CAJ | 학술논문

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30 cmH2O,而吸湿过程为10 cmH2O;脱湿的非饱和渗透系数远远大于吸湿过程,当吸力为70 cmH2O时,渗透系数最大相差近4个数量级.
이용부수주방법측정료풍적사탈습화흡습2개과정적수분특정곡선,용Van Genuchten공식구출의합삼수치,득도비포화삼투계수、비수용량등표정풍적사비포화성질적삼수.결과표명,풍적사흡습수분특정곡선비탈습과정존재교대적체후성;비수용량최대치상차불대,단출현최대치시탈습과정위30 cmH2O,이흡습과정위10 cmH2O;탈습적비포화삼투계수원원대우흡습과정,당흡력위70 cmH2O시,삼투계수최대상차근4개수량급.
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 occurred 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.