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土壤表面不规则的团聚体（随机糙度）和方向一定的垄（特定糙度）能降低风蚀量。风蚀方程（ＷＥＱ）中的土壤糙度系数表示土壤表面的不平整度对风蚀的影响。风蚀方程未修正之前，土壤糙度系数仅适于垄向与风向垂直的情况，而没有考虑垄和团聚体同时存在及地表被降雨玻坏后的情况。修正的风蚀方程（ＲＷＥＱ）中的土壤糙度系数（Ｋ′）克服了以前土壤糙度系数的局限性，既包含了垄（特定糙度）和不规则团聚体（随机糙度）同时存在的情况，又包含了地表被降雨径流破坏后的情况，而且，还包含了垄向与风向成任意角度的情况。
Irregular aggregates (random roughness) and certain ridges (specific roughness) on the soil surface can reduce the amount of wind erosion. Soil roughness coefficient in wind erosion equation (WEQ) indicates the effect of soil surface roughness on wind erosion. Before the wind erosion equation was uncorrected, the soil roughness coefficient was only suitable for the ridge and the vertical wind direction, but did not consider the simultaneous existence of ridge and aggregate and the surface after the rainfall was damaged. The soil roughness coefficient (K ’) in the modified wind erosion equation (RWEQ) overcomes the limitations of previous soil roughness coefficients, including both ridge (specific roughness) and irregular aggregates (random roughness) But also the situation after the surface was destroyed by rainfall runoff. In addition, it also includes the situation where the ridge and the wind direction form an arbitrary angle.