摘要
详细介绍了指示克立格估值计算的理论和方法。以指示变异函数为基本工具分析了华北某地区第四系含水层渗透性空间分布的结构特征,结果表明该地区含水层渗透性存在明显的各向异性特征。水平方向上,X轴方向的相关性较Y轴方向的好,Z轴的相关性最差。用指示克立格法对未采样点处进行估值,估值结果显示含水层渗透性由山前向滨海逐渐变低,在垂直方向上,渗透性变化不明显,浅部比深部略好;同时给出了估计精度,并认为对估计精度不高的区域可通过增加适当的工程加以控制。最后用交叉验证法对估值结果进行了检验,证明建立的指示变异函数模型合理且估值效果较好。这一实际应用表明指示克立格法可以很好地描述第四系含水层渗透性的空间分布规律。
In this paper, we give a detailed description of the indicator kriging theory and method. Using the indicator variogram as a main tool, we have analyzed the structural characteristics of the spatial distribution of the permeability of the Quaternary aquifer of a certain area in north China. The results indicate that the distribution of permeability in this area exhibits clear anisotropy. By applying the indicator kriging,we have constructed a spatial structural model. From the piedmont plain to the coastal area, the permeability of the aquifer decreases gradually along the horizontal direction and even in the vertical direction. Eventually, after checking the parameters of the structural model ,it is found that the constructed indicator variogram models are reasonable and the estimated values are effective. The application of the indicator kriging to estimating the permeability of the Quaternary aquifer indicates that the indicator kriging can precisely describe the regularity of the spatial distribution of permeability of an aquifer.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2005年第U04期146-151,共6页
Earth Science Frontiers
基金
国家自然科学基金资助项目(40072079)
