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地球科学进展  2019, Vol. 34 Issue (8): 787-800    DOI: 10.11867/j.issn.1001-8166.2019.08.0787
综述与评述     
输沙率对土壤颗粒特性和气流湍流脉动的响应
邹学勇1,2(),张梦翠1,张春来1,2,程宏1,2,李慧茹1,张峰1,2
1. 北京师范大学 地理科学学部,北京 100875
2. 北京师范大学 防沙治沙教育部工程研究中心,北京 100875
Response of Aeolian Flux to Soil Particle Properties and Airflow Turbulence Fluctuation
Xueyong Zou1,2(),Mengcui Zhang1,Chunlai Zhang1,2,Hong Cheng1,2,Huiru Li1,Feng Zhang1,2
1. Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
2. MOE Engineering Research Center of Desertification and Blown-Sand Control, Beijing Normal University, Beijing 100875, China
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摘要:

自然界的输沙过程通常因气流湍流脉动而呈现不稳定状态,风和输沙率的各个物理量具有很强的脉动特性,甚至间歇性。经典的稳态输沙率方程没有考虑土壤颗粒特性和气流湍流特征等物理量,已经不能准确预测湍流风驱动的输沙过程。通过对稳态输沙率方程中包含的变量及其对输沙率的影响、土壤颗粒特性和气流湍流脉动对非稳态输沙过程的影响,以及非稳态输沙过程对气流湍流脉动的延时响应等方面的深入分析,对稳态输沙与非稳态输沙进行了界定,提出了非稳态输沙率方程的构建原则和包含的变量,以及建立非稳态输沙率方程的途径。最后,对建立非稳态输沙率方程过程中可预见的关键问题进行了探讨。

关键词: 非稳态输沙输沙率方程土壤颗粒特性湍流脉动    
Abstract:

The process of aeolian flux in wild areas is usually unstable due to turbulent fluctuation of airflow. The physical parameters of wind and aeolian flux have strong pulsation characteristics and are even intermittent. Since the classical aeolian flux equations derived from steady sediment transport processes do not take into account the physical parameters such as soil particle properties and airflow turbulence characteristics, they cannot accurately predict the process of sediment transport driven by turbulent wind. Based on the analysis of the variables contained in the classical aeolian flux equations and their effects on the aeolian flux, the soil particle properties and the airflow turbulent fluctuation which influence unsteady sediment transport process, and the delayed response of the unsteady sediment transport process to airflow turbulent fluctuation, then the steady and unsteady sediment transports were defined. Strictly, there is no steady sediment transport process in nature, but the sediment transport process in a short period of time can be roughly considered to be a steady sediment transport process as the fluctuation of sediment transport is very little. Thus, the unsteady sediment transport process in a long-term series can be regarded as series of steady sediment transport processes on an "appropriate time scale" (Δt). The construction principles, variables in unsteady aeolian flux equation, and establishing unsteady aeolian flux equation of the way which is the method of determining each variable by controlling the conditional experiments were put forward. Finally, the foreseeable key issues in the process of establishing the unsteady aeolian flux equation were discussed.

Key words: Unsteady sediment transport    Aeolian flux equation    Aeolian particle properties    Airflow turbulence fluctuation.
收稿日期: 2019-07-08 出版日期: 2019-10-11
ZTFLH:  P934  
基金资助: 国家自然科学基金面上项目“输沙率对土壤颗粒特性;气流湍流脉动的响应”(41871002);国家自然科学基金重点项目“土壤风蚀速率对影响因子动态变化的响应”(41630747)
作者简介: 邹学勇(1964-),男,安徽六安人,教授,主要从事风沙物理与沙漠化防治研究. E-mail:zouxy@bnu.edu.cn
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引用本文:

邹学勇,张梦翠,张春来,程宏,李慧茹,张峰. 输沙率对土壤颗粒特性和气流湍流脉动的响应[J]. 地球科学进展, 2019, 34(8): 787-800.

Xueyong Zou,Mengcui Zhang,Chunlai Zhang,Hong Cheng,Huiru Li,Feng Zhang. Response of Aeolian Flux to Soil Particle Properties and Airflow Turbulence Fluctuation. Advances in Earth Science, 2019, 34(8): 787-800.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2019.08.0787        http://www.adearth.ac.cn/CN/Y2019/V34/I8/787

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