风积砂非饱和水力参数研究  

The Unsaturated Hydraulic Parameters for Aeolian Sand

作　　者：程东会[1] 王文科[1] 李威 王会[1] 

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054 [2]青海省水文地质工程地质环境地质调查院,青海西宁810008

出　　处：《安徽农业科学》2010年第10期4970-4971,5001,共3页Journal of Anhui Agricultural Sciences

基　　金：教育部科学技术研究重大项目(308021);教育部长江学者创新团队(IRT0811);中国地质调查局地质调查项目(1212010331302)

摘　　要：利用负水柱方法测定了风积砂脱湿和吸湿2个过程的水分特征曲线,用Van Genuchten公式求出拟合参数值,得到非饱和渗透系数、比水容量等表征风积砂非饱和性质的参数。结果表明,风积砂吸湿水分特征曲线比脱湿过程存在较大的滞后性;比水容量最大值相差不大,但出现最大值时脱湿过程为30cmH2O,而吸湿过程为10cmH2O;脱湿的非饱和渗透系数远远大于吸湿过程,当吸力为70cmH2O时,渗透系数最大相差近4个数量级。The water characteristic curve for aeolian sand in two processes of wetting and drying was obtained by the negative water column technique.The values of fitting parameters were calculated according to Van Genuchten formula and the parameters that characterized the prosperities of aeolian sand such as the unsaturated infiltration coefficient and specific water capacity were obtained.The results showed that the water characteristic curve for aeolian sand in wetting process had greater hysteresis quality than that in drying process.The maximum of specific water capacity between two processes was similar,but the maximum occured at different suction,at 30 cm H2O in drying and at 10 cm H2O in wetting.The unsaturated infiltration coefficient of drying process was far more than that in wetting process.When the suction was at 70 cm H2O,the difference of the infiltration coefficient between the drying process and wetting process was up to four orders of magnitude.

关 键 词：负水柱法 土壤水特征曲线 脱湿和吸湿 非饱和渗透系数 比水容量 风积砂 

分 类 号：S152.7[农业科学—土壤学]