地理学报 ›› 2000, Vol. 67 ›› Issue (S1): 20-25.doi: 10.11821/xb2000S1004

• 论文 • 上一篇    下一篇

三峡库区秋雨的气候演变规律

孙冷, 黄朝迎   

  1. 国家气候中心,北京100081
  • 收稿日期:2000-05-31 修回日期:2000-09-20 出版日期:2000-12-15 发布日期:2000-12-15
  • 基金资助:
    国家“九五”重中之重项目(96-908-03-03-1)

The Evolutionary Law of Autumn Rain in the Three Gorges Reservoir Area

SUN Leng, HUANG Chao-ying   

  1. National Climate Center, Beijing 100081
  • Received:2000-05-31 Revised:2000-09-20 Online:2000-12-15 Published:2000-12-15
  • Supported by:
    The National Key Project of the Ninth Five Year Plan, No.96-908-03-03-1

摘要: 利用三峡库区28个站1960~1996年10月~11月的逐日降水资料,分析秋雨发生的气候概况、降雨日数分布,降雨量分布、秋雨过程及其频率分布,研究秋雨的年际变化规律,其结果可为长江三峡工程提供参考,有助于做好三峡工程的气象保障工作。

关键词: 三峡库区, 秋雨, 演变规律

Abstract: Based on the data of daily precipitation from October to November from 1960 to 1996 at 28 stations including Yichang, Wufeng, Lvchongpo, Enshi, Fengjie, Wanxian, Liangping, Fuling, Chongqing, Daxian, Liangzhong, Mianyang, Chengdu, Doujiangyan, Yaan, Emeishan, Leshan, Leibo, Yibin, Nanchong, Shuining, Neijiang, Luzhou, Xuyong, Jinfoshan, Tongzi, Zunyi, Sinan in the Three Gorges reservoir area, the status of autumn rain was analyzed and the evolutionary law was studied. The results showed that autumn rain mainly concentrated from early October to early November during the river closure period in the Three Gorges dam area. The main conclusion were as follows: (1) Mean rain days during October --November are 25 ~ 30days. Particularly, rain days are 30-38 days in western and southwestern plateau of Sicuan Province. And the most area with 45 rain days is Emei Mount. Though the rain days are abundant, the total Precipitation amount is small which is less than that in summer and the intensity is weak. The largest rainfall area with precipitation of 242 mm locates in Lvchongpo. (2) Rain frequency during October~November is decreasing. And there is one thing to be mentioned that the frequency of serious autumn rain is as lower as 10% in dam area of the three Gorges. (3) From the viewpoint of the distribution of autumn rain frequency, it is smaller in western reservoir area of the three Gorges than in eastern part, and it is much frequent in southern part than in northern part. The lowest area is center northern part and the most frequent area is center western part. (4) There is 21 years with serious and normal autumn rain with the frequency of 56. 8% during 1960--1996. Yearly, autumn rain is evident every year in 1960s and every2 year in 1970s. And it is not evident in 1980s. While in 1990s it alternates between the evident year and not evident year. (5) In addition, the features of autumn rain in 1994 and in 1996 are analyzed in this paper due to the evident autumn rain occurrence.

Key words: Three Gorges Reservoir area, autumn rain, evolutionary law

中图分类号: 

  • P467