【摘要】 在室内用水平土柱吸渗法对不同含盐量、不同溶液浓度和不同土类的土壤水扩散系数进行了试验研究.试验结果表明:土壤水(或盐水)扩散系数与土壤的体积含水量之间具有指数函数的关系,且随着含水量的降低而减小.当同一类土在干容重和含水量相同时,土壤水扩散系数是随土中含盐量的增多而增大,以粗粒土最为明显.不同浓度的盐水在土壤中运行时,其盐水的扩散系数是随盐水浓度的增大而减小.更多还原

【Abstract】 Hydraulic diffusivities of unsaturated soil with the different salt contents,saline concentrations and dry densities were experimental studied by means of wet front advancing in a horizontal soil column.It is found that: 1) The hydraulic diffusivity of soil water or saline is an exponential function of water content,and decreases with decreasing water content;2) For the same type of soil when dry density and water content are the same,the hydraulic diffusivity of soil water increases with salt content,especially,for the coarse-grained soil;3) When saline migrates in the soil,the hydraulic diffusivity of saline decreases with saline concentration.更多还原