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A topographic index explaining hydrological similarity by accounting for the joint controls of runoff formation

Loritz, R.; Kleidon, A.; Jackisch, C.; Westhoff, M.; Ehret, U.; Gupta, H.; Zehe, E.

Abstract:
Surface topography is an important source of information about the functioning and form of a hydrological landscape. Because of its key role in explaining hydrological processes and structures, and also because of its wide availability at good resolution in the form of digital elevation models (DEMs), it is frequently used to inform hydrological analyses. Not surprisingly, several hydrological indices and models have been proposed for linking geomorphic properties of a landscape with its hydrological functioning; a widely used example is the “height above the nearest drainage” (HAND) index. From an energy-centered perspective HAND reflects the gravitational potential energy of a given unit mass of water located on a hillslope, with the reference level set to the elevation of the nearest corresponding river. Given that potential energy differences are the main drivers for runoff generation, HAND distributions provide important proxies to explain runoff generation in catchments. However, as expressed by the second law of thermodynamics, the driver of a flux explains only one aspect of the runoff generation mechanism, with the driving potential of every flux being depleted via entropy production and dissipative energy loss. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000098521
Veröffentlicht am 01.10.2019
Originalveröffentlichung
DOI: 10.5194/hess-23-3807-2019
Coverbild
Zugehörige Institution(en) am KIT Institut für Wasser und Gewässerentwicklung (IWG)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 1027-5606, 1607-7938
KITopen-ID: 1000098521
Erschienen in Hydrology and earth system sciences
Band 23
Heft 9
Seiten 3807-3821
Nachgewiesen in Scopus
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