干旱区研究

干旱区研究

• 中国山地生物多样性 •    下一篇

甘肃黑方台黄土水分运移规律模拟

石兰君1，乔晓英1,2，曾磊1,2,3，赵贵章4   

  1. 1.长安大学环境科学与工程学院，陕西 西安 710054；2.干旱区地下水文与生态效应教育部重点实验室，陕西 西安 710054；3.西安地质调查中心，陕西 西安，710054；4华北水利水电大学，河南 郑州，450045
  • 发布日期:2019-01-01
  • 基金资助:
    国家自然科学基金面上项目(41472222)；陕西省矿产资源勘查与综合利用重点实验室开放基金项目（2014HB1007)

Simulation of Loess Soil Water Migration in Xertain Northwest

SHI Lan-jun1，QIAO Xiao-ying1,2，ZENG Lei1,2,3，ZAO Gui-zhang4   

  • Published:2019-01-01

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摘要： 本文以室外试验为基础，应用饱和-非饱和土壤水分运移理论，利用Hydrus软件对甘肃黑方台包气带水分运移规律进行数值模拟，分析土壤剖面不同深度处含水量变化规律，将模拟结果与实测结果进行对比分析，并且将拟合参数应用到两种不同的介质中。结果表明，(1）水率呈峰谷波动变化；（2）均质黄土层和上覆5 cm厚的粉质壤土的黄土层中，土壤水分入渗率和潜水蒸发率均随潜水埋深的增加而减少，在潜水埋深300 cm以下时，两种介质的土壤水分入渗率趋于同一值，含粉质壤土的潜水蒸发率小于均质黄土的潜水蒸发率。综上可知，该含水量的变化具有时空特征，土壤水分入渗率、潜水蒸发率随着潜水埋深变化规律整体相似，对研究滑坡水分分布提供科学依据。

关键词: 黄土, 包气带, 水分运移, 数值模拟, 运移规律

Abstract: According to analyze the saturated-unsaturated soil hydraulic parameters, vadose water migration mechanism is numerically simulated in the research by using Hydrus-1D software, which was based on the outdoor test and saturated - unsaturated soil moisture migration theoretical basis . The model has been verified using the field experiments, and the fitting parameters are applied to two soils, homogeneous soil lager and overlying 5 cm thick silty loam soil lager. The results showed that 1) the moisture content was fluctuating in peak valley. 2) Soil water infiltration rate and the phreatic water evaporation rate decreases with an increasing of the phreatic water level in two soils; two kinds of soil water infiltration rate tend to be the same value when the phreatic water level was less than 300 cm, medium containing silty loam of the evaporation rate is less than the phreatic water evaporation rate of homogeneous loess. In conclusion, the change of water content has spatial and temporal characteristics. The rate of two soils water infiltration and the phreatic water evaporation are similar with the change of phreatic water level. It provides scientific basis for the water distribution and change of the landslide.

Key words: Loess, The vadose zone, Water migration, Numerical Simulation, Water migration mechanism