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土壤中的优先流是指土壤在整个入流边界上接受补给,但水分和溶质绕过土壤基质,只通过少部分土壤体的快速运移.优先流的产生是由于土壤中往往存在大量的根孔、虫孔等大孔隙以及裂隙等.搞清优先流对土壤水分运动的影响,对于深入认识入渗补给过程、准确评价地下水补给资源以及地下水污染分析具有重要意义.本研究采用大分子染色材料(Brilliant Blue FCF)及根据碘与淀粉反应显现出蓝色的原理,设计实施了土壤中非均匀水流运动的室外染显色示踪实验,研究了土壤水非均匀流动模式,验证了优先流的水流通道网络特征.
Preferential flow in soil means that soil is recharged over the entire inflow boundary but moisture and solute bypass the soil matrix and only migrate rapidly through a small part of the soil mass.The preferential flow is caused by the large number of root pores , Macropores such as wormholes and fissures, etc. To understand the influence of priority flow on soil moisture movement is of great significance for understanding the process of infiltration and recharge, and accurately evaluating groundwater recharge resources and groundwater pollution analysis.In this study, macromolecular dye materials Brilliant Blue FCF) and based on the principle that iodine reacts with starch to show blue, we designed and implemented an outdoor dye colorimetric tracing experiment of nonuniform water flow in soil. The non-uniform flow pattern of soil water was studied and the flow of preferential flow was verified Channel network characteristics.