气候变化领域集成服务门户(CCPortal): Energy states of soil water - A thermodynamic perspective on soil water dynamics and storage-controlled streamflow generation in different landscapes

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DOI	10.5194/hess-23-971-2019
	Energy states of soil water - A thermodynamic perspective on soil water dynamics and storage-controlled streamflow generation in different landscapes
	Zehe E.; Loritz R.; Jackisch C.; Westhoff M.; Kleidon A.; Blume T.; Hassler S.K.; Savenije H.H.
发表日期	2019
ISSN	1027-5606
起始页码	971
结束页码	987
卷号	23 期号:2
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.
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
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159755
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
推荐引用方式 GB/T 7714	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],2019,23(2).
APA	Zehe E..,Loritz R..,Jackisch C..,Westhoff M..,Kleidon A..,...&Savenije H.H..(2019).Energy states of soil water - A thermodynamic perspective on soil water dynamics and storage-controlled streamflow generation in different landscapes.Hydrology and Earth System Sciences,23(2).
MLA	Zehe E.,et al."Energy states of soil water - A thermodynamic perspective on soil water dynamics and storage-controlled streamflow generation in different landscapes".Hydrology and Earth System Sciences 23.2(2019).