Multiple Methods for Homogeneity Analysis of Precipitation Series in Vinh Phuc Province

This paper presents multiple statistical methods consisting of cumulative deviations (Cd), Bayesian (Ba), Worsley’s likelihood ratio (Wo), and von Neumann’s ratio (vN) tests that can be applied to the homogeneity analysis of precipitation series. Vinh Phuc province, an adjacent area of the economic triangle named Ha Noi—Hai Phong—Ha Long in North Vietnam, is used for demonstrating the methods. The series of daily rainfall in the long period between 1/1/1975 and 31/12/2021 at eight meteorological locations in the province are applied. The results depict that the Cd, Ba, and Wo value changes in the permitted range. In detail, the Cd value ranges from 0.23 to 4.34, while the Ba value changes between 0.17 and 2.63, and the vN value varies from 0.16 to 3.51. The Wo showed that almost rainfall series at the studied locations are homogeneity, with the Wo value ranging from 0.13 to 2.66. The series of rainfall at almost locations illustrates homogeneity, and thus, these data can be used for assessing rainfall variability, trend analysis, and for input data in relevant calculations. The Cd, Ba, and vN tests showed similar homogeneity results.