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在室内人工模拟降雨条件下,对6种不同碎石含量(0,5%,10%,20%,30%,40%)的土壤侵蚀产流产沙的过程进行模拟研究。结果表明:碎石含量对径流流速的影响不显著,随着碎石含量的增加,平均径流流速呈减小的趋势。碎石含量对坡面侵蚀径流含沙率影响显著(F=30.076,P<0.05),随着碎石含量的增加,径流含沙率呈降低的趋势。累积产沙量与降雨历时具有对数相关关系,碎石含量为5%时相关性最大,碎石含量越大累积产沙量递增速率越小。土壤中碎石混合通过改变土壤的物质组成和结构,增强土壤的抗蚀性和抗冲性,随着碎石含量的增加,土壤流失量逐渐减少,土壤侵蚀速率显著降低。
Simulated the process of runoff and sediment yield from six different gravels (0, 5%, 10%, 20%, 30%, 40%) under artificial rainfall indoors. The results show that: the impact of gravel content on runoff velocity is not significant, with the increase of gravel content, the average runoff velocity decreases. The gravel content had a significant effect on runoff sediment yield of slope erosion (F = 30.076, P <0.05). With the increase of gravel content, runoff sedimentation rate decreased. Cumulative sediment yield had a logarithmic correlation with rainfall duration, the correlation was highest at 5% gravel content, and the larger the gravel content was, the smaller was the incremental rate of cumulative sediment yield. The gravel mixing in soil can improve the soil anti-erodibility and anti-scourability by changing the material composition and structure of the soil. As the gravel content increases, the soil loss gradually decreases and the soil erosion rate decreases significantly.