干旱区生态环境知识资源中心(Arid): Dimensionless morphological ratios versus stream power variations at bankfull stage in an ephemeral channel

Arid

DOI	10.1016/j.geomorph.2020.107199
	Dimensionless morphological ratios versus stream power variations at bankfull stage in an ephemeral channel
	Conesa-Garcia, Carmelo; Perez-Cutillas, Pedro; Garcia-Lorenzo, Rafael; Eekhout, Joris; Gomez-Gutierrez, Alvaro; Millares-Valenzuela, Agustin; Martinez-Salvador, Alberto
通讯作者	Conesa-Garcia, C
来源期刊	GEOMORPHOLOGY
ISSN	0169-555X
EISSN	1872-695X
出版年	2020
卷号	361
英文摘要	Dimensionless morphological ratios (DMR) generally are used in systemic proposals for stream classification and river restoration projects. Often, such morphometric parameters, including field data from channel cross sections, develop into a template for a given geomorphic reference site. In this study, high-resolution Digital Terrain Models (HRDTMs), combined with orthophotographs from 2018 and ground-based surveys, were used to analyze the spatial variability of DMR in a semi-arid ephemeral stream subject to changes in stream power under bankfull conditions. In particular, a channel reach of 2.7 km in length along the Upper Mula stream in southeastern Spain was chosen to test the relationships between the two types of variables. Rosgen's DMR (width to depth ratio, entrenchment ratio, bank height ratio) and hydraulic data at bankfull stage (flow velocity, Froude number, shear stress, mean stream power and energy gradient, among others) were calculated by ID hydrodynamic modeling and HRDTMs prior entry of field information. The resulting maps allowed comparison of stream power with DMR in relation to the channel stretch class and bed stability. The results showed similar spatial patterns for the width to depth ratio and the bank height ratio. The average values estimated in bend stretches were lower than along straight and slightly sinuous stretches and very similar to those of sub-reaches from the inflection point to the meander bend apex. However, the entrenchment ratio followed a different pattern, according to which the straight and slightly sinuous stretches were the most entrenched and the bend stretches presented a more moderate average entrenchment ratio. In addition, the energy balance and power gradient also experienced spatial variations in relation to the bed stability and DMR. Only in highly incised sub-reaches were such relationships not significant. The lack of a significant correlation between excess energy and bank height ratio or width to depth ratio over short lag distances was also verified, regardless of the affected bedforms. An ANOVA showed important differences between the straight and slightly sinuous stretches and bend stretches, which were strongly influenced by the incision and entrenchment ratios and the maximum bankfull depth. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Dimensionless morphological ratios Stream power Bankfull stage Spatial patterns Ephemeral streams
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000537570000006
WOS关键词	HYDRAULIC GEOMETRY ; HUMAN IMPACTS ; ARID-REGION ; BED RIVER ; FLOOD ; GEOMORPHOLOGY ; DOWNSTREAM ; THRESHOLDS ; INCISION ; VOLUME
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/324619
作者单位	[Conesa-Garcia, Carmelo; Perez-Cutillas, Pedro; Garcia-Lorenzo, Rafael; Martinez-Salvador, Alberto] Univ Murcia, Dept Geog, Murcia, Spain; [Eekhout, Joris] CSIC, Ctr Appl Soil Sci & Biol Segura CEBAS, Soil & Water Conservat Res Grp, Murcia, Spain; [Gomez-Gutierrez, Alvaro] Univ Extremadura, GeoEnvironm Res Grp, Caceres, Spain; [Millares-Valenzuela, Agustin] Univ Granada, Grp Environm Fluid Dynam, Andalusian Inst Earth Syst Res IISTA, Granada, Spain
推荐引用方式 GB/T 7714	Conesa-Garcia, Carmelo,Perez-Cutillas, Pedro,Garcia-Lorenzo, Rafael,et al. Dimensionless morphological ratios versus stream power variations at bankfull stage in an ephemeral channel[J],2020,361.
APA	Conesa-Garcia, Carmelo.,Perez-Cutillas, Pedro.,Garcia-Lorenzo, Rafael.,Eekhout, Joris.,Gomez-Gutierrez, Alvaro.,...&Martinez-Salvador, Alberto.(2020).Dimensionless morphological ratios versus stream power variations at bankfull stage in an ephemeral channel.GEOMORPHOLOGY,361.
MLA	Conesa-Garcia, Carmelo,et al."Dimensionless morphological ratios versus stream power variations at bankfull stage in an ephemeral channel".GEOMORPHOLOGY 361(2020).