充填层对覆土层水分变化影响的模拟研究

Simulation Study of Soil Water Dynamics in Overlying Soil with Filling Layers

水分变动状况是充填复垦土壤质量的重要指标。通过充填柱模拟实验研究了充填复垦中充填层物料孔隙度大小对覆土层含水量变化的影响。结果表明,充填层孔隙度略小于覆土层时,覆土层含水量减少最快,而充填层孔隙度大于覆土层时,覆土层含水量减少速度与充填层孔隙度成正相关。因此,在充填复垦实践时,应根据覆土层孔隙度情况设计充填层的孔隙以保证充填复垦土壤有较强的保水性能。

Soil water dynamics is one of the important indicators of reclaimed land quality. This paper is concerned about water dynamics in overlying soil with filling layers of different porosities by simulation experiment. Results indicate that water loss is faster when the filling layer porosity is slightly less than that of overlying soil. On the contrary, water loss is positively related to porosity when the filling layer porosity is greater than that of overlying soil. So, in order to keep more water in overlying soil in filling reclamation, filling layer porosity should be designed according to the porosity of overlying soil.