【摘要】 为了揭示长江、黄河流域汛期(6～8月)重旱涝的气候特征,首先采用墨西哥帽小波对长江、黄河流域1951～1999年汛期的降雨资料作分析,得到了两流域汛期降雨量的年际变化趋势;其次将长江流域划分为三段(上游、中游、下游段)、黄河流域分为两段(上中游、下游段),以各游段逐月的平均降水量(R)为基准,计算降雨量距平百分率,从而得到逐游段、逐月49年来的重旱涝的时序资料;最后分析该时序资料,得到两流域上中下游汛期重旱涝的时空分布。其结果深化了我们对重旱涝的认识。更多还原

【Abstract】 To reveal the climate characteristics of heauy drought and flood of Yangtze River valley and Yellow River valley in flood season, firstly we use Mexican Hat wavelet to analyze the precipitation data of Yangtze River valley and Yellow River valley from 1951 to 1999 and get the annual variation tendency of precipitation. Secondly, respectively divide Yangtze River valley and Yellow River valley into three reaches (upper, middle, lower reaches) and two reaches (upper-middle,down). With accepted standards of average precipitation R of each reach and month, the precipitation anomalous percentage is calculated. Thereby we obtain the time series date of each reach and month from 1951 to 1999 for heavy drought and flood. Finally, analyzing the time series data, we get the climate characteristics of heavy drought and flood of Yangtze River and Yellow River valley. The results in this paper improve our knowledge about heavy drought and flood.更多还原