DOI: 10.1002/2014GL061099
论文题名: A hydrogeomorphic river network model predicts where and why hyporheic exchange is important in large basins
作者: Gomez-Velez J.D. ; Harvey J.W.
刊名: Geophysical Research Letters
ISSN: 0094-9794
EISSN: 1944-9525
出版年: 2014
卷: 41, 期: 18 起始页码: 6403
结束页码: 6412
语种: 英语
英文关键词: denitrification
; groundwater-surface water interactions
; hyporheic exchange
; river basin modeling
; river biogeochemistry
; river networks
Scopus关键词: Biogeochemistry
; Denitrification
; Digital storage
; Groundwater
; Hydrogeology
; Stream flow
; Watersheds
; Groundwater - surface water interactions
; Hyporheic exchange
; Hyporheic exchange flow
; Intrinsic potential
; Orders of magnitude
; Physically based modeling
; River basins
; River network
; Rivers
; biogeochemistry
; biotransformation
; data set
; denitrification
; geomorphology
; groundwater-surface water interaction
; hydrogeology
; hydrological modeling
; hyporheic zone
; prediction
; river basin
; river flow
英文摘要: Hyporheic exchange has been hypothesized to have basin-scale consequences; however, predictions throughout river networks are limited by available geomorphic and hydrogeologic data and by models that can analyze and aggregate hyporheic exchange flows across large spatial scales. We developed a parsimonious but physically based model of hyporheic flow for application in large river basins: Networks with EXchange and Subsurface Storage (NEXSS). We applied NEXSS across a broad range of geomorphic diversity in river reaches and synthetic river networks. NEXSS demonstrates that vertical exchange beneath submerged bed forms rather than lateral exchange through meanders dominates hyporheic fluxes and turnover rates along river corridors. Per kilometer, low-order streams have a biogeochemical potential at least 2 orders of magnitude larger than higher-order streams. However, when biogeochemical potential is examined per average length of each stream order, low- and high-order streams were often found to be comparable. As a result, the hyporheic zone's intrinsic potential for biogeochemical transformations is comparable across different stream orders, but the greater river miles and larger total streambed area of lower order streams result in the highest cumulative impact from low-order streams. Lateral exchange through meander banks may be important in some cases but generally only in large rivers. Key Points Physically based model predicts hyporheic exchange in any lowland riverVertical exchange rather than lateral exchange dominates hyporheic flow in river networksReaction potential is comparable for small and large streams ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911058916&doi=10.1002%2f2014GL061099&partnerID=40&md5=8a61d3035f8fb9747d675007a314f1d6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7058
Appears in Collections: 气候减缓与适应
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作者单位: Postdoctoral Associate, U.S. Geological Survey, Reston, VA, United States
Recommended Citation:
Gomez-Velez J.D.,Harvey J.W.. A hydrogeomorphic river network model predicts where and why hyporheic exchange is important in large basins[J]. Geophysical Research Letters,2014-01-01,41(18).