NDLI: Diurnal pattern of liquid water and water vapor movement affected by rainfall in a desert soil with a high water table

Content Provider	Springer Nature Link
Author	Huang, Jinting Hou, Rongzhe Yang, Hongbin
Copyright Year	2015
Abstract	Because arid and semi-arid regions have relatively low soil moisture, water vapor movement often occurs predominantly in the unsaturated zone, affecting the partitioning of energy among various land surface fluxes. To understand the hydrological processes of the unsaturated zone in desert areas, it is important to characterize the diurnal and spatial variations in soil water and vapor movement, which control recharge and discharge via the unsaturated zone. However, few studies have examined the pattern of soil water and vapor movement affected by rainfall in desert areas. To understand this process, field observations of desert soil physical parameters and micrometeorological variables were taken. These data were used to verify and calibrate the performance of an unsaturated–saturated zone soil water balance model, Hydrus-1D. Next, the diurnal pattern of the soil water and vapor was simulated under different climatic conditions, i.e., before, during and after rainfall. Two stages of thermal liquid and vapor movement were identified before rainfall. The thermal liquid flux fluctuates quickly and drastically, while the thermal vapor changes more moderately during and after rainfall. The changes in isothermal liquid and vapor flux differ from those of thermal liquid and vapor flux because of the change in the pressure head gradient under various wetness conditions. These findings offer insight into how water vapor affects soil water movement in the semiarid desert. They also improve our understanding of the liquid water and water vapor movement processes following rainfall.
Starting Page	1
Ending Page	16
Page Count	16
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	1
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-12-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Vadose zone Liquid water and water vapor flow Heat transport Rainfall Hydrus-1D Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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