Horizontal Diffusion Characteristics and Simulation of Poor Soil in Grassland Open-pit Area

CHEN Gong; LIU Hu; WEI Zhanmin

doi:10.13870/j.cnki.stbcxb.2023.02.010

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Horizontal Diffusion Characteristics and Simulation of Poor Soil in Grassland Open-pit Area

更新时间：2025-03-12

- Horizontal Diffusion Characteristics and Simulation of Poor Soil in Grassland Open-pit Area
- Vol. 37, Issue 2, Pages: 76-82(2023)
- 作者机构：
  
  1. 内蒙古农业大学水利与土木建筑工程学院,呼和浩特,010018
  2. 水利部牧区水利科学研究所,呼和浩特,010020
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2023.02.010
  CLC： S152.7
- Published：2023
- 稿件说明：
移动端阅览
CHEN Gong, LIU Hu, WEI Zhanmin. Horizontal Diffusion Characteristics and Simulation of Poor Soil in Grassland Open-pit Area[J]. 2023, 37(2): 76-82.
DOI：

CHEN Gong, LIU Hu, WEI Zhanmin. Horizontal Diffusion Characteristics and Simulation of Poor Soil in Grassland Open-pit Area[J]. 2023, 37(2): 76-82. DOI： 10.13870/j.cnki.stbcxb.2023.02.010.

摘要

为探究草原露天矿区不同类型土壤的水平扩散特征

以内蒙古鄂尔多斯市伊旗武家塔矿区的原状土、矿山堆积土和生态改造土3种不同立地类型的土壤为对象

通过土壤质地、扩散率、含水率等测试试验

采用HYDRUS-1D软件

对原状土、矿山堆积土和生态改造土入渗特性进行数值模拟

分析各因素对矿区土壤入渗规律的影响

探讨草原露天矿区不同类型土壤水平扩散过程的影响及变化规律。结果表明

在一维水平入渗运动条件下

原状土、堆积土、生态改造土3种不同粒径土壤的湿润锋运移距离与时间曲线整体呈现相似变化

随着入渗时间的增加

湿润锋运移距离呈现先快速增加

后缓慢推进趋势。同一种土壤类型条件下

土壤的湿润锋到达土柱最末端所需时间与土层深度呈反比关系

随着土层深度的增加

所需时间逐渐减少

且平均扩散速率更快;在同一入渗时间下

湿润锋运移距离与土层深度呈正比关系

随着土层深度增加

湿润锋运移距离也相应增大。Boltzmann参数(λ)随着土壤含水率的增加而逐渐减小

各土壤的λ~θ关系曲线随土壤含水率的增加呈现下降趋势。当θ达到某一临界值之后

λ急剧减少

原状土、堆积土和改造土各土层θ临界值略有差异

原状土各土层的θ临界值为0.29

堆积土各土层分别为0.24

0.28

0.30

而生态改造土除60—90 cm外

其余土层的θ临界值为0.31。通过HYDRUS-1D模型结合水平土柱剖面含水量变化对土壤水力参数进行反演

模拟3种土壤面含水量的变化

R2均大于0.91

纳什效率系数(NSE)均大于0.95

均方根误差(RMSE)均小于0.20。利用HYDRUS-1D模型反演土壤水力参数模拟矿区劣质土壤水平入渗过程

能较好地模拟入渗过程

描述矿区不同土地类型的土壤水分动态变化规律

为矿区的土壤水分动态监管及生态治理提供参考依据。

Abstract

In order to explore the horizontal diffusion characteristics of different soil types of in the grassland open-pit mining area

three different soil types including undisturbed soil

mine accumulation soil and ecological transformation soil in Wujiata mining area of Yiqi

Ordos City and Inner Mongolia were taken as the objects.The soil texture

diffusion rate and water content were measured

and the infiltration characteristics of undisturbed soil

mine accumulation soil and ecological transformation soil were numerically simulated by HYDRUS-1D software

so as to analyze the influence of various factors on the soil infiltration law in mining area

and to explore the influence and variation law of horizontal diffusion process of different types of soil in grassland open-pit mine area.The results show that under the condition of one-dimensional horizontal infiltration movement

the wetting front migration distance and time curve of three different particle sizes of undisturbed soil

accumulated soil and ecologically modified soil show similar changes as a whole:with the increase of infiltration time

the wetting front migration distance increases rapidly at first and then slowly advances.Under the same soil type

the time required for the wetting front to reach the end of the soil column is inversely proportional to the soil depth:with the increase of soil depth

the time required decreases gradually

and the average diffusion rate is faster;under the same infiltration time

the wetting front migration distance is proportional to the soil depth:with the increase of soil depth

the wetting front migration distance also increases accordingly.The Boltzmann parameter λ decreased with the increase of soil moisture content

and the λ~θ relationship curve of each soil showed a decreasing trend with the increase of soil moisture content.When θ reaches a certain critical value

λ decreases sharply

and the critical values of θ in each soil layer of undisturbed soil

accumulation soil and modified soil are slightly different.The critical values of θ in each soil layer of undisturbed soil are 0.29

and those in each soil layer of accumulation soil are 0.24

0.28

0.30

respectively.However

the θ critical value in the ecological transformation soil except 60—90 cm is 0.31.The soil hydraulic parameters were inverted by HYDRUS-1D model combined with the change of water content in horizontal soil column profile.The changes of water content in three kinds of soil surface were simulated.The R2 was greater than 0.91

The NSE was greater than 0.95

and the RMSE was less than 0.20.Using HYDRUS-1D model to invert soil hydraulic parameters to simulate the horizontal infiltration process of poor quality soil in mining area can better simulate the infiltration process

describe the dynamic changes of soil moisture in different land types in mining area

and provide reference for dynamic supervision and ecological management of soil moisture in mining area.

关键词

Keywords

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