应用亮兰染色剂指示溶质迁移边界层的研究

应用边界层方法确定溶质迁移参数是一种简单可靠的方法,但如何确定边界层的位置是限制边界层方法应用的关键因素。而亮兰染色剂在土壤中迁移时,具有边界层清晰、容易确定的特点。基于此,以Cl-为例,研究了该染色剂指示非反应性溶质迁移边界层的可行性。研究结果表明:在同一土柱中,亮兰染色剂的边界层与Cl-的边界层的运动规律相似,亮兰染色剂和Cl-的边界层随时间的变化在弥散度很小的情况下都可以用线性关系式近似描述。根据这一规律,得出在风沙土和黄绵土中Cl-边界层与亮兰染色剂边界层之间的关系表达式。两者边界层之间转换关系的求得,为应用亮兰染色剂准确指示非反应性溶质迁移边界层成为可能提供了一条思路。

Primary study on application of brilliant blue dye to indicating the boundary layer of solute transport

Estimating solute transport parameters with boundary layer method is a reliable and simple method, but how to determine the position of the boundary layer is the key factor to limit its the application. Because the boundary layer of the brilliant blue dye in soil is very clear and easy to be determined, the feasibility of indicating the boundary layer of Cl~- using the brilliant blue dye is studied in this paper. The results show that the transport law of the brilliant blue dye is similar to that of the Cl~-. The relationship between the boundary layers of the Cl~- and the brilliant blue dye can be described by the linear equation under the condition of the relatively small value of dispersivity. Furthermore, the relationship between the boundary layers of the Cl~- and the brilliant blue in sand soil and light loam soil could be derived, which will provide an idea to use the brilliant blue dye to indicate the boundary layers of the non-reactive solutes.