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首页> 外文期刊>Geoderma: An International Journal of Soil Science >A rational method for estimating erodibility and critical shear stress of an eroding rill.
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A rational method for estimating erodibility and critical shear stress of an eroding rill.

机译：一种估算侵蚀小钻的可蚀性和临界剪切应力的合理方法。

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摘要

Soil erodibility and critical shear stress are two of the most important parameters for physically-based soil erosion modeling. To aid in future soil erosion modeling, a rational method for determining the soil erodibility and critical shear stress of rill erosion under concentrated flow is advanced in this paper. The method suggests that a well-defined rill be used for shear stress estimation while infinite short rill lengths be used for determination of detachment capacity. The derivative of the functional relationship between sediment yield and rill length at the inlet of rill flow, as opposed to average detachment rate of a long rill, was used for the determination of detachment capacity. Soil erodibility and critical shear stress were then regressively estimated with detachment capacity data under different flow regimes. Laboratory data of rill erosion under well defined rill channels from a loess soil was used to estimate the soil erodibility and critical shear stress. The results showed that no significant change in soil erodibility (Kr) was observed for different slope gradients ranging from 5 to 25 while critical shear stress increased slightly with the slope gradient. Soil erodibility of the loess soil was 0.3211+or-0.001 s m-1. The soil erodibility and critical shear stress calculations were then compared with data from other resources to verify the feasibility of the method. Data comparison showed that the method advanced is a physically logical and feasible method to calculate the soil erodibility and critical shear stress for physically-based soil erosion models.
机译：对于基于物理的土壤侵蚀建模，土壤可蚀性和临界切应力是两个最重要的参数。为了帮助将来的土壤侵蚀建模，本文提出了一种合理的方法来确定浓水条件下小孔侵蚀的土壤易蚀性和临界切应力。该方法建议使用定义明确的钻具进行剪切应力估算，而将无限短的钻具长度用于确定分离能力。与长条钻的平均分离速率相反，使用钻屑流入口处的沉积物产量和钻长之间的函数关系的导数来确定分离能力。然后，根据不同流态下的分离能力数据，对土壤的侵蚀性和临界剪切应力进行回归估计。利用黄土中明确定义的小河通道下的小河侵蚀实验室数据来估算土壤的可蚀性和临界切应力。结果表明，在5至25范围内的不同坡度下，土壤可蚀性（Kr）均未观察到明显变化，而临界剪切应力随坡度而略有增加。黄土的土壤易蚀性为0.3211+或-0.001 s m-1。然后将土壤易蚀性和临界剪应力计算与其他资源的数据进行比较，以验证该方法的可行性。数据比较表明，该方法是一种物理上可行的方法，可以为基于物理的土壤侵蚀模型计算土壤可蚀性和临界切应力。

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