Experimental Study on the Infiltration Laws of Water-Repellent Soils Based on Alcohol Solution

Comparative infiltration experimental study based on the 2 soils of different water-repellency degrees was conducted.Indoors soil column experiment were used to carry out the experiment of ponding infiltration to compare the variations of infiltration volumes and infiltration rates versus time of 2 soils in different water-repellency degrees,applicability of Kostiakov equation in water-repellent soils based on the alcohol infiltration was tested,the fitted relations of infiltration versus t-1/2 were explored,as well as distributions of total salt and Cl-contents in the profiles were researched.Results showed that the existence of soil water-repellency has some obvious impacts on the soil infiltration property,but variations of the infiltration capacity among water-repellent soils of different water-repellent degrees,and the infiltration capacity in water-repellent soils was lower than one in wettable soils;the rinsed results of total salt and Cl-were more obvious in water-repellent soils that those in wettable soils,and the maximum was reached at the wetting front;applicability of Kostiakov equation was well about the variations of the infiltration rates versus time;there was good exponential relationship between infiltration rates and t-1/2.The study showed that the existence of soil water-repellency affected alcohol solution infiltration,but water-repellent soil infiltrations of different water-repellent degrees were not influenced by alcohol solution.The process of infiltration based on alcohol solution was accelerated greatly compared to distilled water infiltration.