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同时使用染色剂和碘离子作为示踪剂,染色剂用于示踪大孔隙通道,根据碘-淀粉显色反应确定实际流动模式。开展了6组试验,研究了土壤大孔隙特征和非均匀流动特性,比较了粉土和粘土2种土壤,入渗水量分别为20、40、60和80 mm以及不同流动边界条件下的土壤水和溶质再分布特性。实验资料显示,入渗水再分布主要受到湿润模式的影响。入渗水量较小的情况下,水流运动主要发生在大孔隙中,随着入渗水量增大,入渗模式与孔隙发育表现出显著的区别,随着入渗水量的增加,水流运动非均匀性表现出先增加,随后减小的趋势。溶质迁移非均匀性取决于水流非均匀流动特性,然而表现出更多的不确定性。
Dyeing agents and iodide ions are used simultaneously as tracers. Stains are used to trace the macroporous channels. The actual flow pattern is determined by the iodine-starch color reaction. Six experiments were carried out to study the characteristics of macropores and heterogeneous flow characteristics. Comparing the two kinds of soils, silt and clay, infiltration water volumes of 20, 40, 60 and 80 mm and soil water under different flow boundary conditions And solute redistribution properties. Experimental data show that infiltration water redistribution is mainly affected by the wet mode. Under the condition of small infiltration, the water flow mainly occurs in the macropores. With the increase of infiltration water, the infiltration model shows significant difference with the pore development. With the increase of infiltration water, the water flow motion is not uniform Sex showed an increase first, then a decreasing trend. The non-uniform solute transport depends on the non-uniform flow characteristics of the water flow, but shows more uncertainty.