Experimental Study of Particle Transport and Deposition Distribution over Complex Terrains Based on Spherical Alumina
The transport and deposition of atmospheric particulate matter have attracted significant attention recently due to the increasing frequency of extreme disaster events, such as dust storms, volcanic eruptions, and extensive forest fires. The size distribution of the transported material and the cond...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-11-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/14/12/1756 |
| _version_ | 1797382123378704384 |
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| author | Yusheng Liu Jie Zhang Hongchao Dun Kang Gong Li Shi Ning Huang |
| author_facet | Yusheng Liu Jie Zhang Hongchao Dun Kang Gong Li Shi Ning Huang |
| author_sort | Yusheng Liu |
| collection | DOAJ |
| description | The transport and deposition of atmospheric particulate matter have attracted significant attention recently due to the increasing frequency of extreme disaster events, such as dust storms, volcanic eruptions, and extensive forest fires. The size distribution of the transported material and the conditions of the land–air interface are dominant factors in comprehending the detrimental potential of atmospheric particulate matter. However, it is still a challenge to understand the mechanism of dust deposition, especially over complex terrain. In an effort to investigate the deposition characteristics of particles over complex terrain, a series of experiments were conducted in a multifunctional environmental wind tunnel. The results show that the wind speed directly above the top of the mild slope model is significantly greater than that in the steep slope model, which indicates that a steep slope has a greater blocking effect on wind fields. At low wind speeds, the average wind speed at the top of the mild slope model is 17.8% higher than that at the top of the steep slope model, and at high wind speeds the average wind speed at the top of the mild slope model is 8.6% higher than that at the top of the steep slope model. The influence trend of the steep slope model and the combination model is basically the same, with both decreasing first and then increasing with the direction of wind velocity. The amount of surface deposition is greatly affected by the location of the feeding point and the microscale characteristics of the surface. In the steep slope model, the deposition is mainly distributed on the windward side, while the leeward side has a small amount of deposition. In the mild slope model, particles are deposited not only on the windward side, but also on the leeward side. The average rate of decline in deposition flux in the steep slope model is 88.4% and 75.1% in the mild slope model. The use of the combination model reduces the particle concentration at the back end compared with the single model. In three different models, the deposition on the windward side was shown to be significantly greater than that on the leeward side of the model. Our work increases understanding of the deposition of coarse dust particles over complex terrain and provides basic data for improving the accuracy of large-region particle transport and deposition simulations. |
| first_indexed | 2024-03-08T21:00:58Z |
| format | Article |
| id | doaj.art-c0313313c6274767a67b5bfeb10e4d64 |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-08T21:00:58Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-c0313313c6274767a67b5bfeb10e4d642023-12-22T13:52:46ZengMDPI AGAtmosphere2073-44332023-11-011412175610.3390/atmos14121756Experimental Study of Particle Transport and Deposition Distribution over Complex Terrains Based on Spherical AluminaYusheng Liu0Jie Zhang1Hongchao Dun2Kang Gong3Li Shi4Ning Huang5Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, ChinaKey Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, ChinaKey Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, ChinaKey Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, ChinaKey Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, ChinaKey Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, ChinaThe transport and deposition of atmospheric particulate matter have attracted significant attention recently due to the increasing frequency of extreme disaster events, such as dust storms, volcanic eruptions, and extensive forest fires. The size distribution of the transported material and the conditions of the land–air interface are dominant factors in comprehending the detrimental potential of atmospheric particulate matter. However, it is still a challenge to understand the mechanism of dust deposition, especially over complex terrain. In an effort to investigate the deposition characteristics of particles over complex terrain, a series of experiments were conducted in a multifunctional environmental wind tunnel. The results show that the wind speed directly above the top of the mild slope model is significantly greater than that in the steep slope model, which indicates that a steep slope has a greater blocking effect on wind fields. At low wind speeds, the average wind speed at the top of the mild slope model is 17.8% higher than that at the top of the steep slope model, and at high wind speeds the average wind speed at the top of the mild slope model is 8.6% higher than that at the top of the steep slope model. The influence trend of the steep slope model and the combination model is basically the same, with both decreasing first and then increasing with the direction of wind velocity. The amount of surface deposition is greatly affected by the location of the feeding point and the microscale characteristics of the surface. In the steep slope model, the deposition is mainly distributed on the windward side, while the leeward side has a small amount of deposition. In the mild slope model, particles are deposited not only on the windward side, but also on the leeward side. The average rate of decline in deposition flux in the steep slope model is 88.4% and 75.1% in the mild slope model. The use of the combination model reduces the particle concentration at the back end compared with the single model. In three different models, the deposition on the windward side was shown to be significantly greater than that on the leeward side of the model. Our work increases understanding of the deposition of coarse dust particles over complex terrain and provides basic data for improving the accuracy of large-region particle transport and deposition simulations.https://www.mdpi.com/2073-4433/14/12/1756spherical alumina particlesdeposition of particulate mattermountain modelwind speed profiledeposition flux |
| spellingShingle | Yusheng Liu Jie Zhang Hongchao Dun Kang Gong Li Shi Ning Huang Experimental Study of Particle Transport and Deposition Distribution over Complex Terrains Based on Spherical Alumina Atmosphere spherical alumina particles deposition of particulate matter mountain model wind speed profile deposition flux |
| title | Experimental Study of Particle Transport and Deposition Distribution over Complex Terrains Based on Spherical Alumina |
| title_full | Experimental Study of Particle Transport and Deposition Distribution over Complex Terrains Based on Spherical Alumina |
| title_fullStr | Experimental Study of Particle Transport and Deposition Distribution over Complex Terrains Based on Spherical Alumina |
| title_full_unstemmed | Experimental Study of Particle Transport and Deposition Distribution over Complex Terrains Based on Spherical Alumina |
| title_short | Experimental Study of Particle Transport and Deposition Distribution over Complex Terrains Based on Spherical Alumina |
| title_sort | experimental study of particle transport and deposition distribution over complex terrains based on spherical alumina |
| topic | spherical alumina particles deposition of particulate matter mountain model wind speed profile deposition flux |
| url | https://www.mdpi.com/2073-4433/14/12/1756 |
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