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[1]SONG Jie,LI Xiaoning,ZHAO Li,et al.Simulation Study on Movement Mechanisms of Water and Heat After Freeze-Thaw Cycles in Northwest Sichuan Plateau Based on Hydrus Model[J].Research of Soil and Water Conservation,2023,30(01):274-281.[doi:10.13869/j.cnki.rswc.2023.01.039]

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Simulation Study on Movement Mechanisms of Water and Heat After Freeze-Thaw Cycles in Northwest Sichuan Plateau Based on Hydrus Model

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 01 Page number: 274-281 Column: Public date: 2023-01-10

Title:: Simulation Study on Movement Mechanisms of Water and Heat After Freeze-Thaw Cycles in Northwest Sichuan Plateau Based on Hydrus Model

Author(s):: SONG Jie¹, LI Xiaoning², ZHAO Li¹, FAN Min¹; (1.School of Environment Resources, Southwest University of Science and Technology, Mianyang 621010, China; 2.Handan Hanlin Environmental Assessment Co., Ltd., Handan 056000, China)

Keywords:: HYDRUS model; freeze-thaw; sandy soil; hydrothermal transport; northwest Sichuan Plateau

CLC:: X24

DOI:: 10.13869/j.cnki.rswc.2023.01.039

Abstract:: The alpine region of northwest Sichuan plays an important role in water conservation and ecological balance of recharge in the upper reaches of the Yellow River and the Yangtze River. The soil in this region has been affected by day-night and seasonal freezing-thawing effects for a long time. However, the change rules of soil moisture and heat after freezing-thawing alternation and its roles in the process of grassland degradation and desertification are still unclear. The soil samples collected in the field were used for experiment of soil column to simulate the water and heat transport in the laboratory, and the finite element software HYDRUS was used to establish a one-dimensional soil column model to carry out the numerical calculation of the soil water and heat transport process of unsaturated desertification grassland and natural grassland after the freeze-thaw cycle. This study revealed the characteristics of water and heat distribution and spatial transport in soil of desertified grassland and natural grassland under different freeze-thaw interface conditions. The simulated results of soil volume moisture content of sandy grassland and natural grassland fit well with the monitored vales, and the determination coefficients(R²)were great than 0.98 with the mean values of 0.997 and 0.996, respectively. The simulation effects were reliable. In terms of soil temperature characteristics, the determination coefficients(R²)were greater than 0.98 with the mean value of 0.999. The software of HYDRUS could simulate the change characteristics of soil temperature and volumetric water content of natural grassland and sandy grassland after freeze-thaw cycle in the alpine region of northwest Sichuan. Through simulation and prediction, it was found that the soil volumetric water contents of natural grassland and sandy grassland fluctuated up and down with time, and the volumetric water content of each soil layer of natural grassland was generally higher than that of sandy grassland after freeze-thaw cycle. The simulated value of soil temperature fluctuated first and then decreased, and the soil temperature gradually decreased with the deepening of slope. The maximum temperature of each layer of sandy grassland was lower than that of natural grassland on average. The simulation results show that the calibrated soil moisture and heat transport mathematical model can better reflect the dynamic change patterns of soil moisture and heat in the alpine cold region of northwest Sichuan. Inputting the calibrated parameters and local meteorological data input into the model could effectively predict the patterns of soil water and heat transport after freeze-thaw cycle in this area. These results can provide scientific basis and theoretical support for soil desertification control and prevention and ecological balance maintenance in this area.

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Last Update: 2023-01-10