| Cite this article: | 黄汉生,杨何畏,王康.土壤水实验设备负压边界调控方法及其效果研究[J].灌溉排水学报,0,():-. |
| HUANG Hansheng,YANG Hewei,WANG Kang.土壤水实验设备负压边界调控方法及其效果研究[J].灌溉排水学报,0,():-. |
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| Adjusting soil potential at the boundary of the lysimeters using the negative pressure controlling device |
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HUANG Hansheng1,2, YANG Hewei2, WANG Kang1
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1.State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University;2.Hubei Water Conservancy and Hydropower Research Institute
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| Abstract: |
| The realization of controlling the negative pressure at the boundaries will significantly improve the simulation functions of the large-scale lysimeters and other soil moisture and solute migration simulation equipments. A negative pressure boundary controlling device was developed and the performances of the device (i.e., the uniformity and stability of soil negative pressure) were evaluated under the conditions that the negative pressures in the vacuum chamber were -15, -30 and -50kPa, respectively. The results showed that under the experimental conditions, the negative pressure transfer in the vacuum chamber-ceramic membrane-soil can maintain soil pressure in the sit value. Compared with the negative pressure in the vacuum chamber, the negative pressure at the regiment boundary reduced 20% due to the influences of soil texture and conductivity of membrane. The uniformity of the soil potential at the boundary was mainly affected by the transmission of negative pressure in the soil, the equilibrium rate of soil matrix potential and the hydraulic properties of the ceramic membrane. The stability of negative pressure control is mainly affected by the properties of soil medium. The uniformity of the device reached 0.7 and the systematic deviation was less than 6.8%, indicating that the device can be used to regulate and control the negative pressure in soil at the boundary layers. |
| Key words: Negative;potential boundary;controlling equipment, Soil;potential, Stability;and uniformity, lysimeter. |
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