不同浓度浑水入渗试验研究

黄土高原地区暴雨径流形成高含沙浑水,其人渗特点直接影响着坡面产流产沙,探求不同浓度浑水入渗规律,对于坡面土壤侵蚀机理研究具有指导意义.以清水入渗为对照,试验测定了不同浓度浑水入渗特征、入渗过程和浑水减渗率等项目.分析结果表明,第1 min末的入渗速率、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,而减渗率随浑水浓度增加呈对数函数关系递增.两种关系均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,说明浑水具有阻渗作用.

Experimental Studies on Muddy Water Infiltration with Different Concentrations

Muddy water with high concentration often occurs in rainstorms on the Loess Plateau,which directly influences runoff and sediment yield on slope. Know ledge of muddy water infiltration with different concentrations is important to the study of soil erosion on slope. By taking clean water as control, infiltration characteristics,infiltration processes,and infiltration decay ratio of muddy water with different concentrations were measured. Results showed that the infiltration rate at the end of first second, the stable infiltration rate,and the cumulative infiltration amount decreased exponentially with mud concentration, while the infiltration decay ratio increased logarithmically with mud concentration. The two relationships appeared steady as mud concentration increased. In the same time interval,the cumulative infiltration amount of clean water was always the highest,but decreased as mud concentration increased. Muddy water had a decreasing effect on infiltration.