Experimental Study on Vertical Unsaturated Infiltration in Soil Column Based on the Seasonal River Sand
Abstract: Based on the seasonal river sand, laboratory test was carried out by vertical unsaturated infiltration and it studied the main factors influencing the vertical infiltration. The results show that the unsaturated in-filtration can be divided into three stages changing with time. In the first stage, the infiltration rate drops rapidly. In the second stage, the infiltration rate declines slowly. And in the third stage, the infiltration rate is asymptotically stable. The initial moisture content of sample and sample texture obviously influ-ence on infiltration characteristics. Vertical infiltration velocity decreases with the increase of initial moisture content, as the sample decreases with the increase of dry density. When the initial moisture content was 1.02% and 5.11%, the stability infiltration rate of fine sand was about 0.027 mL/(s•cm2) and 0.021 mL/(s•cm2). When the initial water content rate was 1.38% and 3.51%, the stability infiltration rate of medium sand was about 0.028 mL/(s•cm2) and 0.026 mL/(s•cm2). The initial moisture content was about 1.83% and 5.92% when the stability infiltration rate of coarse sand was about 0.030 mL/ (s•cm2) and 0.029mL/(s•cm2). The stability infiltration rate of the coarse sand is greater than the fine sand. The test results provide a scientific basis for the further study of seasonal river seepage law.
文章引用: 李宁宁 , 武桂芝 , 冯增帅 , 杨 帆 (2016) 基于季节性河床砂样的垂向非饱和入渗试验研究。 水资源研究， 5， 16-22. doi: 10.12677/JWRR.2016.51002
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