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| 淠河流域汛期降水集中度和集中期的变化特征 | |
| 引用本文： | 李远平,杨太保,马建国.淠河流域汛期降水集中度和集中期的变化特征[J].资源科学,2012,34(3):418-423. |
| 作者姓名： | 李远平 杨太保 马建国 |
| 作者单位： | 1. 皖西学院资源环境与旅游管理系,六安,237012 2. 兰州大学资源环境学院,兰州,730000 3. 六安市气象局,六安,237012 |
| 基金项目： | 国家自然科学基金项目(编号：40871057);安徽省高校省级自然科学重点项目(编号：KJ2011A274);安徽省人文地理学重点学科项目。 |
| 摘 要： | 降水集中度和集中期能定量地表征降水量在时空场上的非均匀性。运用淠河流域12个雨量站点1956年-2010年的逐日降水资料,基于降水集中度和集中期分析了淠河流域近55年来汛期降水的时空特征和变化规律。研究结果表明：淠河流域汛期降水集中度变化于0.69~0.11之间,多年平均值0.31,多年平均降水集中期在40~41候。汛期降水量和集中度呈比较显著的上升趋势,增大了汛期发生洪涝灾害的风险。汛期降水量和降水集中度分别在1983年、1962年发生增多突变,集中期无明显突变。汛期降水量、集中度和集中期序列近55年来都具有显著的3~4年周期振荡。汛期降水量和集中度呈比较显著的正相关,和降水集中期呈微弱负相关,即降水量越大,降水越集中,最大降水量出现的日期越有可能提前。 |
| 关 键 词： | 汛期降水量 降水集中度 降水集中期 淠河流域 |
| 收稿时间： | 8/2/2011 12:00:00 AM |
Change Characteristics of Precipitation Concentration Degree (PCD) and Precipitation Concentration Period (PCP) in the Flood Season in Pi River Valley |
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| LI Yuanping,YANG Taibao and MA Jianguo.Change Characteristics of Precipitation Concentration Degree (PCD) and Precipitation Concentration Period (PCP) in the Flood Season in Pi River Valley[J].Resources Science,2012,34(3):418-423. | |
| Authors: | LI Yuanping YANG Taibao and MA Jianguo |
| Institution: | Department of Environment and Tourism Management, West Anhui University, Liu'an 237012, China;College of Resources and Environment, Lanzhou University, Lanzhou 730000, China;Liu'an Meteorological Bureau, Liu'an 237012, China |
| Abstract: | Precipitation Concentration Degree (PCD) and Precipitation Concentration Period (PCP) could quantificationally represent the spatial-temporal inhomogeneity of the precipitation. Analysis of precipitation concentration in flood season is of great importance to taking precautions against and fighting natural adversities in Pi River Valley. With the daily precipitation data between 1956 and 2010 from 12 rainfall stations in Pi River Valley and the definitions of PCD and PCP, this paper analyzed the temporal and spatial distribution characteristics and change rule of precipitation in flood season during the past 55 years. The results show that the precipitation and PCD in the flood season in Pi River Valley have large variation range. The average precipitation is 611.4mm and the maximum (1089.6mm) is 5.4 times of the minimum (202.7mm). The PCD varies from 0.11 to 0.69 and the average is 0.31. As for the PCP, it varies from 37 to 45 pentads and the average is 40.38. Climatic Trend coefficients of precipitation, PCD and PCP in flood season are 0.182, 0.178 and -0.118 respectively. The increasing trend of PCD in flood season is very significant with a marginal value of 0.10, while the PCP exhibits a non-significant decreasing tendency. This could lead to increasing frequency and intensity of flood and waterlog in Pi River Valley. The increasing jump of precipitation in flood season occurred in 1983 and PCD occurred in 1962. On contrast, there isn't any abrupt change in PCP. The two major periods of precipitation variation in Pi River Valley during the past 55 years are 4 years and 9.5 years respectively and the two major periods of PCD are 7 years and 4 years respectively. As for PCP, the major period is 3 years. Thus it can be seen that the oscillation period of 3-4 years are noticeable in all precipitation, PCD and PCP series. Furthermore, there is 7-10 years periodic oscillation in precipitation and PCD. The relevant analysis indicates that there will be more rainstorms and earlier PCP with larger precipitation and PCD. |
| Keywords: | Precipitation in flood season Precipitation concentration degree Precipitation concentration period Pi River Valley |
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