【摘要】 根据对野外弃土堆置体的调查结果,以前期概化的散乱锥状堆置体为研究对象,采用室内人工模拟降雨试验,研究4种土石比例弃土堆置体在4种不同降雨强度下的产流产沙特征。结果表明:各土石比例弃土堆置体的径流率随降雨时间呈波动式增大,侵蚀速率随降雨时间呈稳定、波动2种变化趋势;平均径流率、平均侵蚀速率与降雨强度呈线性关系。在相同降雨强度下,平均径流率和平均侵蚀速率均随含石量的增大而减小。总产沙量与总径流量呈线性关系。在相同降雨强度下,随着砾石含量的增大,弃土堆置体的总径流量和总产沙量减小。在降雨强度为2.5mm/min条件下,土石比例为9∶1,8∶2,7∶3弃土堆置体的总产沙量与纯土堆置体相比分别减少了29%,41%,42%。更多还原

【Abstract】 According to the investigation results of spoilbank in the field,the type of scattered conical spoilbank was selected as research object based on previous research generalization.Then,the runoff and sediment characteristics of four different soil-stone ratio spoilbanks under four different rainfall intensities was studied by indoor artificial rainfall simulation experiments.The results showed that the runoff rate of spoilbanks with different soil-stone ratio increased in a fluctuating tendency with rainfall time,while the erosion rate appeared in two types,which were stability and fluctuation.Rainfall intensity had a linear function relation with average runoff rate and average erosion rate.With the increase of gravel content,average runoff rate and average erosion rate decreased in the same rainfall intensity.Total sediment yield had a linear function with runoff volume.In the same rainfall intensity,with the increase of gravel content,the total sediment yield and runoff volume decreased correspondingly.Under the rainfall intensity 2.5mm/min,compared with soil spoilbank,the total sediment yield of soil-stone ratio with 9∶1,8∶2,7∶3decreased by29%,41%,42%,respectively.更多还原