紫色土典型三角形均质剖面入渗模拟研究

doi:10.3969/j.issn.1001-5485.2015.03.010

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长江科学院院报 ›› 2015, Vol. 32 ›› Issue (3) : 44-49. DOI: 10.3969/j.issn.1001-5485.2015.03.010

土壤侵蚀机理

紫色土典型三角形均质剖面入渗模拟研究

程冬兵¹,郑艳霞²,钱峰¹,孙蓓¹

作者信息 +

Modelling the Water Infiltration in Typical Triangular Profile of Homogeneous Purple Soil

CHENG Dong-bing¹,ZHENG Yan-xia²,QIAN Feng¹,SUN Bei¹

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文章历史 +

摘要

通过室内特制的土壤水分入渗试验装置,分别设置正、倒直角三角形单一质地土壤剖面,探讨紫色土的不规则剖面均质土壤入渗特性。参考Green-Ampt模式思路,建立了紫色土典型三角形均质剖面入渗模型。试验结果显示:粗质地的湿润锋随时间推进速度快于细质地;同一质地,正直角三角形剖面铅直面湿润锋随时间推进速度快于倒直角三角形剖面,但入渗速率小于倒直角三角形剖面;入渗前期,正三角形剖面的斜面湿润锋随时间推进速度快于倒直角三角形剖面,随入渗继续,反而逐渐慢于倒直角三角形剖面。各剖面入渗的湿润锋、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均质剖面入渗模型经实测值验证,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

The features of water infiltration in irregular profile of homogeneous purple soil was investigated by establishing an infiltration model of purple soil with reference to Green-Ampt theory. Profiles of right triangle and inverted right triangle of homogeneous purple soil are set through specialized soil infiltration test device indoor.Results reveal that the wetting front rate of coarse soil is faster than that of fine soil. For the same soil texture, the vertical wetting front rate in triangular profile is faster than that in inverted triangular profile, but the infiltration rate is smaller than that of inverted triangular profile. In the early stage of infiltration, the inclined wetting front rate in triangular profile is faster than in inverted triangular profile, and then gradually gets slower than inverted triangular profile. The wetting front, infiltration rate display obvious power function relationship with time. The established infiltration model was verified to be consistent with measured data. Meanwhile, it can be transformed with the existing empirical models, and the parameters are of physical meanings.

导出引用

程冬兵,郑艳霞,孙蓓. 紫色土典型三角形均质剖面入渗模拟研究[J]. 长江科学院院报. 2015, 32(3): 44-49 https://doi.org/10.3969/j.issn.1001-5485.2015.03.010

CHENG Dong-bing,ZHENG Yan-xia,QIAN Feng,SUN Bei. Modelling the Water Infiltration in Typical Triangular Profile of Homogeneous Purple Soil[J]. Journal of Changjiang River Scientific Research Institute. 2015, 32(3): 44-49 https://doi.org/10.3969/j.issn.1001-5485.2015.03.010

中图分类号： S152.7

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