基于两组负水头入渗数据推求Brooks-Corey模型中的参数  

Estimating Brooks-Corey model parameters based on soil water infiltration data under two kinds of negative water pressures

作　　者：邹朝望[1] 薛绪掌[2] 张仁铎[3] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072 [2]国家农业信息化工程技术研究中心,北京10089 [3]中山大学环境科学与工程学院,广州510275

出　　处：《农业工程学报》2006年第8期1-6,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(50479064;50279038);北京市科技新星计划资助项目(H020821340130)

摘　　要：非饱和土壤水分运动和溶质运移的研究需要准确的土壤水动力特性信息,然而土壤水动力特性的测定往往费时费力且较难。该研究假设土壤水力动力特性可用B rooks-Corey模型来描述,结合D arcy定理和质量守恒推导了基于两组负水头下入渗数据来估计B rooks-Corey模型参数的方法。利用负水头下一维土壤水分运动中累计入渗量和湿润峰之间的关系实现了参数的求解,大量的数值模拟数据检验了该方法,并与W ang的方法进行了比较和分析,结果表明本研究提供了一种简单而且精确的确定土壤水动力参数方法。Accurate information of soil hydraulic properties is important for unsaturated soil water movement and solute transport, but measurement of these properties is usually time-consuming, expensive and difficult. Taking an assumption that soil hydraulic properties could be described by Brooks-Corey model, the Brooks-Corey model parameters based on soil water infiltration data under two different negative water pressures by combining the Darcy theorem with mass conservation were discussed. When the relationships between cumulative infiltration capacity and wetting front are determined during soil water infiltration, the parameters of Books-Corey model can be estimated. The analytical method was evaluated with numerical simulations of water flow and compared with the method by Wang. The new method is simple and provides a good precision for estimation Brooks-Corey model parameters.

关 键 词：土壤水力特性 质量守恒 负水头 

分 类 号：S152.7[农业科学—土壤学]