Simulation of infiltration into typical triangular layered purple soils
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摘要: 通过室内特制的土壤水分入渗试验装置,分别设置上粗下细和上细下粗两种典型不同质地紫色土三角形层状剖面,探讨典型不规则层次结构的土壤入渗特性。结果显示,同一三角形层状剖面入渗,粗质土半剖面的垂直湿润锋随时间推进速度快于细质土。对于粗质土,上细下粗剖面设置下其半剖面的垂直湿润锋随时间推进速度快于上粗下细,但对于细质土,两种层状剖面设置下其垂直湿润锋随时间推进速度差异不明显。无论上粗下细,还是上细下粗,两种层状剖面对斜面湿润锋变化曲线影响不大。两种层状剖面入渗,湿润锋、入渗速率与时间均呈极显著幂函数关系。建立的紫色土典型三角形层状剖面入渗模型,经验证,模拟值与实测值具有非常好的一致性,且可与经验模型相互转换,模型参数也具有一定的物理意义。Abstract: Infiltration processes in typical triangular layeredpmple soils are first investigated using indoor mil infiltration devices.The devices are designed to have two distinct triangular layered soilprofiles, which are soarse-to-fine and fine-to-coarse in soil textures from surface to bottom.Experimental results show that the wetting front advance appears to be faster in the first half of the layered mil column compared to that of the second half in the coarse-to-fine soil infiltration device.The opposite result is obtainedwith the fine-to-coarse mil infiltration device.Observation from the fine-to-coarse mil infiltration device shows that the rate of advance of the wetting front increasesmore quicklywith tine in the second half of the layered soil column compared to thatof the first half in the coarse-to-fine mil infiltration device.However, there is no significant rate difference in the finer portions of layered mil columns on both devices.The inclined wetting front rate is found to be sinilaron both devices, which indicates that the mil texture has almost no influence on the rate.A mathematicmodel for simulating infiltration into triangular layered mils is developed using the power relationship and validated by the experimental data.The modeling result is in a good agreementwith the experinent The model has some physical meaning and can be transformed into the existing empirical models each other.
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Key words:
- soil mechanics /
- purple soil /
- triangular layered soils profile /
- soil infiltration
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