广东省区域年降雨量的时空特征分析

Spatio-temporal characteristics of regional annual precipitation in Guangdong province

研究区域年降雨量的时空分布特征,对深入理解气候变异下水文演变规律,进而有效利用水资源,减少各类自然灾害对人类生产生活造成的巨大损失具有重要意义.本研究基于1995-2018年广东省粤北、粤东北、粤西北、粤东、粤中以及粤西六个区域内代表观测站的降雨量资料,采用Mann-Kendall非参数检验、小波分析及经验正交函数等方法,对广东省区域降雨量的时空分布特征进行研究.结果表明:广东省雨量充沛,年均降雨量在1 600 mm以上.在时间维度,粤中区域具有明显的增长趋势,其他区域处于自然波动状态,年降雨量的变化周期主要为3a, 7a以及11a;在空间上维度,呈现中部多雨,东西少雨,南多北少的分布格局.

The study of the spatio-temporal distribution characteristics of regional annual precipitation is of vital importance to understand the hydrologic evolution process under the climate variation. Based on the precipitation observation data obtained from 1995 to 2018 in six regions of Guangdong province including, Mann-Kendall, wavelet analysis and empirical orthogonal function methods are used to study the Spatio-temporal distribution characteristics of regional annual precipitation. The results show that the precipitation in Guangdong province is abundant and the average annual precipitation is over 1 600 mm. In the time dimension, the central Guangdong has an obvious growth trend, while other regions are in a state of natural fluctuation. The variation periods of annual precipitation are 3 a, 7 a and 11 a. In the spatial dimension, it presents a distribution pattern of density in the middle, less dispersed around.