气候变化领域集成服务门户(CCPortal): Expansion and contraction of the flowing stream network alter hillslope flowpath lengths and the shape of the travel time distribution

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DOI	10.5194/hess-23-4825-2019
	Expansion and contraction of the flowing stream network alter hillslope flowpath lengths and the shape of the travel time distribution
	Ilja Van Meerveld H.J.; Kirchner J.W.; Vis M.J.P.; Assendelft R.S.; Seibert J.
发表日期	2019
ISSN	1027-5606
起始页码	4825
结束页码	4834
卷号	23 期号:11
英文摘要	Flowing stream networks dynamically extend and retract, both seasonally and in response to precipitation events. These network dynamics can dramatically alter the drainage density and thus the length of subsurface flow pathways to flowing streams. We mapped flowing stream networks in a small Swiss headwater catchment during different wetness conditions and estimated their effects on the distribution of travel times to the catchment outlet. For each point in the catchment, we determined the subsurface transport distance to the flowing stream based on the surface topography and determined the surface transport distance along the flowing stream to the outlet. We combined the distributions of these travel distances with assumed surface and subsurface flow velocities to estimate the distribution of travel times to the outlet. These calculations show that the extension and retraction of the stream network can substantially change the mean travel time and the shape of the travel time distribution. During wet conditions with a fully extended flowing stream network, the travel time distribution was strongly skewed to short travel times, but as the network retracted during dry conditions, the distribution of the travel times became more uniform. Stream network dynamics are widely ignored in catchment models, but our results show that they need to be taken into account when modeling solute transport and interpreting travel time distributions. © 2019 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	Catchments; Runoff; Solute transport; Topography; Expansion and contraction; Headwater catchment; Network dynamics; Precipitation events; Subsurface transport; Surface and subsurface flow; Surface transport; Travel time distributions; Travel time; catchment; headwater; hillslope; precipitation (climatology); solute transport; streamflow; subsurface flow; travel time
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/159558
作者单位	Ilja Van Meerveld, H.J., Dept. of Geography, University of Zurich, Winterthurerstrasse 190, Zurich, 8057, Switzerland; Kirchner, J.W., Dept. of Environmental System Sciences, ETH Zurich, Zurich, 8092, Switzerland, Swiss Federal Research Institute WSL, Birmensdorf, 8903, Switzerland, Dept. of Earth and Planetary Science, University of California, Berkeley, CA 94720, United States; Vis, M.J.P., Dept. of Geography, University of Zurich, Winterthurerstrasse 190, Zurich, 8057, Switzerland; Assendelft, R.S., Dept. of Geography, University of Zurich, Winterthurerstrasse 190, Zurich, 8057, Switzerland; Seibert, J., Dept. of Geography, University of Zurich, Winterthurerstrasse 190, Zurich, 8057, Switzerland, Dept. of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, P.O. Box 7050, Uppsala, 75007, Sweden
推荐引用方式 GB/T 7714	Ilja Van Meerveld H.J.,Kirchner J.W.,Vis M.J.P.,et al. Expansion and contraction of the flowing stream network alter hillslope flowpath lengths and the shape of the travel time distribution[J],2019,23(11).
APA	Ilja Van Meerveld H.J.,Kirchner J.W.,Vis M.J.P.,Assendelft R.S.,&Seibert J..(2019).Expansion and contraction of the flowing stream network alter hillslope flowpath lengths and the shape of the travel time distribution.Hydrology and Earth System Sciences,23(11).
MLA	Ilja Van Meerveld H.J.,et al."Expansion and contraction of the flowing stream network alter hillslope flowpath lengths and the shape of the travel time distribution".Hydrology and Earth System Sciences 23.11(2019).