PAM对一维垂直入渗特征量影响的试验研究

The Experimental Study on the Influences of PAM on One-dimensional Vertical Infiltration

分析了聚丙烯酰胺(PAM)对一维垂直积水入渗的入渗率、累积入渗量以及湿润锋的影响,试验结果表明PAM对上述指标均有明显的抑制效应:PAM对入渗率的影响具有稳定性和一致性,表现为对应于同一时刻,PAM浓度越大入渗率越低;PAM导致累积入渗量减少的减渗率在入渗过程中为一常数,相对于对照处理(PAM浓度为0)的累积入渗量,10×10-6、50×10-6、500×10-6的PAM溶液的减渗率分别为98.51%、79.63%和60.48%;PAM导致湿润锋降低的减渗率在入渗过程中并非常数,随对照处理湿润锋的增加而增加,受到了入渗时间的影响,入渗过程中浓度为10×10-6、50×10-6、500×10-6的PAM减渗率极大值分别为67.11%、83.26%和97.13%。

The influences of PAM on infiltration rate, accumulative infiltration and wetting front were analyzed in this paper. The experiments showed that PAM has obvious influences on infiltration rate, accumulative infiltration and wetting from： the influences of PAM on infiltration rate were stable and corLsistent; the denser the PAM concentration, the lower the irrfiltration rate; the infiltration decay ratio （IDR） of accumula tlve infiltration due to PAM was a constant, and the IDR were 98. 51%, 79. 63% and 60. 48% for 500, 50 and 5 ppm PAM solution, respective ly, compared to 0 ppm solution; the IDR of wetting front due to PAM was not a corkstant, which was influenced by the depth of wetting front and time,and the max of IDR of wetting from were 67. 11%0.83. 26 and 97. 13% for 10, 50 and 500 ppm PAM solution, respectively.