气象2025，Vol.51Issue(7)：817-829,13.DOI:10.7519/j.issn.1000-0526.2025.011502
秋汛期汉江上游大洪水事件特征及大尺度环流分析
Characteristics and Large-Scale Circulation Analysis of Major Flood Events in the Upper Reaches of Hanjiang River During Autumn Flood Season
摘要
Abstract
To provide a reference for weather forecasting of major floods in the upper reaches of the Han-jiang River during autumn flood season,based on NCEP/NCAR reanalysis data and conventional meteoro-logical and hydrological observation data,we analyze the water regimen and rainfall characteristics,large-scale circulation characteristics,and causes for flood-causing rainstorm of major floods in the upper reaches of the Hanjiang River during autumn flood season since 2000.The results showed that the flood processes in the Hanjiang River Basin have gradually increased during autumn flood season since the 21st century.The flood-causing rainstorm center in autumn flood season is mainly located in the south and west of the upper reaches of the Hanjiang River,that is,the Micang Mountain and Daba Mountain in the south of the Hanjiang River Basin,the river valley in the upstream of the Ankang Reservoir,and the Danjiang River section at the southern foot of the Waifang Mountain and the westsouth slope of the Funiu Mountain.The peak of floods usually presents in the patterns of single peak,double peak or multiple peak.The duration of a single peak flood process is the shortest,while the duration of a multipeak flood process is the lon-gest.The duration from the onset of maximum precipitation to the appearance of the flood peak is 43 h on average.When the initial inflow exceeds 4500 m3·s-1,the time required for the formation of the flood peak will be greatly shortened.From the perspective of large-scale circulation characteristics,the abnormal precipita-tion in the upper reaches of the Hanjiang River in autumn flood season is closely correlated to the strong blocking system in the mid-high latitudes over the Eurasia,the stronger and westward Western Pa-cific subtropical high,the northward South Asia high and subtropical westerly jet flow.The high-level di-vergence large-value area corresponds to the upper reaches of the Hanjiang River.The vertical motion from low to high levels is enhanced,which is conducive to the occurrence of flood-causing rainstorm.The water vapor transported northward from the Arabian Sea through the Indian Peninsula and the southern South China Sea and westward from the Western Pacific in autumn flood season flood year in the upper reaches of the Hanjiang River has increased abnormally,providing an unusually sufficient water vapor supply for the occurrence of flood-causing rainstorm.关键词
汉江秋汛/大洪水/致洪暴雨过程/丹江口水库/雨洪响应/环流异常Key words
autumn flood in Hanjiang River/major flood/flood-causing rainstorm process/Danjiangkou Reservoir/rain flood response/abnormal circulation分类
天文与地球科学引用本文复制引用
王孝慈,孟英杰,周耘逸,王海燕,王继竹,李波,祁海霞..秋汛期汉江上游大洪水事件特征及大尺度环流分析[J].气象,2025,51(7):817-829,13.基金项目
湖北省自然科学基金项目(2023AFD099)、中国气象局水文气象重点开放实验室开放研究课题(24SWQXZ029)、中国气象局创新发展专项(CXFZ2022J018)、中国长江电力股份有限公司科研项目(2421020002)和中国气象局流域强降水重点开放实验室项目(2023BHR-Y10)共同资助 （2023AFD099）
