大气环境影响预测中标准正态函数计算方法分析

Thinking on Planning Environmental Impact Assessment

污染物在空间中满足正态分布规律是现有法规大气环境影响评价模式的前提假设,标准正态函数的计算方法制约着大气预测结果的精度与速度。本文按照目前流行的三种算法,使用VB.NET统一编写了正态函数的计算程序,在计算精度控制在0.0001的前提下进行了测试比选,结果表明利用误差函数的级数表达式可在指定精度下获得最快的计算速度。

The pollutant satisfies the normal distribution rule in the space is the existing laws and regulations atmospheric environment influence appraisal pattern premise supposition, the standard Normal mode function computational method is restricting the atmospheric forecast result precision and the speed. This article according to the present popular three algorithms, used the VB. NET unification to compile the Normal mode function computational procedure, Carried on the test ratio in the computation precision control under 0.0001 premise to elect. The result indicated may in assign under the precision using the error function progression expression to obtain the quickest computation speed.