基于GIS和RDA唐山市降水量空间分布及其影响因素

Spatial distribution of precipitation in tangshan city and its influencing factors based on GIS and RDA

以唐山市各气象站点年均降水量为目标变量,以地形、下垫面、海陆位置因素为解释变量,采用GIS与RDA分析方法,定量分析了唐山市降水量空间分布特征及其影响因子。结果表明,唐山市降水量空间变化范围介于570~783mm之间,呈自北向南递减分布特征;冗余分析显示,地形因子是区域降水量空间变异性的主导因素,其综合解释了21.4%的信息,下垫面和海陆位置是次要因素,分别解释了18.5%、21.4%的信息。

Taking the average annual precipitation of th e meteorological stations in tangshan city as the target variable,using the topography, undersurface and land and sea position factors as the interpretation variables, the spatial distribution characteristics of precipitation in tangshan city and its influencing factors were quantitatively analyzed by using GIS and RDA analysis methods. The results show that the spatial variation of precipitation in Tangshan city ranges from 570 to783 mm, showing decreasing distribution from north to South. Redundancy analysis shows that the terrain factor is the dominant factor in the spatial variability of regional precipitation. Its comprehensive interpretation of 21.4 % of the information, the underlying surface and the land and sea position are secondary factors, explaining 18.5% and 21.4% of the information, respectively.