DOI: 10.5194/hess-22-1947-2018
Scopus记录号: 2-s2.0-85044249340
论文题名: Topography significantly influencing low flows in snow-dominated watersheds
作者: Li Q ; , Wei X ; , Yang X ; , Giles-Hansen K ; , Zhang M ; , Liu W
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2018
卷: 22, 期: 3 起始页码: 1947
结束页码: 1956
语种: 英语
Scopus关键词: Factor analysis
; Linear regression
; Regression analysis
; Snow
; Topography
; British Columbia , Canada
; Environmental fields
; Hydrological process
; Multiple linear regression models
; Relative contribution
; Spatial heterogeneity
; Terrain characterization
; Watershed topography
; Watersheds
; factor analysis
; heterogeneity
; low flow
; spatial analysis
; surface area
; terrain
; topography
; watershed
英文摘要: Watershed topography plays an important role in determining the spatial heterogeneity of ecological, geomorphological, and hydrological processes. Few studies have quantified the role of topography in various flow variables. In this study, 28 watersheds with snow-dominated hydrological regimes were selected with daily flow records from 1989 to 1996. These watersheds are located in the Southern Interior of British Columbia, Canada, and range in size from 2.6 to 1780 km2. For each watershed, 22 topographic indices (TIs) were derived, including those commonly used in hydrology and other environmental fields. Flow variables include annual mean flow (Qmean/, Q10%, Q25%, Q50%, Q75%, Q90%, and annual minimum flow (Qmin/, where Qx % is defined as the daily flow that occurred each year at a given percentage (x). Factor analysis (FA) was first adopted to exclude some redundant or repetitive TIs. Then, multiple linear regression models were employed to quantify the relative contributions of TIs to each flow variable in each year. Our results show that topography plays a more important role in low flows (flow magnitudes ≤Q75%/than high flows. However, the effects of TIs on different flow magnitudes are not consistent. Our analysis also determined five significant TIs: Perimeter, slope length factor, surface area, openness, and terrain characterization index. These can be used to compare watersheds when low flow assessments are conducted, specifically in snow-dominated regions with the watershed size less than several thousand square kilometres. © 2018 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79352
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth, Environmental and Geographic Sciences, University of British Columbia, 1177 Research Road, Kelowna, BC, Canada; Key Laboratory of Virtual Geographic Environment, Nanjing Normal University, Ministry of Education, Nanjing, China; State Key Laboratory Cultivation Base of Geographical Environment Evolution, Nanjing, China; Jiangsu Center for Collaborative Innovation in Geographical Information, Nanjing, China; School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu, China; Institute of Ecology and Environmental Science, Nanchang Institute of Technology, Nanchang, China
Recommended Citation:
Li Q,, Wei X,, Yang X,et al. Topography significantly influencing low flows in snow-dominated watersheds[J]. Hydrology and Earth System Sciences,2018-01-01,22(3)