摘要
根据土壤水动力学原理,提出了计算多层土壤稳定入渗率的饱和层最小通量法。采用HYDRUS-1D数值模拟软件,模拟了不同土壤表面水头、多层土壤特性下的稳渗过程,根据模拟结果对饱和层最小通量法进行了检验。结果表明,这种计算多层土壤稳渗率的方法物理意义明确、误差较小。与改进的Green-Ampt公式相比,该方法不需要考虑下层土壤的进水吸力,同时考虑了多层土壤对入渗的影响,更适用于实际情况下分层土壤稳定入渗率的估算,可以为水资源量评价、环境污染评价和相关工程设计等领域提供理论依据。
Based on the principle of soil water dynamics, a new method called the method of minimum flux in saturation layer （MFSL） for calculating the stable infiltration rate from multi-layer soil was proposed. The HYDRUS-1D was applied to simulate a series of infiltration processes with different surface water head, and under different hydraulic properties in the layered soil. The simulation results provide a standard to verify MFSL. The results show that MFSL tend to underestimate the stable infiltration rate, yet mostly less than 5%. Therefore MFSL is a method with clear physical background and less error. Compared with the modified Green-Ampt model for calculating infiltration through layered soil, MFSL does not need to consider the water entry suction in the lower soil layer, and can deal with the complexity of the multi-layer soil characteristics presented in reality. Therefore, MFSL is more suitable for the estimation of stable water infiltration rate in layered soil. It provides a convenient and useful tool for water resources evaluation, environment contamination evaluation, and the related projects design.
出处
《水利学报》
EI
CSCD
北大核心
2010年第7期810-817,共8页
Journal of Hydraulic Engineering
基金
国家科技支撑计划项目(2006BAD11B08-1)
国家自然科学基金项目(50979105)
教育部新世纪优秀人才支持计划项目(06-0059
07-0814)
长江学者和创新团队发展计划项目(IRT0657)
关键词
层状土
稳定人渗率
饱和-非饱和土壤水分运动
饱和层最小通量法
数值模拟
stratified soil
stable infiltration rate
saturated-unsaturated soil water flow
minimum flux in saturation layer
numerical simulation
