Analysis of Precipitation Characteristics in Anyang City Nearly 51 Years

doi:10.3969/j.issn.1673-7148.2012.04.007

Abstract：Using the method such as wavelet analysis and moving t test, Anyang city precipitation data from 1961 to 2011were analyzed. The results are as follows. 1) Anyang each station precipitation trends are consistent. Summer precipitation and the annual precipitation have the same change tendency and phase; the rainstorm general days change with summer rainfall change are more consistent; the phase of the relative variability and percentage of monthly precipitation is opposite in the annual distribution; the longest continuous precipitation days and no precipitation days change basically in reversed-phase. 2) The Anyang city rainfall diurnal variation appears two peaks and two valleys; the monthly precipitation takes July and August as center and shows normal distribution. 3) The effective precipitation days and precipitation are well correlated in spring, autumn and winter; summer precipitation and rainstorm day are closely related, rainstorm has significant contribution to summer precipitation. 4) The abrupt change of precipitation is not obvious. 5) The quarterly, annual precipitation and precipitation days present mul-tiple time scales characteristics; the large scale periodic changes are nested with small scale periodic changes; in different time scales, the corresponding precipitation structure or days change are different. The first main period of Anyang city annual precipitation is 26 a, the main period of the annual average effective precipitation days is 21 a, the main period of rainstorm days is 19 a, the main period of the lon-gest continuous (no) precipitation days is 21 a.