气候变化领域集成服务门户(CCPortal): Impacts of changing hydrology on permanent gully growth: Experimental results

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DOI	10.5194/hess-22-3261-2018
	Impacts of changing hydrology on permanent gully growth: Experimental results
	Day S.S.; Gran K.B.; Paola C.
发表日期	2018
ISSN	1027-5606
起始页码	3261
结束页码	3273
卷号	22 期号:6
英文摘要	Permanent gullies grow through head cut propagation in response to overland flow coupled with incision and widening in the channel bottom leading to hillslope failures. Altered hydrology can impact the rate at which permanent gullies grow by changing head cut propagation, channel incision, and channel widening rates. Using a set of small physical experiments, we tested how changing overland flow rates and flow volumes alter the total volume of erosion and resulting gully morphology. Permanent gullies were modeled as both detachment-limited and transport-limited systems, using two different substrates with varying cohesion. In both cases, the erosion rate varied linearly with water discharge, such that the volume of sediment eroded was a function not of flow rate, but of total water volume. This implies that efforts to reduce peak flow rates alone without addressing flow volumes entering gully systems may not reduce erosion. The documented response in these experiments is not typical when compared to larger preexisting channels where higher flow rates result in greater erosion through nonlinear relationships between water discharge and sediment discharge. Permanent gullies do not respond like preexisting channels because channel slope remains a free parameter and can adjust relatively quickly in response to changing flows. © 2018 Author(s).
语种	英语
scopus关键词	Erosion; Flow rate; Hydrology; Channel widening; Different substrates; Free parameters; Non-linear relationships; Overland flow rates; Physical experiments; Sediment discharge; Water discharges; Landforms; channel flow; discharge; experimental study; gully erosion; hillslope; hydrological change; overland flow; peak flow; water erosion
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/160003
作者单位	Day, S.S., Department of Geosciences, North Dakota State University, Fargo, ND 58102, United States; Gran, K.B., Department of Earth and Environmental Sciences, University of Minnesota Duluth, Duluth, MN 55812, United States; Paola, C., Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, United States
推荐引用方式 GB/T 7714	Day S.S.,Gran K.B.,Paola C.. Impacts of changing hydrology on permanent gully growth: Experimental results[J],2018,22(6).
APA	Day S.S.,Gran K.B.,&Paola C..(2018).Impacts of changing hydrology on permanent gully growth: Experimental results.Hydrology and Earth System Sciences,22(6).
MLA	Day S.S.,et al."Impacts of changing hydrology on permanent gully growth: Experimental results".Hydrology and Earth System Sciences 22.6(2018).