Rock fragments on the soil surface protect the soil against erosive agents. However, the effect of rock fragments cover on rill initiation is not well documented. The objective of this study was to evaluate the effect of rock fragment cover and the rate of flow discharge on distance and time rill initiation. The investigation was conducted using a flume with 6 m length, 0.5 m width and 3% gradient. The treatments included rock fragment cover (0, 10, 20, 30%) and three levels of flow discharge (3, 6, 9 L min-1). The results showed that the surface cover of rock fragment had significant effect on different erosion processes, as well as rill initiation. Moreover, results indicated that velocity of water flow and the Froude number decreased but the Manning roughness coefficient increased (0.012-0.115 m-1/3 sec) with an increase in rock fragment cover, whereas the Reinhold?s number remained nearly the same with a small variation among different rock fragment cover percent. This variable was increased with increasing flow discharge. In addition, distance and time of rill initiation increased with a rise in rock fragment cover and diminished with increasing flow discharge.
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机译：土壤表面的岩石碎片可保护土壤免受侵蚀。但是，岩石碎片覆盖对小溪发动的影响尚未得到充分记录。这项研究的目的是评估岩石碎片覆盖和流量排放对距离和时间钻探开始的影响。使用长度为6 m，宽度为0.5 m且梯度为3％的水槽进行调查。处理包括岩石碎片覆盖率（0、10、20、30％）和三个水平的流量排放（3、6、9 L min -1 ）。结果表明，岩石碎屑的表层覆盖对不同的侵蚀过程以及成孔作用具有显着影响。结果还表明，随着碎石覆盖率的增加，水流速度和弗洛德数减小，但曼宁粗糙度系数增加（0.012-0.115 m -1 / 3 sec），而Reinhold？ s的数量几乎保持不变，不同岩石碎片覆盖率之间的差异很小。随着流量增加，该变量增加。另外，随着岩石碎片覆盖率的增加，钻探开始的距离和时间也会增加，而随着流量的增加，钻探开始的距离和时间会减少。
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