【摘要】 应用游程理论和概率点据相关系数对泾、洛、渭三河流干流在陕西境内的主要控制断面的逐日平均流量过程在０．４、０．５、０．６、０．７、０．８、０．９和１．０倍的断面多年平均流量为截取水平时的水文年（８～７月）最长连续枯水历时（天数）的概率分布做了分析。概率分布的假设线型分别为皮尔逊Ⅲ型、对数皮尔逊Ⅲ型、二参数对数正态、三参数对数正态、截尾正态和耿贝尔。结果显示，以皮尔逊Ⅲ型为优势分布，可作为泾、洛、渭流域及相似区域业务水文及水资源规划中极限枯水历时的理论分布的规范性线型更多还原

【Abstract】 Probabilistic distributions of the longest low flow durations (days) truncated from daily average streamflow processes of hydrologic year (Augest to July) by the flow of which the annual averge flow times a ratio of 0.4,0.5,0.6,0.7,0.8,0.9 and 1.0,espectively,are analysed,using the theory of runs and the those measured of probability plot correlation coefficient.The daily streamflow processes used in the analysis are those measured at hydrologic stations on the main rivers in Shaanxi of the Jing River,the North Luo River and the Wei River.The assumed theoretical probabilistic distributions are Pearson type Ⅲ,log Pearson type Ⅲ,truncated normeal,two parameter log normal,three parameter log normal and Gumbel distributions espectively.The results show that Pearson type Ⅲ is dominant in the six theoretical distributions and may be adopted as a standard theoretical distribution of the longest low flow durations in the three river basins and the area similar to the basins in operational hydrologic and water resources planning.更多还原