Moisture Migration of Vegetation Concrete Under Buried Drip Irrigation in Soil

WANG Chenyuan; ZHOU Mingtao; HU Xudong; ZHANG Han

doi:10.13870/j.cnki.stbcxb.2022.02.023

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Moisture Migration of Vegetation Concrete Under Buried Drip Irrigation in Soil

更新时间：2024-11-07

- Moisture Migration of Vegetation Concrete Under Buried Drip Irrigation in Soil
- Vol. 36, Issue 2, Pages: 173-180(2022)
- 作者机构：
  
  1. 三峡大学土木与建筑学院,湖北,宜昌,443002
  2. 三峡库区地质灾害教育部重点实验室(三峡大学),湖北,宜昌,443002
  3. 三峡库区生态环境教育部工程研究中心,湖北,宜昌,443002
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.02.023
  CLC： S152.7
- Published：2022
- 稿件说明：
移动端阅览
WANG Chenyuan, ZHOU Mingtao, HU Xudong, et al. Moisture Migration of Vegetation Concrete Under Buried Drip Irrigation in Soil[J]. 2022, 36(2): 173-180.
DOI：

WANG Chenyuan, ZHOU Mingtao, HU Xudong, et al. Moisture Migration of Vegetation Concrete Under Buried Drip Irrigation in Soil[J]. 2022, 36(2): 173-180. DOI： 10.13870/j.cnki.stbcxb.2022.02.023.

摘要

以复合人造土壤为研究对象

研究滴头流量、坡度因子对植被混凝土水分运移过程的影响效应

揭示壤中滴灌条件下植被混凝土湿润锋运移动态变化及含水率时空分布特征

探讨植被混凝土与天然土壤在水分运移方面的异同

为高陡边坡生态恢复下壤中滴灌系统的灌溉布局与灌溉制度提供理论参考。结果表明:滴头流量、坡度对垂直向上方向的水分运移影响最大

对水平方向的影响较小。灌水前期

土壤基质吸力的影响远大于重力

水分在垂直方向上的运移距离与水平方向相近;灌水中期

垂直向上与水平方向的渗透速率随坡度增大而变缓;灌水后期

垂直向下的渗透速率逐渐趋于由重力为主要诱使因素的稳定速率;相同灌水量下

流量越小

湿润锋运移距离越远;水分再分布时段

受重力梯度和基质势的综合影响

垂直向下的运移距离最远

水平方向次之

垂直向上最近;含水率等值线呈椭圆形分布

且垂直向下的含水率均大于垂直向上和水平方向的含水率。采用幂函数与二次函数均可拟合植被混凝土湿润锋运移距离与入渗时间的关系

其中幂函数拟合程度更佳(R2>0.95)

但R2略小于一般天然土壤

拟合结果扩大了土壤水动力学理论在复合土壤的适用范围。

Abstract

The purpose of this study was to explore the influence of dripper discharge and slope factors on vegetation-concrete moisture migration by using composite artificial soil. The dynamics of wetting front of vegetation concrete and spatial-temporal distribution of soil moisture under buried drip irrigation in soil were studied

and the similarities and differences of moisture transfer between vegetation concrete and natural soil were discussed as well

which could provide theoretical reference for irrigation scheduling of drip irrigation during ecological restoration of high-steep slope. The results showed that dripper discharge rate and slope had the greatest influence on vertically upward moisture migration

but had little impact in horizontal direction. At the earlier stage of irrigation

the influence of soil matrix suction was much greater than that of gravity

and the vertically upward distance of moisture migration was similar to the horizontal distance. During the middle period

the infiltration rate in vertically upward and horizontal directions decreased with the increases of slopes. At the later stage

the vertically downward migration rate gradually tended to be stable

which was mainly induced by gravity. At the same irrigation volume

the smaller the flow rate

the farther the wetting front would migrate. During the period of moisture redistribution

the distance of vertically downward migration was the farthest

followed by horizontal direction

and vertically upward distance was the nearest. The contours of moisture content were oval

and vertically downward moisture content were larger than those in vertically upward and horizontal direction. Both power and quadratic functions could fit the relationship between the distance of wetting front migration and infiltration time

of which power function was better(R2>0.95)

but R2 was slightly smaller than that of natural soil

which expanded the application scope of Soil Hydrodynamics in the composite soil.

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