Variation of characteristics of waterlogging by rain over southern China in the last half century
Variation of characteristics of waterlogging by rain over southern China in the last half century
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作者：
L. Fen
利用全国629个气象站1950 ~ 2000年的月降水资料，以Z指数为旱涝判别标准，计算了秦岭淮河以南地区的涝渍范围，分析了我国南方涝渍的发生发展规律。研究表明，我国南方地区的涝渍范围有略有减少的趋势。涝年以1954年最严重，其次为1983年、1998年和1961年.除11 ~ 12月外，冬半年~夏半年内涝范围呈增大趋势，除6、7、8月外，夏半年内涝范围呈减小趋势，尤其是1990年以来，这种趋势更为显著。同时，研究还发现，从60年代后期开始，半年~冬前后的涝渍范围有5~7年的明显变化周期，而夏前后半年的涝渍范围有2年左右的变化周期。
Based on the monthly rainfall data of 629 meteorological stations in China from 1950 to 2000, the waterlogging scope in the region from Qinling Mountain and Huaihe river to the South China is calculated with Z-index as the standard to determine drought and waterlogging, the laws of waterlogging’s occurrence and development in the south of China are analysed. The study shows that the waterlogging scope in the south of China has a slightly decreasing tendency. The most severe year of waterlogging is 1954, following it are 1983,1998 and 1961. It is also found that the waterlogging scope has an increasing tendency in half year ~around winter except November December and a decreasing tendency in half year around summer except June, July and August, these tendencies are more notable especially from 1990. In the meantime, the study also reveals that the waterlogging scope in half year ~around winter has an obvious variation period of 5~7 years from the late 1960’s, but in half year around summer the variation period is about 2 years.