摘要
本研究为根据盘式负压入渗仪测定的入渗数据计算土壤水动力参数的一种新方法。该方法是在已有方法结构不变的情况下,引入重力对入渗的影响,发展得到的新模型。为了检验新方法,分别用各种不同模型计算用数值模拟及田间试验得到的不同土壤、盘径、水头压力条件下的入渗数据并进行比较。结果表明,相对于其他方法,新方法不仅对小盘径盘式负压入渗仪得到的入渗数据适用,更适用于大盘径盘式负压入渗仪得到的入渗数据,计算的导水率能在短时间内趋于常量,且计算结果比其他方法精度更高,是一种合理可靠的计算方法。
The disc infiltrometer has been used as a field device for in-situ measurement of unsaturated infiltration under tension. In this paper an improved method for calculating the soil water dynamic parameters according to the data measured by small disc is proposed. The influence of gravity on infiltration is taken into account. The validity of this method is verified by numerical simulation results and field test data. The comparison shows that the proposed method provides more accurate and stable estimation of calculated hydraulic conductivity and macroscopic capillary length for both small and large disc infihrometer.
出处
《水利学报》
EI
CSCD
北大核心
2005年第8期1007-1013,共7页
Journal of Hydraulic Engineering
基金
国家自然科学基金资助项目(50279038)
科技部国际合作重点项目(2003DF020008)
关键词
盘式负压入渗仪
导水率
宏观毛管上升高度
disc infihrometer
macroscopic capillary length
hydraulic conductivity
estimation
improved method
