论文部分内容阅读
通过雨滴的打击加速土壤表面溶质迁移至地表径流过程。通过设计3种水文条件即控制排水状态(-5cm)、土壤水分饱和状态和土壤渗流状态(5cm),采用人工模拟3种降雨强度(30、60和90mm/h),及同时外加模拟相对于降雨量的0、2、4和10倍径流量,研究土壤溶质迁移到地表径流过程中扩散过程的规律。试验结果表明降雨强度、或地表径流总量、或地表水位线的增加,均加速土壤溶质的扩散过程。渗流作用下,对流-扩散作用存在着一种交互作用,能加速分子扩散过程。土壤溶质迁移过程同降雨强度、地表径流量和地下水位高低有着重要关系。
Through the raindrops to accelerate the soil surface solute migration to surface runoff process. The three rainfall conditions (30, 60 and 90 mm / h) were simulated by designing three kinds of hydrological conditions, that is, controlling drainage status (-5cm), soil water saturation and soil seepage status (5cm) 0, 2, 4 and 10 times of runoff of rainfall to study the law of diffusion of soil solute into surface runoff. Test results show that rainfall intensity, or total surface runoff, or surface water level increases, accelerate the process of soil solute diffusion. Under seepage, there is an interaction between convection and diffusion, which accelerates molecular diffusion. Soil solute transport process is closely related to rainfall intensity, surface runoff and groundwater level.