摘要
在水平入渗方法的基础上,提出了一种不需测定饱和导水率,仅利用一维垂直入渗试验即可确定Brooks-Co-rey模型参数的新方法。利用封丘县两种质地土壤的入渗资料,对所提出的方法进行了检验。结果表明,只要入渗历时足够长,基质势和重力势作用相当,垂直入渗方法确定的土壤水力参数与水平吸渗方法的预测结果相近;利用预测的参数,数值解和提出的近似解均能很好模拟土壤水分入渗过程。相对于水平吸渗方法和反推参数法,垂直入渗方法省时省力,且能避免数值弥散和参数不唯一问题。
A new method is proposed for estimating soil hydraulic parameters in the Brooks-Corey model.The method uses only one-dimensional vertical infiltration experiments,thus,measurement of saturated hydraulic conductivity is not required.The method is tested in two soil textures in Fengqiu County.The result shows that the Brooks-Corey soil parameters estimated by the new method are quite comparable to those of using the horizontal absorption method when the gravitational potential is balanced by the matric potential（capillary potential） and the soil stays wet long enough.Using the estimated parameters,the infiltration process simulated by the Brooks-Corey model is in good agreement with the observation.The new method saves time and effort,and can help to avoid the numerical dispersion problems as well as multiple solutions compared to other methods such as the horizontal absorption method and the inverse parameter method.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2011年第2期235-241,共7页
Advances in Water Science
基金
国家自然科学基金资助项目(50909090)
中国科学院知识创新工程重要方向资助项目(KZCX2-YW-406)
国家重点基础研究发展计划(973)资助项目(2005CB121103)
黄土高原土壤侵蚀与旱地农业国家重点实验室基金资助项目(10501-238)~~
