为探讨北江一级支流滨江流域年内降水量的时空演变规律, 以1965 年- 2011 年逐日降水观测资料为研究数 据, 利用Mo rlet 小波分析、Mann2Kendall 检验、M ann2Whitney2 Pettitt 检定方法及线性倾向估计法, 对各月降水量进 行分析。结果表明: 汛期中流域内降水量空间差异明显, 由西北向东南呈增加趋势; 在时间分布上, 5 月、6 月的多年 平均降水量最大, 是防洪的重点关注期, 受气流及地形影响, 非汛期、汛期初和汛期末降水量比较均匀; 各月降水量 变化主要存在4~ 8 a 的短周期及11~ 14 a、16~ 19 a 和27~ 29 a 的中长周期; 4 月份全流域降水量显著减少, 且在 2001 年发生显著性突变, 而5 月份流域南部降水量显著减少, 且在1989 年发生显著性突变。

In or der to investigate the spatial and tempor al var iations of precipitat ion in the Binjiang Riv er basin, the daily pr ecipi2 tat ion dat a fr om 1965 t o 2011 w ere selected and the Mo rlet w avelet analysis, M ann2Kendall t est, Mann2Whitney2Pett itt ver ifica2 tion metho d, and linea r tr end est imatio n method w ere per formed to analy ze the monthly precipitation in t he basin. The r esults show ed that during the f loo d season, precipitat ion shows an a pparently spatial difference w ith an increasing f rom the no rthw est to the southeast; averag e precipitatio ns in Ma y and June are the larg est and close attentio n needs to be paid fo r f loo d co nt ro l; during the no n2floo d seasons, the beg inning and the end of flo od seasons, precipitat ions are evenly distr ibuted and influenced by the airstr eam and topog raphy; monthly pr ecipitations show shor t cy cle of 4~ 8 a, and intermediate and long cycles of 11~ 14 a, 16~ 19 a, and 27~ 29 a; and precipitat ion in April decreases sig nificant ly and has mutatio n in 2001 in the who le riv er basin, while pr ecipitatio n in Ma y decr eases sig nificant ly and has mutatio n in 1989 in the south of the river basin.