克立格方法在建立平均速度场数据库中的应用

Application of Kriging Technique to Establishing the Database of Average Velocity Field

考虑平均速度场的精度和运算速度， 提出了一种基于多方向实验变差函数的择优选取算法。将网格化、估值及平面平滑用克立格方法来统一， 分析了ＶＳＰ平均速度、声波平均速度和速度谱平均速度之间的相互关系， 并讨论了空间标定和平面平滑对平均速度场的作用和影响。实际应用结果表明， 在建立平均速度场数据库中， 克立格方法有助于提高平均速度场的精度和克服窗口平滑存在的不足， 且在统计意义下试验区３ 种平均速度的排列顺序为： 速度谱平均速度大于ＶＳＰ平均速度， ＶＳＰ平均速度大于声波平均速度。

A priority algorithm based on multi directional semivariogram is proposed in consideration of the precision and operational speed of average velocity field The interrelation of average velocities of VSP,sonic wave and velocity spectrum is analyzed by unitizing griding, estimating and planar smoothing with Kriging technique The effect of spatial calibration and planar smoothing on average velocity field is discussed The application of Kriging technique demonstrates that it is useful for improving the precision of average velocity field and overcoming the shortcoming in window smoothing Statistically, the order of arranging three kinds of average velocity is that the average velocity of velocity spectrum is larger than the VSP's and the VSP's is larger than the sonic wave's