水土保持学报2009，Vol.23Issue(5)：91-95,5.
不同大孔隙深度对土壤水分入渗特性的影响
The Effect of the Infiltration Characteristics Under the Different Macropores' Depth in the soil
摘要
Abstract
In this paper, it used the specific size and special sand mold simulate the same effective surface porosity, different depths of the large pore domain, water infiltration under the conditions of study in which three-dimensional moisture migration behavior. Experimental studies have shown that the existence of macropores resulting in water infiltration wetting front severe turbulence in the early infiltration, but it gradually over a smooth transition and its stability time relativity with the depth of macropores Z. The macropores domain filled with water rapidly and reach the large domain at the bottom of the macropore domain, causing the initial vertical and radial water infiltration, respectively. The cumulative amount of infiltration I increases with the depth of macropore . The characteristic of the deepest values of wetting front Z_(mf) was the wetting for the process of infiltration which was the center of the macropore domain. Laboratory analysis Z_(mf) and Z was around the same function but different coefficients in the point which the time before and after the turning point T_n. In the paper, it established the regression function model of the cumulative amount of infiltration 7, wetting front Z_(mf) and use the deviation function I_n carried out the accuracy test between the predictive value and the measured value, results shows that the precision of its requirements is good.关键词
优先流/大孔隙/大孔隙深度/水分运移/模拟实验Key words
preferential flow/macropores/the depth of macropore/water movement/simulation test分类
农业科技引用本文复制引用
吴继强,张建丰,高瑞..不同大孔隙深度对土壤水分入渗特性的影响[J].水土保持学报,2009,23(5):91-95,5.基金项目
国家自然科学基金(50779055) （50779055）
