| 摘要: |
| 对比分析1968年8月(简称"68.8")和2001年7月(简称"01.7")郁江南宁大洪水的气象学特征,认为"68.8"和"01.7"大洪水的主要影响天气系统背景,前者是西南涡影响在前,台风影响在后的暴雨天气,后者是单一的台风影响下的全流域暴雨-大暴雨强降雨过程。两次大洪水在流域降雨强度的分布上差异较大,前者强降雨中心位于德保、靖西、那坡一带的右江地区,后者位于左江流域的上思县境内;"01.7"大洪水所发生的大暴雨、暴雨的县(市)次分别是"68.8"大洪水的2.33倍和1.33倍,而属于一般性降雨的大雨出现的县(市)次,"68.8"大洪水是"01.7"大洪水的2.29倍;"68.8"大洪水过程时间长、洪水涨势较慢,"01.7"大洪水过程时间短、洪水涨势快。提示降雨天气过程的特别配置或者一次降雨过程引发全流域强降雨都可能造成郁江南宁大洪水。 |
| 关键词: 大洪水 气象学特征 对比分析 |
| DOI： |
| 投稿时间：2001-12-18 |
| 基金项目: |
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| Meteorological Characteristics of Floods “68.8” and “01.7” in Yujiang River around Nanning City |
|
Wu Xingguo
|
| (Guangxi Meteorological Observatory, Nanning, 530022) |
| Abstract: |
| The heavy floods "68.8" took place in Aug.1968 and "01.7" in July 2001 have different weather system background.The former's is the rainfall process with south-west vortex afore and typhoon in succession, and the latter's is the whole river basin rainfall process affected by typhoon only. The intensity rain centre of the "68.8" locates in the Youjiang river basin including Debao, Jingxi and Napo, and the "01.7"'s locates in Shangsi county of Zuojiang river basin. The times of torrential rain and rainstorm on county (city) during Flood "01.7" is 2.33 times and 1.33 times of that of Flood "68.8"respectively, but the times of heavy rain on county (city) during Flood "68.8"is 2.29 times of that of Flood "01.7".In Flood "68.8", the flood lasts longer,and rises slowly,and in Flood "01.7",reverses.It is suggested that the configuration of the rain weather system and the whole river basin rainfall could cause heavy flood in Yujiang River around Nanning city. |
| Key words: heavy flood meteorological characteristics contrast analysis |
