###
DOI:
本文二维码信息
2018年长江上游严重洪涝的气象水文特征
高琦
(武汉中心气象台)
Meteorological and hydrological characteristics of severe floods over the upper Changjing River Basin in 2018
gaoqi
(Wuhan Central Meteorological Observatory)
摘要
相似文献
本文已被:浏览 260次   下载 77
投稿时间:2018-11-06    修订日期:2019-03-20
中文摘要: 利用NCEP/NCAR再分析资料及常规气象水文实况观测资料,分析了2018年6-7月长江上游严重洪涝期间的气象水文特征,结果表明:2018年长江上游洪涝期间发生了3次强降水过程,降水落区在长江上游北部地区高度重叠,引发了严重的洪涝灾害。大尺度的环流形势分析表明,中高纬低槽、副高、鄂海阻高、乌山阻高均较历史同期异常偏强,副高的南北摆幅较大,当副高每次北跳后,都会与槽后冷空气在长江上游遭遇,形成一次强降水过程。大尺度环流的“鞍”型场配置有利于孟加拉湾及南海的水汽输送到长江上游地区,并在该地区与中纬度西风带水汽辐合形成强降水。历史对比结果表明:2018年长江上游的降水具有面上强度大、北部支流降水极端性强、降水时间集中的特点。2018年长江上游北部的沱江、涪江、嘉陵江等流域在水位和超警戒时间上均高于2012年。2018年长江上游总的降水量及洪峰流量虽未超过2012年,但在长江上游北部的沱江、涪江、嘉陵江引发的洪涝灾害可超过2012年。
Abstract:Based on NCEP/NCAR reanalysis data and conventional meteorological and hydrological observation data, the meteorological and hydrological characteristics of the upper Changjing River Basin during the severe flooding period from June to July 2018 are analyzed. The results show that three heavy precipitation processes occurred during the flooding period of the upper Changjing River Basin in 2018, and the precipitation falling areas overlap highly in the northern part of the upper Changjing River Basin, causing serious disaster. Large-scale circulation analysis shows that the low trough, subtropical high, Okhotsk resistance high and Ural resistance high in middle and high latitudes are stronger than those in the same period in history. The north-south swing of subtropical high is larger. When the subtropical high jumps northward, it will encounter with the cold air behind the trough in the upper Changjing River Basin, forming a heavy precipitation process. The "saddle" configuration of large-scale circulation facilitates the water vapor transport from the Bay of Bengal and the South China Sea to the upper Changjing River Basin, and the convergence of water vapor in the region and the mid-latitude westerly zone forms heavy precipitation. The historical results show that the precipitation in the upper Changjing River Basin in 2018 is characterized by strong surface intensity, strong extreme precipitation in the northern tributaries and more concentrated rain period. Compared with 2012, the northern tributary of the upper Changjing River Basin have high water level and long time of exceeding the warning water level. The flood situation of Tuojiang, Fujiang and Jialing rivers is stronger than that of 2012. In 2018, the total precipitation and peak flow of the upper Changjing River Basin did not exceed 2012, but the flood disasters caused by the Tuojiiang, Fujiang and Jialing rivers in the north of the upper Changjing River Basin could exceed 2012.
文章编号:201811060484     中图分类号:    文献标志码:
基金项目:国家重点研发计划项目(2018YFC1507200,2018YFC1507000);湖北省自然科学基金(2018CFB706);国家自然科学基金项目(91637105,41475041);国家重点研发计划重点专项项目(2018YFC150780);湖北省气象局科技发展基金(2018Y02);武汉暴雨研究所科研业务经费(IHRKYYW201807,IHRKYYW201909)
引用文本:
高琦,2019.[en_title][J].Meteor Mon,():-.
gaoqi,2019.Meteorological and hydrological characteristics of severe floods over the upper Changjing River Basin in 2018[J].Meteor Mon,():-.