated and non-saturated soils were compared and analyzed. The results showed that the difference between the analytical sediment transport capacity and the measured sediment transport capacity was 2%～6%, which indicated the correctness and rationality of the analytical method. The sediment transport capacity of partially saturated and non-saturated soils showed an increasing trend with an increased slope gradient and flow discharge. The logarithmic equation model can more accurately describe the relationship between the sediment transport capacity and the stream power. The sediment transport capacity of partially saturated soil was 1.08～2.35 times that of non-saturated soil, which indicated that the soil in partially saturation was more prone to erosion under the same hydraulic conditions. The research will help to understand the hydrodynamic mechanism of soil erosion under partially saturation and provide theoretical basis for improving the physical model of erosion.

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相似文献/References:

[1]文安邦,张信宝,张一云,等.黄土峁坡耕地土壤侵蚀与泥沙输移[J].山地学报,1995,(02):85.
[2]王协康,方铎,曹叔尤,等.坡面非均匀沙输移机理实验方法[J].山地学报,1999,(03):39.

备注/Memo

备注/Memo:
收稿日期(Received date):2020-04-20; 改回日期(Accepted date):2020-11-17
基金项目(Foundation item):国家自然科学基金(41571265); 重庆市社会民生类重点研发项目(cstc2018jscx-mszdX0061)。[National Natural Science Foundation of China(41571265); Key Research and Development Project of Social Livelihood in Chongqing(cstc2018jscx-mszdX0061)]
作者简介(Biography):韩珍(1994-),女,陕西铜川人,博士研究生,主要研究方向:土壤侵蚀及流域治理。[HAN Zhen(1994-), female, born in Shan xi, M.Sc. Ph. D. candidate,research on soil erosion] E-mail: m13658372800@163.com
*通讯作者(Corresponding author):陈晓燕(1971-),女,博士,研究员,主要研究方向:土壤侵蚀及流域治理。[CHEN Xiaoyan(1971-), female, Ph.D., professor, research on soil erosion]E-mail: c400716@126.com
更新日期/Last Update: 2020-11-30