中文摘要：

为了研究关中平原区坡面细沟侵蚀过程,利用定水头冲刷试验,系统研究了6个坡度（2°、4°、6°、8°、10°、12°）、5个流量（8L/min、16L/min、24L/min、32L/min、40L/min）工况下的细沟水流含沙量及其与各水动力学间的耦合关系。结果表明：不同流量和坡度下,细沟断面流速随细沟断面的增加而呈波动性增加。断面流速与流量及断面呈显著性相关,而与坡度和平均含沙量相关性不大;不同流量和坡度条件下,含沙量随冲刷历时的增加,先急剧降低,然后呈微小波动趋势,最终归于稳定。含沙量与流量和坡度呈显著幂函数关系增加;挟沙饱和系数K变化范围为10.17~295.66,对应的不淤保证率约为73%。K随流量和坡度的增大逐渐增加,但增加的趋势逐渐减缓。由此可知,挟沙水流的剥蚀能力是有限度的。

英文摘要：

Water scour experimental study on rill flow sediment concentration is conducted, by 6 slopes （2°, g°, 6°, 8°, 10° and 12°） , and 5 flows （8 L/min, 16 L/min, 24 L/min, 32 L/min, 40 L/min）. Results show that sectional velocity increases with the increase of volatility in the cross section of the groove. The sec- tional velocity has extremely significant correlation with flow rate and the cross section, but no significant cor- relation with slope and sediment concentration. Under the condition of different flow discharge and slope, sedi- ment concentration increased volatility after sharply reduced in the beginning, and stabilized finally. Sediment transport saturation coefficient K range with 10. 17 -295.66, corresponding nondeposit assurance rate is roughly 73%. Parameter K increases with the flow and slope, but increased gradually slowing down. As a re- sult, erosion ability of sediment laden flow is limited.