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以室内试验槽为平台,采用人工模拟降雨试验,研究了在3种雨强下有无植被的试验槽坡面流流速、地面径流以及地面径流中Br-,NH4+和NO3-质量浓度变化.结果表明,随着降雨强度的增大,植被对降雨的截留作用明显减弱,对坡面流流速的延缓作用则呈现先增大后减小的趋势;植被对地面径流中NH4+的质量浓度变化过程影响较大,对NO3-的质量浓度影响较小;Br-质量浓度随着降雨历时的增加呈现幂函数递减趋势,且这种趋势随着降雨强度的增大趋于减缓.
Taking indoor test tank as platform, the artificial simulated rainfall test was used to study the change of flow velocity, surface runoff and the concentration of Br-, NH4 + and NO3- in the runoff of the experimental tank under the three rainfall intensities. The results show that the interception of rainfall on vegetation is obviously weakened with the increase of rainfall intensity, and the delaying effect on the flow velocity of the slope first increases and then decreases. The effect of vegetation on the mass concentration of NH4 + in surface runoff Larger, and had a smaller effect on the NO3- concentration. The Br-concentration concentration showed a decreasing power function with the increase of rainfall duration, and this trend tended to decrease with the increase of rainfall intensity.