Impact of vegetation arrangement and slope gradient on the overland flow Froude number
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Abstract:
To explore the impact of vegetation arrangement and slope gradient on the overland flow Froude number Fr, in order to reveal the inherent law of overland flow Froude number Fr. [Method] Using artificial simulation tests, we systematically studied the relationship between Fr and K value, which is the friction surface area of a unit floor area, under different conditions including six slope gradients and three angles between the vegetation arrangement direction and water flow direction. [Results] In non-submerged flow, with the increase of K , Fr would decrease first and then tend to be steady, and the value of Fr would increase with the increase of slope gradient. Within a certain range of slope gradient, with the same gradient, when Fr>1, with the same K value, the bigger the direction angle, the smaller the Fr; when Fr<1, the situation was the other way around. With the same angle and the same K, the greater the gradient, the greater the corresponding Fr. [Conclusion] At a certain gradient, when the slope vegetation arrangement varies, the Froude number Fr value varies as well. The slope gradient is one of the important factors that influence Fr value range.
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