两种初始土壤含水量对浑水入渗影响的试验研究

Effects of Two Different Initial Soil Water Contents on Muddy Water Infiltration

浑水入渗是黄土高原地区普遍存在的现象,不同土壤初始含水量对入渗结果有着显著影响。以清水入渗为对照,研究了不同含水量条件下浑水入渗实验特征以及减渗率等内容。分析结果表明,第1 min末入渗速率?稳定入渗速率和累积入渗量均随浑水浓度增加呈指数函数关系递减,均表现出随着浓度增加呈稳定趋势。清水的累积入渗量在相同时段内始终最大,随着泥沙浓度增加,累积入渗量减小。本研究结果对土壤侵蚀机理研究具有应用价值。

Muddy water infiltration is a common phenomenon in the Loess Plateau.The difference between infiltration processes of muddy water at different initial soil water contents is significant.Taking clear water as the control,we investigated the infiltration characteristics and infiltration decline rates of muddy water at different initial soil water contents.The results showed that the initial（at the end of first minute） and final stable infiltration rates as well as the cumulative infiltration volumes decreased exponentially as the turbidity increased.Those relationships appeared less variable with an increase in turbidity.For the same time duration,the cumulative infiltration volumes were always the greatest with clear water,and increasingly smaller as suspended solid concentration increased.The results of this study may be helpful to study soil erosion mechanism.