【摘要】 利用1956-2010年淮河蚌埠以上流域内112个雨量站的逐日降水资料,采用Mann-Kendall趋势分析和小波分析方法分析了蚌埠以上流域三级水资源分区近50 a降水的时空分布特征。结果表明:(1)蚌埠以上多年平均降雨存在北部低,南部高的空间分布不均匀性,4个分区中除王蚌区间南岸降雨有递增趋势外其他均为递减趋势,整个蚌埠以上降雨有递增趋势。(2)从时间上看,MK检验显示王家坝以上北岸降雨有显著递减趋势,王蚌区间南岸降雨有较显著递增趋势,Mann-Kendall趋势检验UF曲线显示王蚌区间南岸变化趋势在整个研究时间段不显著,2003年突变降雨对统计结果影响较大。(3)蚌埠以上研究区域及分区降雨有不同的周期,但有共同的6 a左右的振荡周期。整个研究区域降雨变化特征受分区影响。更多还原

【Abstract】 Based on the daily rainfall data of 55 years from 1956 to 2010 collected by 112 precipitation stations above Bengbu lock,the Mann-Kendall test and wavelet analysis are used to analyze the spatial-temporal variation in four water resource divisions.The results indicate that average annual rainfall in the northern part of the study area is higher than that in the southern part.The rainfall of the divisions is decreasing in addition to the part of the south of Wangbang Region and there is a trend of increase in the rainfall in the whole study area.The rainfall decrease in the north of the area above Wangjiaba has gone through the Mann-Kendall test,while the rainfall in the south of the area above Wangjiaba is inclined to increase.As a result of the extreme precipitation in 2003,the UF curve shows that the trend of the rainfall in the south of the area above Wangjiaba is not significant in the whole study period.Although the cycle of the rainfall of the whole study area and the four water resource divisions was different,there was a common oscillation cycle of about 6 year.The spatial scale had effect on the research results.更多还原