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在水文工作中,经常的是经验频率法排频,对降雨进行频率分析,便可得知典型频率下的降雨量,从而合理安排水稻的需水补给工作。采用P-Ⅲ型无偏频率公式对降雨数据进行频率分析,并对频率进行降序的排列,并用适线法作图,得出丰水年、平水年和枯水年。根据模糊优先比原理确定缺水期的代表年,从而对于缺水年的其他方面的研究提供依据。
In hydrological work, frequency of experience is frequently used, and the frequency of rainfall is analyzed to get the rainfall at typical frequencies so that water supply for rice can be reasonably arranged. The P-Ⅲ unbiased frequency formula is used to analyze the frequency of rainfall data, and the frequency is arranged in descending order. By using the fitting method, the wet year, the plain water year and the dry year are obtained. According to the principle of fuzzy priority ratio, the representative year of water shortage period is determined, which provides the basis for other aspects of water shortage years.