globalchange  > 气候变化与战略
DOI: 10.5194/hess-23-971-2019
论文题名:
Energy states of soil water - A thermodynamic perspective on soil water dynamics and storage-controlled streamflow generation in different landscapes
作者: Zehe E.; Loritz R.; Jackisch C.; Westhoff M.; Kleidon A.; Blume T.; Hassler S.K.; Savenije H.H.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期:2
起始页码: 971
结束页码: 987
语种: 英语
Scopus关键词: Electron energy levels ; Free energy ; Potential energy ; Stream flow ; Capillarity control ; Hydrological years ; Local equilibrium state ; Local thermodynamic equilibrium ; Soil physical property ; Soil water dynamics ; Streamflow generations ; System characteristics ; Soil moisture ; capillarity ; comparative study ; drainage ; landscape change ; physical property ; potential energy ; riparian zone ; soil water ; streamflow ; thermodynamics ; water storage
英文摘要: The present study confirms that a thermodynamic perspective on soil water is well suited to distinguishing the typical interplay of gravity and capillarity controls on soil water dynamics in different landscapes. To this end, we express the driving matric and gravity potentials by their energetic counterparts and characterize soil water by its free energy state. The latter is the key to defining a new system characteristic determining the possible range of energy states of soil water, reflecting the joint influences of soil physical properties and height over nearest drainage (HAND) in a stratified manner. As this characteristic defines the possible range of energy states of soil water in the root zone, it also allows an instructive comparison of top soil water dynamics observed in two distinctly different landscapes. This is because the local thermodynamic equilibrium at a given HAND and the related equilibrium storage allow a subdivision of the possible free energy states into two different regimes. Wetting of the soil in local equilibrium implies that free energy of soil water becomes positive, which in turn implies that the soil is in a state of storage excess, while further drying of the soil leads to a negative free energy and a state of storage deficit. We show that during 1 hydrological year the energy states of soil water visit distinctly different parts of their respective energy state spaces. The two study areas compared here exhibit furthermore a threshold-like relation between the observed free energy of soil water in the riparian zone and observed streamflow, while the tipping points coincide with the local equilibrium state of zero free energy. We found that the emergence of a potential energy excess/storage excess in the riparian zone coincides with the onset of storage-controlled direct streamflow generation. While such threshold behaviour is not unusual, it is remarkable that the tipping point is consistent with the underlying theoretical basis. © Author(s) 2019.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163045
Appears in Collections:气候变化与战略

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作者单位: Zehe, E., Department of Civil Engineering, Geo and Environmental Sciences, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; Loritz, R., Department of Civil Engineering, Geo and Environmental Sciences, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; Jackisch, C., Department of Civil Engineering, Geo and Environmental Sciences, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; Westhoff, M., Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, 1081 HV, Netherlands; Kleidon, A., Max Planck Institute for Bio-Geo-Chemistry, Jena, Germany; Blume, T., GFZ German Research Centre for Geosciences, Potsdam, Germany; Hassler, S.K., Department of Civil Engineering, Geo and Environmental Sciences, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; Savenije, H.H., Department of Geosystems, Section 4.4 Hydrology, Delft Technical University, Delft, Netherlands

Recommended Citation:
Zehe E.,Loritz R.,Jackisch C.,et al. Energy states of soil water - A thermodynamic perspective on soil water dynamics and storage-controlled streamflow generation in different landscapes[J]. Hydrology and Earth System Sciences,2019-01-01,23(2)
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