A simplified model based on drag concepts is developed to evaluate the roughness coefficient for unsubmerged vegetation.
并基于阻力的概念，建立了一个简化的模型来估计菖蒲的
率系数。
A simplified model based on drag concepts is developed to evaluate the roughness coefficient for unsubmerged vegetation.
并基于阻力的概念，建立了一个简化的模型来估计菖蒲的率系数。
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