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通过变坡钢槽装土和人工降雨的室内模拟试验,分析了黄土区裸露土质路和被草土质路(被草土质路种植早熟禾)路面的产流产沙过程及被草土质路的防蚀效果.结果表明:在相同雨强和坡度条件下,研究区被草土质路的径流系数大于裸露土质路;两种路面的径流系数均随着雨强和坡度的增加而增大;不同雨强、相同坡度条件下,径流系数与降雨历时呈对数关系,径流系数与雨强、坡度呈二次函数关系;两种路面的土壤侵蚀速率均随着雨强和坡度的增加而增大;相同降雨条件下,被草土质路的土壤侵蚀速率低于裸露土质路;在不同雨强条件下,被草土质路的平均减沙效益达47.22%;在不同坡度条件下,被草土质路的平均减沙效益达26.24%;被草土质路通过增加路面糙度和增大路面阻力可降低水流搬运泥沙的能力,起到了减少路面产沙量的作用.
The runoff and sediment production process of the bare soil road and the grass soil road (grassland-grown Poa pratensis) on the Loess Plateau and the corrosion resistance of the grassy soil road The results show that under the same rainfall intensity and slope conditions, the runoff coefficient of the grass-soil road in the study area is larger than that of the bare earth road, and the runoff coefficient of both road surfaces increases with the increase of rainfall intensity and slope gradient. Under the same slope conditions, the runoff coefficient is logarithmically related to the rainfall duration, and the runoff coefficient shows a quadratic function relationship with rainfall intensity and slope. The soil erosion rate increases with the increase of rainfall intensity and slope; Under rainfall conditions, the soil erosion rate of grass-soil-quality road was lower than that of bare soil road; under the condition of different rainfall intensity, the average sediment yield of grass-soil quality road reached 47.22%; under different slope conditions, Sediment benefits can be reduced by 26.24%. By increasing the roughness of the pavement and increasing the resistance of the pavement, the grass-soil quality can reduce the ability of the water flow to carry sediment and reduce the sediment yield of the pavement.