BIAN Qian,LI Chuncheng.Analysis of Rainstorm Water Vapor Transport Causing Mountain Torrents Sichuan Liangshan by Combining Eulerian and Lagrange Methods[J].Journal of Chengdu University of Information Technology,2025,40(03):397-402.[doi:10.16836/j.cnki.jcuit.2025.03.022]
欧拉方法与拉格朗日方法相结合的四川凉山一次引发山洪的暴雨水汽输送分析
- Title:
- Analysis of Rainstorm Water Vapor Transport Causing Mountain Torrents Sichuan Liangshan by Combining Eulerian and Lagrange Methods
- 文章编号:
- 2096-1618(2025)03-0397-06
- 分类号:
- P456.4
- 文献标志码:
- A
- 摘要:
- 为分析四川凉山2023年8月21日一次引发山洪灾害的暴雨天气过程的水汽输送特征,利用高空、地面观测资料、NCEP再分析资料和GDAS资料,结合欧拉方法和拉格朗日方法(HYSPLIT模式),研究得出短波槽、切变线、地面冷空气及强烈的不稳定能量是此次暴雨产生的有利条件。暴雨发生前凉山州的水汽主要来源于西太平洋、南海及孟加拉湾。暴雨发生时水汽主要来源于西太平洋、南海、孟加拉湾及北方。结合HYSPLIT模式得出,700 hPa、600 hPa的水汽主要来源于凉山州本地及周边地区,其次是孟加拉湾和周边地区,两者的水汽贡献率之和高达90%以上。500 hPa的水汽主要来源于孟加拉湾和周边地区及青藏高原东侧,两者的水汽贡献率占79%。越往低层凉山本地及周边地区在暴雨过程中的水汽贡献越高。
- Abstract:
- To analyze the characteristics of water vapor transport during a torrential rain process that caused flash floods in the Liangshan 2023 of Sichuan province in August 21,2005, the high altitude and ground observation data, NCEP reanalysis data, and GDAS data were used, combining the Al-ULA method with the HYSPLIT model, it was found that the short-wave trough, the shear line, the surface cold air and the strong unstable energy were the favorable conditions for the Lagrangian. Before the rainstorm, the water vapor mainly came from the western Pacific, South China Sea, and the Bay of Bengal. Water vapor mainly comes from the western Pacific and the South China Sea, Bay of Bengal and the north. Combined with the Hysplit model, the water vapor of 700 hPa and 600 hPa mainly comes from Liangshan prefecture and its surrounding areas, followed by the Bay of Bengal and its surrounding areas. The combined contribution of water vapor of the two regions is more than 90%.500 hPa of water vapor mainly comes from Bay of Bengal and its surrounding areas and the eastern side of the Qinghai-Tibet Plateau, and the contribution rate of water vapor is 79%.The contribution of water vapor to the local and surrounding areas in the process of heavy rainfall is higher.
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备注/Memo
收稿日期:2023-11-08
通信作者:边茜.E-mail:1126492257@qq.com