沙化土地表土粒度特征参数矩法计算研究

本文在对内蒙古境内几个典型沙地边缘区土样进行粒度实验的基础上,借助MATLAB分析软件对每个样品用三次方程式插值和线性插值相结合的方法计算出分析所需的数据,并进行了有关统计分析。通过研究认为,利用不同步长的粒径分段区间计算所得的粒度参数值间存在着差异,并且利用各种插值计算的参数间也存在差异;总体上粒度参数的离散情况与分段步长存在正相关;分段区间数是影响矩法计算结果的主要因素。

The Research on Surface Soil Grain-size Characteristic Parameter of Sand Land: the Calculation Way by Moment Method

Based on grain-size experiment in the fringe of several typical sands in Inner Mongolia,each sample is associated cubic equation interpolation with linearity interpolation methods by MATLAB software to figure out the required data and make relative statistical analyses. The multi-solutions of grain-size character parameter are discussed by calculation taking an example of the grain-size parameter of sand formed by wind. It shows that different grain-size of subsection leads to different grain-size parameter value,and there exists differences in parameter value using interpolation methods. As a whole,it has positive correlation between dispersion of grain-size parameter and subsection step. Subsection amount is a main factor that affects the result of moment calculating.