CAJ | 학술논문

预报土壤中水分流动需要的土壤导水特性可通过观测水平土柱的入渗过程来确定，这一观测过程的分析是基于对Richards方程求积分解。土壤水分特征曲线中的参数由观测的水平土柱的特征湿润长度和吸力来确定，非饱和土壤导水率由已确定的特征曲线中的参数和测定的饱和导水率导出。供试土壤有三种，它们的质地从砂壤到粘壤。由这种方法所确定的这三种土壤的水分特征曲线与实测的特征曲线符合良好，所确定的砂壤的非饱和导水率与实测值的比较令人满意。利用数值法和积分法分别计算了土壤含水量剖面，计算结果吻合良好，说明了这种方法的合理性。
예보토양중수분류동수요적토양도수특성가통과관측수평토주적입삼과정래학정，저일관측과정적분석시기우대Richards방정구적분해。토양수분특정곡선중적삼수유관측적수평토주적특정습윤장도화흡력래학정，비포화토양도수솔유이학정적특정곡선중적삼수화측정적포화도수솔도출。공시토양유삼충，타문적질지종사양도점양。유저충방법소학정적저삼충토양적수분특정곡선여실측적특정곡선부합량호，소학정적사양적비포화도수솔여실측치적비교령인만의。이용수치법화적분법분별계산료토양함수량부면，계산결과문합량호，설명료저충방법적합이성。
To predict water flow, knowledge of soil hydraulic properties is required. Horizontal infiltration of water into soil columns can be observed in order to determine hydraulic properties. Required physical and mathematical analysis of the observation is based on an integral solution of Richards′equation. The parameters of the soil water characteristic curve are estimated by the observed characteristic length of wetted zone and sorptivity. Unsaturated hydraulic conductivity is estimated from the parameters determined in the soil water characteristic curve and the measurement of saturated hydraulic conductivity. Three soils ranging from sandy loam to clay loam are included in this research. Soil water charactehstic curves for the three soils estimaed by the infiltration method are in good agreement with measured soil water characteristic curves. Unsaturated hydraulic conductivity, estimated by the infiltration method for the sandy loam, also compares well with measured values. To further check the method, water content of the three soils are calculated through the numeric method and the integral method based on the calculated hydraulic parameters. The calculation results indicate that the method is accurate.