论文部分内容阅读
利用室内人工模拟降雨试验,研究弃渣前期含水量在不同降雨强度条件下对土壤坡面入渗、产流和产沙特性的影响。结果表明:弃渣坡面入渗率随时间呈幂函数变化。在雨强较小(0.64mm/min)的情况下,含沙率在产流初期会出现峰值,之后随时间递减,前期含水量越高,峰值出现的越早,土壤前期含水量对土壤侵蚀量的影响符合幂函数变化规律。在1.05mm/min降雨强度条件下,含沙率变化呈波动性增长趋势,无明显峰值。土壤前期含水量对土壤侵蚀量影响呈二次多项式关系,计算得出土壤流失量最少的最优前期含水量为9.65%。
Indoor artificial simulated rainfall experiment was conducted to study the effect of pre-residue moisture content on soil infiltration, runoff and sediment yield under different rainfall intensities. The results show that the slope infiltration rate changes with the power function over time. In the case of a small rainfall intensity (0.64mm / min), the sediment yield peaked at the initial stage of flow production and then decreased with time. The higher the pre-stage water content, the earlier the peak appeared and the earlier soil moisture content affected soil erosion The influence of the quantity conforms to the law of power function variation. Under the rainfall intensity of 1.05mm / min, the change of sediment concentration showed a trend of increasing with no obvious peak. The effect of pre-soil water content on soil erosion showed a quadratic polynomial relationship, and the optimal pre-soil water content with the least amount of soil loss was 9.65%.