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DOI	10.1088/1748-9326/aba7e5
	What is the hydrologically effective area of a catchment?
	Liu Y.; Wagener T.; Beck H.E.; Hartmann A.
发表日期	2020
ISSN	17489318
卷号	15 期号:10
英文摘要	Topographically delineated catchments are the common spatial unit to connect human activities and climate change with their consequences for water availability as a prerequisite for sustainable water management. However, inter-catchment groundwater flow and limited connectivity within the catchment results in effective catchment areas different from those suggested by surface topography. Here, we introduce the notion of effective catchment area quantified through an effective catchment index (ECI), derived from observed streamflow, precipitation and actual evapotranspiration estimates, to understand the prevalence and significance of substantial differences between topographic and effective catchment areas in a global dataset. We evaluate our ECI analysis by comparing it to hydraulic head simulations of a global groundwater flow model and to the Budyko framework. We find that one in three studied catchments exhibit an effective catchment area either larger than double or smaller than half of their topographic area. These catchments will likely be affected by management activities such as groundwater pumping or land use change outside their topographic boundaries. Or alternatively, they affect water resources beyond their topographic boundaries. We find that the magnitude of the observed differences is strongly linked to aridity, mean slope, distance to coast, and topographic area. Our study provides a first-order identification of catchments where additional in-depth analysis of subsurface connectivity is needed to support sustainable water management. © 2020 The Author(s). Published by IOP Publishing Ltd
英文关键词	Inter-catchment groundwater flow; Topographic catchment; Water balance; Water sustainability
语种	英语
scopus关键词	Catchments; Climate change; Groundwater; Groundwater flow; Land use; Topography; Water conservation; Water management; Actual evapotranspiration; Distance to coasts; Groundwater Flow Model; Groundwater pumping; In-depth analysis; Management activities; Sustainable water management; Water availability; Runoff; catchment; climate change; connectivity; evapotranspiration; groundwater flow; hydraulic head; hydrological regime; land use change; pumping; streamflow; water availability
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153642
作者单位	Chair of Hydrological Modeling and Water Resources, University of Freiburg, Freiburg, 79098, Germany; Department of Civil Engineering, University of Bristol, Bristol, United Kingdom; Cabot Institute, University of Bristol, Bristol, United Kingdom; Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, United States
推荐引用方式 GB/T 7714	Liu Y.,Wagener T.,Beck H.E.,et al. What is the hydrologically effective area of a catchment?[J],2020,15(10).
APA	Liu Y.,Wagener T.,Beck H.E.,&Hartmann A..(2020).What is the hydrologically effective area of a catchment?.Environmental Research Letters,15(10).
MLA	Liu Y.,et al."What is the hydrologically effective area of a catchment?".Environmental Research Letters 15.10(2020).