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利用太湖流域106个代表雨量站的1951~2010年的逐日降水资料,通过计算降水集中度和集中期,讨论了流域降水量的年内分配不均匀分布特征。结果表明,太湖流域的降水集中度和集中期变化过程相似,均具有自北向南递减的变化特点,从长期趋势看,各分区降水集中度均呈减小趋势,集中期的变化趋势有增有减,但这两种变化趋势均不显著。年降水量与降水集中度和集中期的相关系数表明,太湖流域年降水量与降水集中度呈中度正相关,即年降水量越多(少),年内降水越集中(均匀);年降水量与降水集中期相关系数在空间上也呈正相关,但相关程度整体上不如年降水量与降水集中度的相关程度,典型时段降水量与降水集中度关系密切。
Based on the daily precipitation data of 106 representative rainfall stations in Taihu Lake Basin from 1951 to 2010, the distribution characteristics of annual precipitation distribution in the basin are discussed by calculating the precipitation concentration and concentration period. The results show that the precipitation concentration in the Taihu Lake Basin is similar to that during the concentration period, and both have the characteristics of decreasing from north to south. From the perspective of long-term trend, the precipitation concentration in each sub-region shows a decreasing trend while the increasing trend in the concentration period However, neither trend is significant. The correlation coefficient between annual precipitation and precipitation concentration and concentration period shows that there is a moderate positive correlation between annual precipitation and precipitation concentration in the Taihu Lake Basin, that is, the annual precipitation is more (less) and the precipitation is more concentrated (uniform) during the year; the annual precipitation The correlation coefficient between precipitation and quantity of precipitation is also spatially correlated, but the correlation degree is not as good as the correlation between precipitation and precipitation concentration as a whole. The precipitation in typical period is closely related to precipitation concentration.