论文部分内容阅读
为研究降雨因素在土壤表面结皮发育过程中的作用,结合物理模型实验方法和基于物理概念的水文响应数值模拟,以土壤表面的饱和水力传导系数Ks值作为评价指标,研究分析了雨强和累积降雨量两个降雨因素对结皮发育程度的影响。结果显示:Ks值随累积降雨量的增加而减小,且在累积降雨量较小时,Ks的减小速度更快,约为后期速度的23倍;最终累积降雨量近似的情况下,雨强较大时Ks更容易达到一稳定值;在降雨过程中,雨强与Ks的关系前后不一致。研究结果表明:降雨过程中结皮发育是个复杂的动态变化过程。
In order to study the role of rainfall in the development of soil surface crust, combined with the physical model experimental method and the numerical simulation of hydrological response based on the physical concept, the Ks value of saturated hydraulic conductivity of the soil surface was taken as the evaluation index, Effect of two rainfall factors on the development of crusts. The results showed that the Ks value decreased with the increase of cumulative rainfall, and the Ks decreased more rapidly with a smaller cumulative rainfall, about 23 times of the latter. In the case of an approximate cumulative rainfall, the rainfall intensity Ks is easier to reach a stable value when it is larger, and the relationship between rainfall intensity and Ks is inconsistent before and after rainfall. The results show that the development of crusts during rainfall is a complex and dynamic process.