水利水电科技进展2011，Vol.31Issue(5)：35-38,45,5.DOI:10.3880/j.issn.1006-7647.2011.05.009
考虑大孔隙的土壤入渗模型
Infiltration model for soils considering macrospores
摘要
Abstract
In order to study the influences of macropores on infiltration and erosion of soils, a mathematical model consisting of two flow domains was established for the infiltration of soils, that is, the soil matrix with flows modeled by means of the Darcy equation and the macropores with flows modeled by use of a kinematic wave equation and the parameters related with the shape of the macropores. Hie water exchange between the macropore domain and the matrix domain was regarded as the sink term in the macropore mass conservation equation and as the source term in the matrix continuity equation. The infiltration through the macropore walls was modeled by means of the diffusion equation. The modeling of the infiltration results of this model was validated by use of the soil column experiments. The outflow rate from the bottom surface of the soil column was measured, and the water content of the soils was recorded at regular time intervals by means of TDR horizontal probes. The validated results show that the proposed model can adequately simulate the outflow hydrographs from the bottom outlet of the soil column as well as the temporal evolution of water content profile.关键词
大孔隙/基质/达西公式/运动波/土柱试验Key words
macropore/matrix/Darcy formula/kinematic wave/soil column experiment分类
建筑与水利引用本文复制引用
解河海,冯杰,冯青,曾碧球..考虑大孔隙的土壤入渗模型[J].水利水电科技进展,2011,31(5):35-38,45,5.基金项目
水利部社会公益性项目(200801033) （200801033）
中国水利水电科学研究院科研专项(资集1017) （资集1017）
国家自然科学基金(50609005) （50609005）
