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DOI	10.1016/j.catena.2021.105713
	Evaluation of connectivity indices applied to a Mediterranean agricultural catchment
	Hooke, Janet; Souza, Jonas; Marchamalo, Miguel
通讯作者	Hooke, J (corresponding author), Univ Liverpool, Sch Environm Sci, Roxby Bldg, Liverpool L69 7ZT, Merseyside, England.
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2021
卷号	207
英文摘要	Connectivity analysis has proved a very valuable approach in understanding runoff and sediment fluxes in catchments. Many analyses use Connectivity Indices to model the patterns, but various versions of the Index have been developed. This paper tests the effects of these variants of the Index as applied to an agricultural-terraced catchment in the semi-arid Mediterranean region where occurrence of connectivity is relatively well documented to validate the modelling. This paper compares three versions of the Connectivity Index that use vegetation/land use (C), topography (RI) and roughness (n) as the weighting factors. Two different slope algorithms are also tested. The weightings are derived from a UAV (drone) survey, with simultaneous ground field mapping. The UAV imagery is found to provide a good, high resolution basis for determining detailed topography and vegetation cover. The slope limit present in some modelling is found to be unsuitable in this landscape where steep terrace embankments that are vegetated in places, and also partially vegetated uplands, occur. Subsequent modelling removed the slope limit. The major patterns of flow produced are similar between the models and are largely related to the overall topography and major drainage lines but considerably modified by the terracing. The model outcomes differ in detail, with the C factor model, incorporating vegetation, coming nearer to the field situation. The main deficiency in all the indices is the weakness in modelling ponding and sedimentation created by the terraces, and therefore the disconnectivity in the landscape. Comparison with field data confirms the variable connectivity in rainstorms, the effects of features such as tracks, and the effect of management actions. Evidence from field mapping during the last two decades indicates that the models probably represent the maximum possible functional connectivity.
英文关键词	Connectivity Index Vegetation Soil erosion Sedimentation Drylands Disconnectivity
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000703268900124
WOS关键词	NEW-SOUTH-WALES ; SEDIMENT CONNECTIVITY ; HYDROLOGICAL CONNECTIVITY ; LANDSCAPE CONNECTIVITY ; WOLUMLA CATCHMENT ; FLOW CONNECTIVITY ; LAND DEGRADATION ; TERRACE FAILURE ; VEGETATION ; EROSION
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362815
作者单位	[Hooke, Janet] Univ Liverpool, Sch Environm Sci, Roxby Bldg, Liverpool L69 7ZT, Merseyside, England; [Souza, Jonas] Paraiba Fed Univ, Ctr Exact & Nat Sci, Geosci Dept, Joao Pessoa, Paraiba, Brazil; [Marchamalo, Miguel] Tech Univ Madrid, Dept Land Morphol & Engn, ETSI Caminos Canales & Puertos, Madrid 28040, Spain
推荐引用方式 GB/T 7714	Hooke, Janet,Souza, Jonas,Marchamalo, Miguel. Evaluation of connectivity indices applied to a Mediterranean agricultural catchment[J],2021,207.
APA	Hooke, Janet,Souza, Jonas,&Marchamalo, Miguel.(2021).Evaluation of connectivity indices applied to a Mediterranean agricultural catchment.CATENA,207.
MLA	Hooke, Janet,et al."Evaluation of connectivity indices applied to a Mediterranean agricultural catchment".CATENA 207(2021).