| Precipitation is a main contribution to water resources and its analysis plays an important role in protecting water resources, alleviating flood and draught. In this paper, we analyzed the spatiotemporal variation of precipitation in Liao Province using the precipitation data measured from 16 weather stations across the province. The analysis was based on residual mass curve of modulus coefficient, pre-whitening Mann-Kendall and the wavelets methods. The results showed that the maximum annual precipitation is 1.3 times more than the minimum, and the precipitation from July to August accounted for 50% of annual precipitation. There was more precipitation in the eastern mountainous areas than in the western plain in the province. The statistics U calculated from the PW-MK for Huanglatuo Station, Liaoyang Station and Tanghe Reservoir Station was -0.85, -1.19, -1.43, with anabrupt in the 1960s. The wavelet analysis showed noticeable periods of 3~4 a, 10~11 a, 25~35 a in the precipitation. In 1951—2014, the precipitation is not uniform within a year, and the annual precipitation varied widely followingthe cycle of wet-dry-wet-dry. In summary, the precipitation decreased during the studied period with an abrupt change in the 1960s. Annual precipitation repeated periodically after each 25~35 a, with 10~11 a period and 3~4 a period further nested in the main period. |
