Analysis on the causes of a continuous clear-sky gale event in winter in the Three Gorges Dam Area
A continuous clear-sky gale event (hereinafter referred to as "21·1" clear-sky gale in the dam area) occurs in the Three Gorges Dam Area in the middle January of 2021, which seriously affected the navigation safety of the Yangtze River near the dam area. Using routine upper-air and surface...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Torrential Rain and Disasters
2022-04-01
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| Series: | 暴雨灾害 |
| Subjects: | |
| Online Access: | http://www.byzh.org.cn/cn/article/doi/10.3969/j.issn.1004-9045.2022.02.009 |
| _version_ | 1797786999249174528 |
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| author | Yuanyue FAN Jiaguo ZHANG Xuebin MEI Hongbing LI Lili DING |
| author_facet | Yuanyue FAN Jiaguo ZHANG Xuebin MEI Hongbing LI Lili DING |
| author_sort | Yuanyue FAN |
| collection | DOAJ |
| description | A continuous clear-sky gale event (hereinafter referred to as "21·1" clear-sky gale in the dam area) occurs in the Three Gorges Dam Area in the middle January of 2021, which seriously affected the navigation safety of the Yangtze River near the dam area. Using routine upper-air and surface observations, mesoscale observational data and other data, we have applied the weather analysis and dynamic diagnostic methods to analyze the spatial-temporal distribution characteristics and the causes of "21·1" clear-sky gale in the dam area. The results show that this clear-sky gale event occurred in the valley under the leeward slope, and there are four wind speed fluctuations during the whole event, whose wind speed at night is greater than that in the daytime. The ground gale is caused by the momentum downward-transportation in the boundary layer, which is derived from the low-level jet. The aforementioned descending motion causing the ground gale is related to the lee wave with large amplitude. During this clear-sky gale event, the steady vertical wind shear and inversion layer in the boundary layer make the lee wave last for a long time, and the greater vertical declining rate of temperature under the inversion layer further strengthens the descending motion, which is the main reason why the "21·1" clear-sky gale in the dam area forms and continues. |
| first_indexed | 2024-03-13T01:16:44Z |
| format | Article |
| id | doaj.art-9c317c92db1d42e28f067e725cc2cd26 |
| institution | Directory Open Access Journal |
| issn | 2097-2164 |
| language | zho |
| last_indexed | 2024-03-13T01:16:44Z |
| publishDate | 2022-04-01 |
| publisher | Editorial Office of Torrential Rain and Disasters |
| record_format | Article |
| series | 暴雨灾害 |
| spelling | doaj.art-9c317c92db1d42e28f067e725cc2cd262023-07-05T10:09:55ZzhoEditorial Office of Torrential Rain and Disasters暴雨灾害2097-21642022-04-0141218419110.3969/j.issn.1004-9045.2022.02.0092816Analysis on the causes of a continuous clear-sky gale event in winter in the Three Gorges Dam AreaYuanyue FAN0Jiaguo ZHANG1Xuebin MEI2Hongbing LI3Lili DING4Yichang Meteorological Office of Hubei Province, Yichang 443000Wuhan Central Meteorological Observatory, Wuhan 430074Yichang Meteorological Office of Hubei Province, Yichang 443000Yichang Meteorological Office of Hubei Province, Yichang 443000Yichang Meteorological Office of Hubei Province, Yichang 443000A continuous clear-sky gale event (hereinafter referred to as "21·1" clear-sky gale in the dam area) occurs in the Three Gorges Dam Area in the middle January of 2021, which seriously affected the navigation safety of the Yangtze River near the dam area. Using routine upper-air and surface observations, mesoscale observational data and other data, we have applied the weather analysis and dynamic diagnostic methods to analyze the spatial-temporal distribution characteristics and the causes of "21·1" clear-sky gale in the dam area. The results show that this clear-sky gale event occurred in the valley under the leeward slope, and there are four wind speed fluctuations during the whole event, whose wind speed at night is greater than that in the daytime. The ground gale is caused by the momentum downward-transportation in the boundary layer, which is derived from the low-level jet. The aforementioned descending motion causing the ground gale is related to the lee wave with large amplitude. During this clear-sky gale event, the steady vertical wind shear and inversion layer in the boundary layer make the lee wave last for a long time, and the greater vertical declining rate of temperature under the inversion layer further strengthens the descending motion, which is the main reason why the "21·1" clear-sky gale in the dam area forms and continues.http://www.byzh.org.cn/cn/article/doi/10.3969/j.issn.1004-9045.2022.02.009clear-sky galemomentum downward-transportationleeward waveinversion layerthree gorges dam area |
| spellingShingle | Yuanyue FAN Jiaguo ZHANG Xuebin MEI Hongbing LI Lili DING Analysis on the causes of a continuous clear-sky gale event in winter in the Three Gorges Dam Area 暴雨灾害 clear-sky gale momentum downward-transportation leeward wave inversion layer three gorges dam area |
| title | Analysis on the causes of a continuous clear-sky gale event in winter in the Three Gorges Dam Area |
| title_full | Analysis on the causes of a continuous clear-sky gale event in winter in the Three Gorges Dam Area |
| title_fullStr | Analysis on the causes of a continuous clear-sky gale event in winter in the Three Gorges Dam Area |
| title_full_unstemmed | Analysis on the causes of a continuous clear-sky gale event in winter in the Three Gorges Dam Area |
| title_short | Analysis on the causes of a continuous clear-sky gale event in winter in the Three Gorges Dam Area |
| title_sort | analysis on the causes of a continuous clear sky gale event in winter in the three gorges dam area |
| topic | clear-sky gale momentum downward-transportation leeward wave inversion layer three gorges dam area |
| url | http://www.byzh.org.cn/cn/article/doi/10.3969/j.issn.1004-9045.2022.02.009 |
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