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中文摘要：
研究东江流域1951-1988年最大半小时降雨量的年内分布和空间分布规律，发现最大半小时降雨量平均值在时空分布上与降雨量平均值分布基本一致，认为最大半小时降雨量时空分布特征相当程度上受气候和地形因素的影响。研究还发现东江流域最大半小时降雨量1951-1988年总体趋势为递增，1971年以前和1971以后的两时期最大半小时降雨量年内分布上发生结构性变化。
英文摘要：
This paper studied regularities of spatio-temporal distribution over the Dongjiang River Basin from 1951 to 1988. It was found that the spatio-temporal distribution of the mean of maximum half-hour rainfall is similar to the mean of precipitation＇s, considering that climate and landform are the significant influencing factors to the spatio-temporal distribution of the mean of maximum half-hour rainfall. And it was also found that the maximum half-hour rainfall over the basin showed the significant increasing trend in the period from 1951 to 1988, there was a structural change of distribution in a year of maximum half-hour rainfall after 1971.
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