干旱区生态环境知识资源中心(Arid): New insights into the parameterization of the dry surface layer and its hydrogeochemical mechanism: An experimental study

Arid

DOI	10.1016/j.advwatres.2024.104738
	New insights into the parameterization of the dry surface layer and its hydrogeochemical mechanism: An experimental study
	Liu, Fengxia; Qian, Hui; Wang, Guangcai; Gao, Yanyan; Shi, Ziwei
通讯作者	Qian, H
来源期刊	ADVANCES IN WATER RESOURCES
ISSN	0309-1708
EISSN	1872-9657
出版年	2024
卷号	190
英文摘要	Knowledge of the parameterization of the dry surface layer (DSL) is essential for evaluating near-surface water flow and water balance in arid and semi-arid areas. Existing studies have parameterized DSL thickness and vapor flow as functions of the soil moisture content (SMC) in the surface layer to predict soil evaporation. However, hydrochemical processes related to DSL development have been ignored, including changes in hydrochemistry, the underlying hydrochemical mechanism, and the role of dissolved substances in the DSL development. Herein, we performed a series of soil evaporation experiments for 260 days and explored the factors influencing DSL development (e.g., soil texture, atmospheric temperature, SMC, solutes). Evaporation experiments were performed using silty loess, sandy loess, and fine sand with a 60 -cm water table. Results showed that the cumulative evaporation of silty loess, sandy loess, and fine sand over the experimental period were 1,391.52, 460.10, and 185.53 mm, respectively, which determined by the maximum height of liquid flow continuity. The content of total dissolved solids (TDS) and major ions at the surface soil were significantly higher than the values at deep depths of 5-55 cm, which largely depend on evaporative water loss. Evolutionary trends of chemical facies in sand media along the liquid water migration were from HCO3-Ca type to SO4 & sdot;Cl-Na type. This was attributed to mineral dissolution at a depth of 5-55 cm and their transport with liquid water, resulting in the precipitation of salt crystals at the surface soil. Furthermore, a consolidated DSL with a thickness of 3.0-3.5 cm in the sandy loess and a loose DSL with a thickness of 1.5-2.0 cm in fine sand were observed at the end of the experiments. The accumulation of solutes at the surface leads to a reduction in effective porosity and the aggregation of soil particles during continuous drying, which facilitates the consolidation of DSL in sandy loess. This overestimated the DSL thickness, resulting in a difference between the experimental and predicted evaporation rates by Fick's law. Overall, these results highlight the limitations of considering DSL thickness as a function of SMC only, providing new insights into hydrochemical processes and dissolved solutes involving DSL parameterization during continuous soil drying.
英文关键词	Soil evaporation Dry surface layer (DSL) Soil moisture content (SMC) Dissolved solute Hydrogeochemical process
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001251785800001
WOS关键词	SOIL-MOISTURE ; LOESS PLATEAU ; POROUS-MEDIA ; COLLAPSE BEHAVIOR ; VAPOR FLOW ; EVAPORATION ; WATER ; RESISTANCE ; TRANSPORT ; PRECIPITATION
WOS类目	Water Resources
WOS研究方向	Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/402617
推荐引用方式 GB/T 7714	Liu, Fengxia,Qian, Hui,Wang, Guangcai,et al. New insights into the parameterization of the dry surface layer and its hydrogeochemical mechanism: An experimental study[J],2024,190.
APA	Liu, Fengxia,Qian, Hui,Wang, Guangcai,Gao, Yanyan,&Shi, Ziwei.(2024).New insights into the parameterization of the dry surface layer and its hydrogeochemical mechanism: An experimental study.ADVANCES IN WATER RESOURCES,190.
MLA	Liu, Fengxia,et al."New insights into the parameterization of the dry surface layer and its hydrogeochemical mechanism: An experimental study".ADVANCES IN WATER RESOURCES 190(2024).