HU Junhong, ZHAO Wenju, LIU Guiyuan, et al. Numerical Simulation of the Influence of Water and Soil Temperature on Water and Heat Transfer of Sand Mulching Soil Under Drip Irrigation[J]. 2020, 34(5): 349-354.
DOI:
HU Junhong, ZHAO Wenju, LIU Guiyuan, et al. Numerical Simulation of the Influence of Water and Soil Temperature on Water and Heat Transfer of Sand Mulching Soil Under Drip Irrigation[J]. 2020, 34(5): 349-354. DOI: 10.13870/j.cnki.stbcxb.2020.05.048.
Numerical Simulation of the Influence of Water and Soil Temperature on Water and Heat Transfer of Sand Mulching Soil Under Drip Irrigation
In order to explore the influence of water temperature and soil temperature on the water and heat transfer of sand mulched soil under the condition of drip irrigation
a numerical model of water and heat transfer of soil with different water and soil temperature was built based on HYDRUS-2D
and the influence of different water and soil temperature on the dynamic change of water and temperature of sand mulched soil was simulated and analyzed. The results showed that the irrigation water temperature has a significant effect on the distribution of soil water and heat. With the increase of temperature
the moisture content in the soil decreased
which shows that the water temperature of 35 ℃<20 ℃<5 ℃. The irrigation water temperature also had a great influence on the distribution of soil profile temperature
and the temperature changed 5~10 ℃ in the range of 0—15 cm in the surface layer. Under the same water temperature
with the increase of soil temperature
the saturated hydraulic conductivity of the soil increased
and the volume moisture content of the wet soil decreased
which showd that the soil temperature of 30 ℃ < 15 ℃ < 5 ℃. The migration distance of horizontal and vertical wetting front of drip irrigation increased with the increase of temperature. The migration distance and time of wetting front accorded with the power function F=atb
and the determination coefficient R2 was between 0.977 4 and 0.999 6. We established the relationship model between the migration distance of horizontal and vertical wetting front and infiltration time and temperature
in order to provide theoretical guidance for the reasonable supplement irrigation of the sand and gravel mulched ecological agriculture in the arid area of Northwest China.
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