Article (Scientific journals)
Importance of temporal variability for hydrological predictions based on the maximum entropy production principle
Westhoff, Martijn; Zehe, Erwin; Schymanski, Stanislaus J.
2014In Geophysical Research Letters
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Keywords :
maximum entropy production; thermodynamics; influence of temporal dynamics
Abstract :
[en] This work builds on earlier work by Kleidon and Schymanski (2008) who explored the use of the maximum entropy production (MEP) principle for modeling hydrological systems. They illustrated that MEP can be used to determine the partitioning of soil water into runoff and evaporation—which determines hydroclimatic conditions around the Globe—by optimizing effective soil and canopy conductances in a way to maximize entropy production by these fluxes. In the present study, we show analytically that under their assumption of constant rainfall, the proposed principle always yields an optimum where the two conductances are equal, irrespective of rainfall rate, evaporative demand, or gravitational potential. Subsequently, we show that under periodic forcing or periodic variations in one resistance (e.g., vegetation seasonality), the optimal conductance does depend on climatic drivers such as the length of dry spells or the time of closure of stomata.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Westhoff, Martijn ;  Université de Liège - ULiège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
Zehe, Erwin
Schymanski, Stanislaus J.
Language :
English
Title :
Importance of temporal variability for hydrological predictions based on the maximum entropy production principle
Publication date :
2014
Journal title :
Geophysical Research Letters
ISSN :
0094-8276
eISSN :
1944-8007
Publisher :
Wiley, Washington, United States - District of Columbia
Pages :
n/a-n/a
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 23 January 2015

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