关键词: 山东省, 降水集中度, 降水集中期, 非均匀性

Abstract:

Based on the daily precipitation data of 121 meteorological stations in Shandong Province from 1961 to 2010, the characteristics of the spatial and temporal distribution and variation of precipitation concentration degree (PCD) and precipitation concentration period (PCP) were analyzed by using climate tendency coefficient, Mann-Kendall test, Moving t-test, Morlet wavelet analysis, correlation analysis, synthetic analysis, and so on. The results showed that the annual PCD ranged between 0.55 and 0.70 in Shandong Province during 1961-2010, and the high values of PCD distributed in the northwest, the central mountains and peninsula of Shandong Province. The annual PCP ranged from 37 to 46 five-day, which showed obvious regional difference. The annual average PCD and PCP were 0.62 and 43 five-day during 1961-2010 respectively. The climatic tendency of PCD in each station wasn’t significant, while that of PCP decreased obviously in Qingyun and Fucheng stations and increased significantly in Haiyang station during 1961-2010. The annual PCD and PCP didn’t change abruptly mutation from 1961 to 2010, and existed the dominant oscillation periods with five years and eight years cycle. The spatial distribution of PCD and PCP in high flow years and low flow years were obviously different. The annual precipitation was positively correlated with the annual PCD in Shandong Province, while it was positively correlated with the annual PCP as a whole, but the correlation coefficients were more different.

Key words: Shandong Province, precipitation concentration degree (PCD), precipitation concentration period (PCP), inhomogeneity