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中文摘要: 运用Z指数法对拉萨历年汛期（6～9月）的旱涝等级进行划分；并分析了实际日降水量≥5mm日数、相当日降水量≥5mm日数与旱涝等级的关系。结果表明：Z指数法所划分的旱涝等级与实际情况吻合；相当日降水量≥5mm日数不仅对汛期雨水的丰欠具有决定性的作用，而且与旱涝等级有着极好的相关性。
中文关键词: Z指数，旱涝等级，相当日降水量≥5mm日数
Abstract:The severity of drought/flood is divided by Z index in flood season in Lhasa,Tibet. Then the correlation between 5mm and over precipitation equivalent days and the drought/flood severity was studied. Results show that the severity which determined by Z index tally with the facts. The 5mm and over precipitation equivalent days not only indicate the precipitatiion in flood season but also express high correlation with drought/flood severity.
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引用文本：
向毓意,许燕,1998.拉萨5mm以上降水日数与旱涝的关系[J].气象,24(5):39-41.
,1998.The Correlation Analysis between 5mm and over Precipitation Days and Drought/flood in Lhasa[J].Meteor Mon,24(5):39-41.
向毓意,许燕,1998.拉萨5mm以上降水日数与旱涝的关系[J].气象,24(5):39-41.
,1998.The Correlation Analysis between 5mm and over Precipitation Days and Drought/flood in Lhasa[J].Meteor Mon,24(5):39-41.