河套灌区地下水位的空间变异性及其克里金估值  

Spatial Variability of Water Level in Hetao Irrigation District of Inner Mongolia and Their Estimations by the Kriging

作　　者：王卫光[1] 薛绪掌[2] 耿伟[2] 

机构地区：[1]河海大学水资源环境学院 [2]国家农业信息化工程技术研究中心,北京100891

出　　处：《灌溉排水学报》2007年第1期18-21,共4页Journal of Irrigation and Drainage

基　　金：国家自然科学基金和黄河基金联合资助项目(50239090)

摘　　要：对1997-2001年河套灌区203个观测井的年均井水位高程进行常规的统计分析和地统计学分析,结果表明地下水位高程分布符合正态分布,实验半变异函数符合一般的球状模型。从获得的参数可知,1997-2001年期间,水位高程的相关尺度各年均存在着表现相似的几何各向异性,在搜索方向为310°左右时为变程长轴,变程大约134 km,在40°左右为相应的短轴,变程大约为60 km。同时各个年份计算结果均显示有块金值,说明在小于变程的空间尺度上仍然存在随机效应。最后运用克里金方法对该河套灌区的地下水位高程进行了空间插值成图。Geostatistical methods have been expanded to many other scientific fields for their unique statistical and interpolating advantages. In this paper, we applied ordinary kriging technique, one of the geostatistical methods, to analyze the spatial variability of annual water lever at 203 observation wells for this watershed during the period from 1997-2001. The result revealed that the semi-variograms of water lever were best described by spherical variogram model. The final parameters attained indicated that the range of every year presented geometry anisotropy. The maximal range, about 134 km and minimal range, about 60 km were from the search in the direction of 310° and 40°, respectively. In the meantime, studies indicated the existence of nugget effect in each year, which may be primarily caused by random factors at a spatial scale less than the range. After the analysis of water lever data using kriging technique, the spatial distributions of mean annual water lever were generated.

关 键 词：地下水位 地统计学 空间变异 克里金方法 

分 类 号：P641.2[天文地球—地质矿产勘探]