Detachment rate in rill erosion is an important indicator of soil erosion speed and serves as the basis for estimation of soil erosion using the process-oriented model. Rill detachment rates on saturated soil slopes were numerically calculated from the dataset of the rill erosion process. The datasets of sediment concentrations were obtained from laboratory experiments, along saturated soil rills 1, 2, 4 and 8 m under slope gradients of 5°, 10°, 15° and 20° and flow rates of 2, 4 and 8 L min⁻¹, and were used to compute rill detachment rates through a numerical algorithm. The resulting rill detachment rates on saturated soil slopes ranged from 0.006 to 0.994 kg m⁻² s⁻¹. Exponential functions fitted well the rill detachment rates with rill lengths, whereas linear functions fitted well those with sediment concentrations. The rill detachment rate patterns of saturated soil slopes exhibited similar rill erosion–sediment concepts to those of non-saturated soil slopes. However, saturated soil slopes were detached considerably faster than the non-saturated soil slopes. Detachment rates of saturated soil rills were initially and considerably more rapid and decreased faster with rill length than those of non-saturated soil rills. The saturated soil rills detached 1.627 to 2.246 times the sediments of the non-saturated soil rills. This phenomenon indicates that faster rill detachments in saturated soil rills make sediment loads in water approach the sediment transport capacities faster than those in non-saturated soil rills. The computed detachment rates and the functional relationships in this work can provide a basis for determining rill erosion model parameters on saturated soil slopes.

中文翻译：

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饱和度对细沟脱离率分布的影响

细沟侵蚀的拆离率是土壤侵蚀速度的重要指标，是采用面向过程的模型估算土壤侵蚀的依据。根据细沟侵蚀过程的数据集，对饱和土坡上的细沟脱离率进行了数值计算。沉积物浓度数据集来自实验室实验，沿着 1、2、4 和 8 m 的饱和土壤细沟在 5°、10°、15°和 20° 的坡度和 2、4 和 8 L min 的流速下获得^{- 1}，并用于通过数值算法计算细沟脱离率。由此产生的饱和土壤斜坡上的细沟脱离速率范围为 0.006 至 0.994 kg m ^-2  s ^-1. 指数函数很好地拟合了细沟分离率与细沟长度，而线性函数很好地拟合了沉积物浓度。饱和土壤斜坡的细沟脱离率模式表现出与非饱和土壤斜坡相似的细沟侵蚀-沉积物概念。然而，饱和土壤斜坡比非饱和土壤斜坡分离得更快。与非饱和土壤细沟相比，饱和土壤细沟的剥离速率最初明显更快，随着细沟长度的增加而下降得更快。饱和土壤细沟分离的沉积物是非饱和土壤细沟的 1.627 至 2.246 倍。这种现象表明饱和土壤细沟中较快的细沟脱离使水中的泥沙负荷比非饱和土壤细沟更快地接近泥沙输送能力。计算的脱离率和这项工作中的函数关系可以为确定饱和土壤斜坡上的细沟侵蚀模型参数提供基础。