Dynamic processes of dust emission from gobi: A portable wind tunnel study atop the Mogao Grottoes, Dunhuang, China

IF 3.1 3区地球科学 Q2 GEOGRAPHY, PHYSICAL Aeolian Research Pub Date : 2022-03-01 DOI:10.1016/j.aeolia.2022.100784

Weimin Zhang , Lihai Tan , Linhao Liang , Shuyi Chen , Guobin Zhang , Hongtao Zhan , Fei Qiu , Shaoxiu Ma

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引用次数: 3

Abstract

The dynamic process of dust emission from gobi is a largely un-solved scientific question while it is essential for minimizing the dust hazards. In this study, field wind tunnel experiments have been performed to reveal the processes of dust emission from gobi on the top of the Mogao Grottoes. We found that the dust content of gobi is the dominant factor that determines the intensity of dust emission. The vertical PM10 flux increased exponentially with the increase of dust content on the gobi surface at a given wind speed. The impact energy of saltating particles is another control factor of the dust emission flux. The vertical PM10 flux due to saltation bombardment of the external sand supply was 5–13 times larger than that without the bombardment of sand supply. This study indicates that gobi on the top of the Mogao Grottoes is one of the main dust sources as it has an abundance of sand supply from Mingsha Mountain as well as its richness in dust content. Hence, it is imperative to expand the existing sand control system on the top of the Mogao Grottoes in order to minimize the impact of dust hazards on the Mogao Grottoes.

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戈壁沙尘排放的动态过程:敦煌莫高窟的便携式风洞研究

戈壁沙尘排放的动态过程是一个尚未解决的科学问题，但对减少沙尘危害至关重要。本文通过野外风洞试验，揭示了莫高窟顶部戈壁的粉尘排放过程。研究发现，戈壁的含沙量是决定沙尘排放强度的主要因素。在一定风速下，垂直PM10通量随戈壁表面粉尘含量的增加呈指数增长。弹射粒子的冲击能是影响粉尘发射通量的另一个控制因素。外供砂轰击后的PM10垂直通量是无外供砂轰击时的5 ~ 13倍。研究表明，莫高窟顶部戈壁具有丰富的明沙山沙源和丰富的含沙量，是莫高窟主要的沙源之一。因此，必须扩大莫高窟顶部现有的防沙系统，以尽量减少沙尘灾害对莫高窟的影响。

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来源期刊

Aeolian Research GEOGRAPHY, PHYSICAL-

CiteScore

7.10

自引率

6.10%

发文量

审稿时长

>12 weeks

期刊介绍： The scope of Aeolian Research includes the following topics: • Fundamental Aeolian processes, including sand and dust entrainment, transport and deposition of sediment • Modeling and field studies of Aeolian processes • Instrumentation/measurement in the field and lab • Practical applications including environmental impacts and erosion control • Aeolian landforms, geomorphology and paleoenvironments • Dust-atmosphere/cloud interactions.