【摘要】 以室内试验槽为平台,采用人工模拟降雨实验,研究粉砂壤土大孔隙对坡面出流、坡面流流速、坡面流阻力系数、曼宁糙率、雷诺数、弗劳德数和坡面累积产沙量的影响.结果表明,在粉砂壤土中,相对于无大孔隙试验槽,含有大孔隙的试验槽的坡面阻力系数和曼宁糙率较大,而坡面出流量、坡面初始出流时间、雷诺数、弗劳德数坡面流流速,以及坡面累积产沙量则较小.两坡面流的流态均为层流和缓流,累积产沙量随时间的变化过程可用幂函数描述.更多还原

【Abstract】 Based on indoor soil tank experiment and the artificial rainfall simulation,the effects of macropore in silt loam on various parameters are analyzed,such as the slope outflow,the velocity of overland flow,resistance coefficient,manning roughness,Reynolds number,Froude number and slope cumulative sediment yield.The results show: resistance coefficient and manning roughness in macropore soil tank are larger than the ones in non-macropore soil tank,but the amount of slope outflow,the initial time of slope outflow,Reynolds number,Froude number and slope cumulative sediment yield are less than those in non-macropore soil tank.The flow patterns in both slopes are laminar flow and slow flow.The power function can describe the relationship between the amount of cumulative sediment yield and the time.更多还原