农田土壤表层饱和导水率的条件模拟

本文简单地介绍了地统计模拟中的序贯高斯方法, 以农田土壤表层饱和导水率Ks为例, 对其分别进行了条件模拟和克立格插值, 并将条件模拟、克立格插值结果与实测数据进行了对比分析. 结果表明克立格插值具有明显的"平滑"效应, 改变了Ks数据的空间结构; 而条件模拟具有与实测数据相同的空间自相关结构, 并且对未知点的模拟值具有不确定性. 因此, 条件模拟对于研究那些具有空间不确定性且会对环境带来不良影响的风险性变量, 更具有实际意义.

Conditional simulation of soil surfce saturated hydraulic conductivity at field scale

A sequential Gaussian simulation theory of conditional simulation was briefly introduced. An example was given for simulating soil surface saturated hydraulic conductivity. The unobserved value were estimated by Kriging method and simulated by conditional simulation method. Their statistic characteristics, spatial distribution trend and semi-variances were compared. The results indicated that the estimated value by Kriging method showed obviously smoothing effect and the original data configuration has been changed, while the simulated values had bthe same data configuration as the measured values and the simulated value was uncertain for the unobserved point. So conditional simulation was suitable to analyze the uncertain and risk variants, which could bring some negative effect on environment.