东北三省月降水量的时空克里金插值研究  

Study on Spatial-temporal Kriging Interpolation of Monthly Precipitation in Three Provinces of Northeast China

作　　者：李莎[1,2] 舒红[1] 徐正全[1] 

机构地区：[1]武汉大学测绘遥感信息工程国家重点实验室,湖北武汉430079 [2]湖北第二师范学院机电系,湖北武汉430205

出　　处：《水文》2011年第3期31-35,共5页Journal of China Hydrology

基　　金：半干旱气候变化教育部重点实验室(兰州大学)开放基金项目;国家高技术研究发展计划项目(2008AA12Z201)

摘　　要：为了实现对时空场任意点进行时空插值,以东北三省1999-2008年的月降水数据为研究对象,选用了一类比较实用的积和式时空变异函数模型进行时空克里金插值。每个站点的降水量都是时间序列,插值之前对各站点的降水进行了时序分解和去季节项处理。在分别得到纯空间和纯时间的变异函数基础上建立时空变异函数。将二维的普通克里金插值扩展为三维,并对1999年10月各站点进行降水量估计,同时与单纯空间克里金插值效果进行比较。结果表明时空插值效果理想,因为同时考虑了空间、时间的相关性,插值精度较空间克里金更高。In order to realize spatial-temporal interpolation at any point in space-time field,a kind of practical product-sum model of spatial-temporal variograms was chosen for monthly precipitation in the three provinces of Northeast China from 1999 to 2008.As every station＇s precipitation can be regarded as a time series,decomposition was processed and seasonal part was removed.Spatial-temporal variogram was built based on the ones of pure space and pure time.Extending 2d-Kriging to 3d,the rainfall of all stations in October 1999 was estimated,and the effect was compared with spatial Kriging＇s.The result of compare shows that spatial-temporal interpolation is practical,and because of considering the correlation of both space and time,its accuracy is better than that of spatial Kriging.

关 键 词：克里金插值 时空相关 变异函数 降水量 

分 类 号：P333[天文地球—水文科学]