气候变化领域集成服务门户(CCPortal): Investigation on hydrothermal behavior of seasonally frozen ground in the Qinghai-Tibet Plateau based on dynamic inverse modelling approach

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DOI	10.1016/j.coldregions.2023.104015
	Investigation on hydrothermal behavior of seasonally frozen ground in the Qinghai-Tibet Plateau based on dynamic inverse modelling approach
	Yanchen, Guo; Zhihong, Zhang; Fuchu, Dai
发表日期	2024
ISSN	0165-232X
EISSN	1872-7441
卷号	217
英文摘要	Exploring hydrothermal behavior of soil of the Qinghai-Tibet Plateau is essential to uncover the mechanism of frequent freeze-thaw disasters triggered by warming climate. This study applies a hydrothermal coupled model for freeze-thaw soil to describe hydrothermal behavior, and proposes dynamic inverse modelling approach driven by multi-source time-series data to determine time-dependent hydrothermal parameters, where backpropagation neural network, genetic algorithm and orthogonal design were integrated. The proposed approach can achieve the precise determination of six time-dependent hydrothermal parameters including isothermal and thermal hydraulic conductivities for liquid water and water vapor, thermal conductivity, and volumetric heat capacity, which comprehensively reflect the coupling characteristics of soil influenced by complex external environment. Selecting a typical research area in seasonally frozen ground of the QTP, the proposed method was utilized to explore the hydrothermal properties during freezing period and evolution of thermo-hydraulic behavior within seasonally freeze-thaw layer under climate warming. The results indicated that it is suitable for the proposed approach to reasonably obtain the time-dependent hydrothermal parameters. With the 2.15 degrees Cincrease in air temperature after 50 years, the most significant increment of 88.5% for surface heat flux induces the conspicuous rise of soil temperature within 1.1 m and evident shrink of 30-days for freezing duration. The most striking enhancement of soil temperature appeared at the depth of 0.15 m, which is up to 1.8 degrees C. However, the obviously decreasing hydraulic conductivities caused a weak reduction in water content within the depth of 0.70 m. Long-term warming climate ultimately leads to the thickening seasonally freeze-thaw layer, which is unfavorable for permafrost stability and slope stability. This study provides guidance for clarifying the mechanism of freeze-thaw disasters on the QTP under warming and humidifying climate.
关键词	Qinghai-Tibet Plateau Seasonally frozen ground Hydrothermal dynamics Climate warming Inverse modelling
英文关键词	THERMAL-MOISTURE DYNAMICS; SURFACE-ENERGY BUDGET; DAM FOUNDATION; COUPLED HEAT; HYDRAULIC CONDUCTIVITY; NUMERICAL-ANALYSIS; PERMAFROST REGION; NEURAL-NETWORK; ACTIVE LAYER; WATER
WOS研究方向	Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary
WOS记录号	WOS:001086959800001
来源期刊	COLD REGIONS SCIENCE AND TECHNOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282906
作者单位	Beijing University of Technology
推荐引用方式 GB/T 7714	Yanchen, Guo,Zhihong, Zhang,Fuchu, Dai. Investigation on hydrothermal behavior of seasonally frozen ground in the Qinghai-Tibet Plateau based on dynamic inverse modelling approach[J],2024,217.
APA	Yanchen, Guo,Zhihong, Zhang,&Fuchu, Dai.(2024).Investigation on hydrothermal behavior of seasonally frozen ground in the Qinghai-Tibet Plateau based on dynamic inverse modelling approach.COLD REGIONS SCIENCE AND TECHNOLOGY,217.
MLA	Yanchen, Guo,et al."Investigation on hydrothermal behavior of seasonally frozen ground in the Qinghai-Tibet Plateau based on dynamic inverse modelling approach".COLD REGIONS SCIENCE AND TECHNOLOGY 217(2024).