CAJ | 학술논문

双环入渗仪在测定田间土壤饱和导水率时被广泛采用.本文采用不同直径的双环入渗仪(内环直径分别为20 cm、40 cm、80 cm和120 cm)和不同的内外环直径比,即不同的缓冲指标(0.2、0.33、0.5和0.71),进行了16组定水头积水入渗试验,研究了双环入渗仪缓冲指标对土壤饱和导水率测定的影响.结果表明:内环直径较小的入渗仪,其累积入渗过程曲线的分布较分散;随着入渗环直径逐渐增大,分散范围逐渐缩小.另外,随着缓冲指标的逐渐增大,测定的土壤饱和导水率并没有明显的增大或减小趋势,但内环直径20 cm的入渗仪测定的土壤饱和导水率的波动最大,而80 cm和120 cm内径的双环入渗仪测定的土壤饱和导水率最稳定,并且始终非常接近.因此,相对于双环入渗仪内环大小或土壤非均质性的影响,双环入渗仪的缓冲指标对于土壤饱和导水率测定的影响要小.
쌍배입삼의재측정전간토양포화도수솔시피엄범채용.본문채용불동직경적쌍배입삼의(내배직경분별위20 cm、40 cm、80 cm화120 cm)화불동적내외배직경비,즉불동적완충지표(0.2、0.33、0.5화0.71),진행료16조정수두적수입삼시험,연구료쌍배입삼의완충지표대토양포화도수솔측정적영향.결과표명:내배직경교소적입삼의,기루적입삼과정곡선적분포교분산;수착입삼배직경축점증대,분산범위축점축소.령외,수착완충지표적축점증대,측정적토양포화도수솔병몰유명현적증대혹감소추세,단내배직경20 cm적입삼의측정적토양포화도수솔적파동최대,이80 cm화120 cm내경적쌍배입삼의측정적토양포화도수솔최은정,병차시종비상접근.인차,상대우쌍배입삼의내배대소혹토양비균질성적영향,쌍배입삼의적완충지표대우토양포화도수솔측정적영향요소.
The double-ring infiltrometer is widely used to measure soil saturated hydraulic conductivity. To investigate effects of ratio of the outer to the inner rings, i.e. the buffer index of double-ring infiltrometer, on measurement of saturated hydraulic conductivity, 16 sets of field experiments were laid out and conducted using 16 double-ring infiltrometers with 4 inner-ring diameters (20 cm, 40 cm, 80 cm, and 120 cm) and 4 buffer indices (0.2, 0.33, 0.5 and 0.71). Results show that uncertainty of the measured saturated hydraulic conductivity decreased with increasing diameter of the inner-rings. Saturated hydraulic conductivities in the infiltrometers with an inner-ring diameter of 20cm varied in a broad range, while those in the infiltrometers with inner-ring diameters of 120cm and 80cm were always close to each other and less in variation. However, no rising or falling tendency was observed for the increasing buffer indices. It is concluded that the inner-ring diameter is a more important factor to be considered than the buffer index in practice, and a larger inner-ring diameter, such as 80cm, is proposed as a lower limit of the inner-ring size to obtain reliable in-situ measurement of hydraulic conductivity.