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Chang’an University (长安大学) 2021

Coupled Transport of Water-vapor-heat and Estimation of Phreatic Evaporation in the Vadose Zone of Mu Us Bottomland

常桐桐

Titre : Coupled Transport of Water-vapor-heat and Estimation of Phreatic Evaporation in the Vadose Zone of Mu Us Bottomland

Auteur : 常桐桐

Grade : Master 2021

Université : Chang’an University (长安大学)

Résumé partiel
The tidal land of Mu Us Lake basin belongs to the arid and semi-arid area,and there is a big difference between precipitation and evaporation.The water to maintain the ecological environment comes from the water replenished by precipitation,so the vertical water exchange is the main form of regional water cycle.In recent years,energy production,agricultural irrigation and domestic use of water have caused ecosystem problems in the area,such as overextraction of groundwater,reduction of lake area and reduction of river flow.It is an important way to improve water resources management and relieve water resources pressure to study the process of water vapor heat transport and estimation of phreatic evaporation in the vadose zone.The research results have important theoretical value and practical significance for understanding the water and energy balance in arid and semi-arid regions.Based on the basic theories of soil hydrodynamics and soil physics,field monitoring,laboratory experiments,numerical models and other research methods and means are adopted in this paper,which takes the vegetation-vade-phreatic profile in Mu Us Lake Basin as the research object.The temporal and spatial characteristics of soil moisture content,soil temperature,soil heat flux and water vapor flux at different depths were analyzed under typical evaporation and rainfall conditions.The law of moisture and heat transport in the vadular zone driven by temperature gradient and matrix potential gradient is discussed.The season of phreatic evaporation,diurnal variation and its influencing factors were further studied.

Mots clés : Shallow groundwater ;Coupled Water-Vapor-Heat Transport ;Soil temperature ;Diving evaporation ;the Mu Us bottomland ;

Présentation (CNKI)

Page publiée le 17 mars 2022