冻土水盐时空变异性条件模拟的初步研究

Preliminary Study on Application of Conditional Simulation Theory to Time-Space Variability of Water-Salt during Soil Freezing and Thawing

本文用地质统计学的变差函数讨论了试验区冻融土中不同时期非饱和带土壤垂向水分和盐分的时空变异性;运用条件模拟理论(简称CS)用较少的采样点再现其水盐的波动过程,并同普通Kriging最优插值法进行了对比分析和评价;同时研究了影响条件模拟Monte-Carlo试验计算精度和效率的两个重要因素——随机数种子和随机数序列长度的取值规律,得到了比较平稳的取值范围。

This paper analyzes time-space variability of water-salt in unsaturated soil of an experimental area during soil freezing and thawing (initially freezing period,maximum freezing depth period and thawing period) with their semivariogram.Conditional simulation of geostatistics is used to reproduce well the fluctuation of soil water-salt with fewer sampling points.The paper analyzes and evaluates the Ordinary Kriging method and Conditional Simulation by comparing them.The laws of values of seed of stochastic series and length of stochastic series affecting computing accuracy and efficiency of Conditional simulation are discussed in detail and the stable ranges of their values are obtained.