中文摘要：

为了加强杭州市的旱涝灾害监测和评估,利用5个气象站近50年的月降水资料,比较分析了Z指数和SPI计算结果的一致性与差异。采用频率分析、趋势变化特征分析和多尺度SPI分析等方法,研究了杭州市各站及各季旱涝的变化特征。研究表明：Z指数和SPI在计算杭州市旱涝情况结果基本一致;杭州市的干旱情况自西向东逐渐加重,洪涝反之;夏季与秋季易引起梅汛、台风洪涝和干旱交替出现。首次使用多时间尺度SPI计算杭州市的旱涝情况,为今后杭州市旱涝预测提供了一定的参考价值。

英文摘要：

In order to strengthen the monitoring and assessment of droughts as well as the flood in Hangzhou,this paper analyzes the conformability and difference between the calculated Z index and SPI,with the aid of the data collected from 5 meteorological stations.By employing such methods as frequency analysis,trend analysis and multi-scale SPI,this paper investigates the seasonal change characteristics of droughts and floods.By means of the research we find that results calculated by Z index are basically the same as those by SPI.The droughts in Hangzhou are becoming more serious from the west to the east,but the flood is the opposite.Meanwhile the plum flood,typhoon-induced floods and droughts often occur in summer and fall.The application of multi-scale Z index in this paper serves as a predication of the droughts and floods in Hangzhou in the near future.