气候变化领域集成服务门户(CCPortal): A topographic index explaining hydrological similarity by accounting for the joint controls of runoff formation

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DOI	10.5194/hess-23-3807-2019
	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.
发表日期	2019
ISSN	1027-5606
起始页码	3807
结束页码	3821
卷号	23 期号:9
英文摘要	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. In fact, such losses dominate when rainfall becomes runoff, and only a tiny portion of the driving potential energy is actually transformed into the kinetic energy of streamflow. In recognition of this, we derive a topographic index called reduced dissipation per unit length index (rDUNE) by reinterpreting and enhancing HAND following a straightforward thermodynamic argumentation. We compare rDUNE with HAND, and with the frequently used topographic wetness index (TWI), and show that rDUNE provides stronger discrimination of catchments into groups that are similar with respect to their dominant runoff processes. Our analysis indicates that accounting for both the driver and resistance aspects of flux generation provides a promising approach for linking the architecture of a system with its functioning and is hence an appropriate basis for developing similarity indices in hydrology. © Author(s) 2019. This work is distributed under ]the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	Catchments; Energy dissipation; Entropy; Gravitation; Kinetic energy; Kinetics; Molecular physics; Potential energy; Topography; Digital elevation model; Dissipative energy loss; Dominant runoff process; Gravitational potential energy; Hydrological landscape; Runoff generation mechanisms; Second Law of Thermodynamics; Topographic wetness index; Runoff; catchment; dissipation; drainage; entropy; kinetic energy; potential energy; streamflow; topography
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/159608
作者单位	Loritz, R., Institute for Water and River Basin Management, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; Kleidon, A., Max-Planck-Institut für Biogeochemie, Jena, Germany; Jackisch, C., Institute for Water and River Basin Management, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany, Institute of Geoecology, Department of Landscape Ecology and Environmental Systems Analysis, Technische Universität Braunschweig, Braunschweig, Germany; Westhoff, M., Faculty of Earth Science, Vrije Universiteit, Amsterdam, Netherlands; Ehret, U., Institute for Water and River Basin Management, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; Gupta, H., Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ, United States; Zehe, E., Institute for Water and River Basin Management, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
推荐引用方式 GB/T 7714	Loritz R.,Kleidon A.,Jackisch C.,et al. A topographic index explaining hydrological similarity by accounting for the joint controls of runoff formation[J],2019,23(9).
APA	Loritz R..,Kleidon A..,Jackisch C..,Westhoff M..,Ehret U..,...&Zehe E..(2019).A topographic index explaining hydrological similarity by accounting for the joint controls of runoff formation.Hydrology and Earth System Sciences,23(9).
MLA	Loritz R.,et al."A topographic index explaining hydrological similarity by accounting for the joint controls of runoff formation".Hydrology and Earth System Sciences 23.9(2019).