摘要
介绍了频率组合法基本原理和方法,分析了自然条件下干旱发生的影响因素和频率组合法自身特点,对该方法在干旱频率分析中应用的可行性进行了初步论证,将其应用到泾河流域的干旱频率分析中,把降水和天然径流系列进行组合得到新的干旱变量。通过组合计算,可得出不同频率下降水与地表河川径流同时遭遇干旱的情况,使其可行性和有效性再次得到证实。通过尝试,证实频率组合法理论推导严密、操作过程简单、结论可信度高,是进行干旱频率分析和预测的重要手段。
Abstract： Based on the introduction of theory of frequency combination method, the paper analyzes the influence factors of drought occurrence and the features of this method, and demonstrates the feasibility of applying this method in drought analysis. By using the frequency combination method in Jinghe Basin, a new drought variable is formed with precipitation and natural runoff. Through combination and calculation, the condition of drought co-occurrence of precipitation and runoff can be predicted under different frequency, and the feasibility and validity of the method is further proved. The frequency combination method is proved to be accurate in deduce, simple in operation and reliable in results, and can be used as an important measure to predict drought.
出处
《干旱地区农业研究》
CSCD
北大核心
2006年第2期195-199,共5页
Agricultural Research in the Arid Areas
基金
国家科技部项目"中国西北不同生态地域山川秀美试验示范区建设与重大难题研究"(2002BA901A43)
关键词
频率组合法
干旱
频率分析
泾河
frequency combination method
drought
frequency analysis
Jinghe River
