Abstract Quantifying the role of embedded-rock fragments in soil-water processes on a slope is crucial for the application of rock fragments in soil and water conservation practice. In this study, a laboratory runoff and erosion experiment was conducted in the soils embedded with rock fragments (including five rock fragment contents (RC) of 0, 0.1, 0.2, 0.3, and 0.4 kg kg −1 ) in a metal flume under three slopes (5°, 10°, and 15°). Results showed that the mean steady infiltration rate in the soil without rock fragment (NULL) was lower than that in the soils containing rock fragments (low rock fragment contents of 0.1–0.2 kg kg −1 and high rock fragment contents of 0.3–0.4 kg kg −1 , labelled as LOW and HIGH, respectively) as slope gradient = 5°, but was higher than the latter two soils as slope gradients = 10° and 15°. Initial infiltration rate significantly increased with RC (P Re ) decreased with RC and the other hydraulic parameters of friction coefficient ( f ), shear stress ( τ ), and stream power ( ω ) increase with RC. In general, the embedded-rock fragment in the soil can accelerate soil erosion by changing the ratio of infiltration/runoff, surface roughness, and related hydraulic parameters, especially under higher slope gradients. Our findings suggest that using rock fragments to control soil erosion is workable only under the conditions of lower slope gradients and rock fragment contents.

中文翻译：

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模拟实验室条件下嵌入岩石碎片对降雨事件期间斜坡土壤侵蚀的影响

摘要 量化嵌岩碎片在边坡水土过程中的作用，对于岩屑在水土保持实践中的应用至关重要。在这项研究中，在金属水槽中嵌入了岩石碎片（包括 0、0.1、0.2、0.3 和 0.4 kg -1 的五种岩石碎片含量 (RC)）的土壤中进行了实验室径流和侵蚀实验。坡度（5°、10° 和 15°）。结果表明，不含碎石的土壤（NULL）的平均稳定入渗率低于含碎石的土壤（低碎石含量为 0.1-0.2 kg -1 和高碎石含量为 0.3-0.4 kg 的土壤）。 kg -1 ，分别标记为低和高）作为坡度梯度 = 5°，但高于后两种土壤，因为坡度梯度 = 10° 和 15°。初始入渗速率随 RC 显着增加 (P Re ) 随 RC 降低，摩擦系数 ( f )、剪切应力 ( τ ) 和水流功率 ( ω ) 等其他水力参数随 RC 增加。一般来说，土壤中嵌入的岩石碎片可以通过改变入渗/径流比、地表粗糙度和相关水力参数来加速土壤侵蚀，尤其是在较高坡度下。我们的研究结果表明，使用岩石碎片控制土壤侵蚀只有在坡度和岩石碎片含量较低的条件下才可行。土壤中嵌入的岩石碎片可以通过改变入渗/径流比、地表粗糙度和相关水力参数来加速土壤侵蚀，尤其是在较高坡度下。我们的研究结果表明，使用岩石碎片控制土壤侵蚀只有在坡度和岩石碎片含量较低的条件下才可行。土壤中嵌入的岩石碎片可以通过改变入渗/径流比、地表粗糙度和相关水力参数来加速土壤侵蚀，尤其是在较高坡度下。我们的研究结果表明，使用岩石碎片控制土壤侵蚀只有在坡度和岩石碎片含量较低的条件下才可行。