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| 三峡库区暴雨时空特征及其与洪涝的关系 | |
| 引用本文： | 郭渠,罗伟华,程炳岩,孙卫国,邓爱娟.三峡库区暴雨时空特征及其与洪涝的关系[J].资源科学,2011,33(8):1513-1521. |
| 作者姓名： | 郭渠 罗伟华 程炳岩 孙卫国 邓爱娟 |
| 作者单位： | 1. 重庆市气候中心,重庆,401147 2. 兴宁市气象局,兴宁,514500 3. 南京信息工程大学应用气象学院,南京,210044 4. 武汉区域气候中心,武汉,430074 |
| 基金项目： | 中国气象局2010年气候变化专项：“全球变暖背景下三峡库区极端气候事件趋势预估研究”(编号：CCSF 2010-11) ；南京信息工程大学科研基金课题9922资助。 |
| 摘 要： | 根据三峡库区及其周围35个气象站1961年-2010年的逐日降雨资料,采用常规统计方法分析了50年来三峡库区暴雨日数、暴雨强度的时空动态变化特征。结果表明：过去50年间,三峡库区年均暴雨日数为3.4天,存在2.3年和5年尺度的周期振荡;暴雨强度为72.9mm,具有9.6年尺度的变化周期。7月的暴雨日数最多且强度最强。在20世纪80年代暴雨日数与强度为正距平,在21世纪最初10年,暴雨日数显著减少,暴雨强度增加。三峡库区暴雨日数呈盆地和谷地少、山区多的空间分布,东南部是暴雨日数与持续性暴雨的多发带;暴雨强度东南部较高,西南部低。三峡库区夏季暴雨与洪涝的关系非常密切,特别是20世纪80年代暴雨对洪涝的贡献最为明显 |
| 关 键 词： | 三峡库区 暴雨 年代际变化 |
| 修稿时间： | 6/7/2011 12:00:00 AM |
Spatial-Temporal Characteristics of Rainstorm and Its Relationship with Flood in the Three Gorges Reservoir |
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| GUO Qu,LUO Weihu,CHENG Bingyan,SUN Weiguo and Deng Aijuan.Spatial-Temporal Characteristics of Rainstorm and Its Relationship with Flood in the Three Gorges Reservoir[J].Resources Science,2011,33(8):1513-1521. | |
| Authors: | GUO Qu LUO Weihu CHENG Bingyan SUN Weiguo and Deng Aijuan |
| Institution: | Chongqing Climate Center, Chongqing 401147, China;Xingning Meteorological Bureau, Guangdong Province 514500, China;Chongqing Climate Center, Chongqing 401147, China;Department of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China;Wuhan Regional Climate Center, Wuhan 430074, China |
| Abstract: | The three gorges area was located in the connection of the Sichuan Basin and the Middle-Lower Yangtze plains. It crossed the canyon of central Hubei and ridge-valley of eastern Sichuan, facing the south of the Daba Mountain and the north of the Sichuan-Hubei plateau. Under the influences of East Asian summer monsoon and its special topography, it often has heavy rainstorm and flood which has an important influence on waterways safety and flood control. Many domestic researchers have made extensive studies, such as water resources, ecological environment, and extreme events of weather and climate in the three gorges area. Some researchers performed weather analysis of heavy rainstorm in the three gorges area, but they mainly focused on case studies of heavy rainstorm, drought-flood characteristics in summer, and circulation background of precipitation anomaly. Studies on long-term variability of heavy rainstorm in the three gorges area do not seem adequate. Based on daily precipitation data at 35 stations in or around the Three Gorges Reservoir during the period 1961-2010, the dynamic temporal and spatial variation characteristics of rainstorm days and its intensity were analyzed by mathematical statistical methods. Results show that the mean annual rainstorm days were 3.4 days, oscillating with a cycle of about 2.3 or 5 years, and the rainstorm intensity was 72.9 mm, oscillating with a cycle of about 9.6 years in the past 50 years. The frequency and intensity of rainstorm in July were the most in the year. Both the mean annual rainstorm days and intensity were positive anomaly in the 1980s, and in the first 10 years of the 21st century, rainstorm days obviously decreased, but the intensity increased. The distribution of rainstorm days of the mountainous region seemed to be more than that of the valleys and basins region. The southeastern Three Gorges Reservoir had the most rainstorm days and the continuous rainstorm here was most frequent. Results also show that there was a close relationship between heavy rain and flooding disasters in the monsoon region, especially in the Three Gorges Reservoir in the 1980s. It should also be noted that with storing water of the Three Gorges, the increasing water level and surface of it might have some influence on local climate. Now, although some exploratory studies have been done, most of them appear to be fall short of revealing the influence of the Three Gorges on local climate well due to the lack of observation data. This needs long-term observation and study. |
| Keywords: | Three Gorges Reservoir Rainstorm Interdecadal variation |
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