半月降雨侵蚀力占年侵蚀力的累积频率表，为估算土壤侵蚀方程中土壤可蚀性因子和植被覆盖—管理因子提供了基础。

The percentage table of rainfall erosivity for a half month period was used to calculate soil erodibility and vegetation coverage factors.

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运用Matlab对诺模方程进行了修正，得到了适用于公路沿线地区黄土和风沙土高速公路边坡的土壤可蚀性因子K的计算模型。

Parameters in Normal Equation are modified by using MATLAB and we can get the calculating model of K factor suitable for the Loess and Sandy slope soil of highway.

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