干旱区地理2017，Vol.40Issue(4)：729-736,8.
采用一维水平入渗试验测定古尔班通古特沙漠南缘丘间地风沙土渗透系数
One-dimensional horizontal infiltration test for determining permeability coefficient of aeolian sandy soil in interdune at the southern edge of Gurbantünggüt Desert
摘要
Abstract
Soil permeability,the movement of water into the soil profile,is a key process in the water cycle.Soil permeability coefficient is an important parameter for soil permeability.In order to clarify the acceptability of the one-dimensional horizontal infiltration method (one-D method) for simultaneously determining both the saturated and unsaturated permeability coefficients of aeolian sandy soil in interdune at the southern edge of Gurbantunggut Desert,Xinjiang,China,we carried out indoor soil one-dimensional horizontal infiltration test.The cumulative infiltration (I) and wetting front length (Xf) were measured under different infiltration pressures (0 cm,5 cm,10 cm,20 cm,30 cm,40 cm,50 cm,60 cm).The relationships between I and Xf,1 and the square root of time (t0.5) were also analyzed.The saturated permeability coefficient (Ks) obtained by one-D method and Gardner model was compared with the result obtained by using the TST-55 infiltrometer at fixed head.The results show that there was a significant linear relationship between I and Xf,and it was more reasonable to assume that the average soil moisture content after infiltration was equal to the average increment of moisture content in wet zone than that of Green-Ampt model.There was also a significant linear relationship between I and t0.5,and the Philip equation could well reflect the characteristics of horizontal infiltration under different infiltration heads.The values of Ks were 1 424.16 mm· d-1 and 1 156.10 mm· d-1,determined by using the one-D method and using the TST-55 infiltrometer method under the constant head,respectively.The similar result suggested that it was reliable to obtain the saturated permeability coefficient of aeolian sand soil in interdune using the one-D method.In addition,the value of pore size distribution parameter (a) determined using the one-D method was about 5.71 m-1 for aeolian sand soil in interdune.According to the Ks and a through the Gardner model,the unsaturated permeability coefficient (K(Ψ)) could be subsequently calculated.Compared with the widely-used instantaneous profile method,it was relatively easier and less time-consuming for determining the K (Ψ) of field soil by the one-D method.In conclusion,the one-dimensional horizontal infiltration test for determining permeability coefficient of aeolian sandy soil in interdune at the southern edge of Gurbantunggut Desert is feasible,which can provide both parameters for the hydraulics research and theoretical references for selecting methods on the soil hydrodynamic study in arid land.关键词
水平入渗/渗透系数/累计入渗量/湿润锋/古尔班通古特沙漠Key words
one-dimensional horizontal infiltration/permeability coefficient/cumulative infiltration/wetting front/Gurbantunggut Desert分类
农业科技引用本文复制引用
董义阳,胡顺军,赵成义,朱海,王丹丹,丁之勇..采用一维水平入渗试验测定古尔班通古特沙漠南缘丘间地风沙土渗透系数[J].干旱区地理,2017,40(4):729-736,8.基金项目
国家基础研究发展计划项目(2013CB429905) （2013CB429905）
国家自然科学基金项目(41671032,U1303181,41371011,41601107) （41671032,U1303181,41371011,41601107）
