| 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 |
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| 引用本文： | 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 |
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| 作者姓名： | 董义阳 胡顺军 赵成义 朱海 王丹丹 丁之勇 |
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| 作者单位： | 1. 中国科学院新疆生态与地理研究所, 荒漠与绿洲生态国家重点实验室, 新疆 乌鲁木齐 830011;2. 中国科学院大学, 北京 100049;3. 中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 江苏 南京 210008 |
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| 基金项目： | 国家基础研究发展计划项目（2013CB429905）；国家自然科学基金项目（41671032，U1303181，41371011，41601107） |
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| 摘 要： | 通过室内土壤水平一维入渗试验，测定了不同入渗水头作用下不同入渗时间对应的累计入渗量和湿润锋长度，分析了累计入渗量与湿润锋长度、累计入渗量与入渗时间平方根的关系，探讨了采用不同入渗水头作用下的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的适用性。研究结果表明：累计入渗量与湿润锋长度呈显著的线性关系；累计入渗量与入渗时间平方根呈显著的线性关系，Philip公式较好地反映了不同入渗水头作用下的水平入渗特点；采用水平土柱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是可行的。研究结果可为干旱区风沙土水力学研究提供参数，为推求风沙土水动力学参数的方法选择提供理论参考。
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| 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 |
| 收稿时间： | 2016-11-28 |
One-dimensional horizontal infiltration test for determining permeability coefficient of aeolian sandy soil in interdune at the southern edge of Gurbantünggüt Desert |
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| DONG Yi-yang,HU Shun-jun,ZHAO Chen-yi,ZHU Hai,WANG Dan-dan,DING Zhi-yong. One-dimensional horizontal infiltration test for determining permeability coefficient of aeolian sandy soil in interdune at the southern edge of Gurbantünggüt Desert[J]. Arid Land Geography, 2017, 40(4): 729-736 |
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| Authors: | DONG Yi-yang HU Shun-jun ZHAO Chen-yi ZHU Hai WANG Dan-dan DING Zhi-yong |
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| Affiliation: | 1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, Jiangsu, China |
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| 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,I 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(α)determined using the one-D method was about 5.71 m-1 for aeolian sand soil in interdune. According to theKS and α 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. |
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| Keywords: | one-dimensional horizontal infiltration permeability coefficient cumulative infiltration wetting front Gurbantunggut Desert |
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