DOI: 10.5194/hess-23-5017-2019
论文题名: Effects of preferential flow on snowmelt partitioning and groundwater recharge in frozen soils
作者: Mohammed A.A. ; Pavlovskii I. ; Cey E.E. ; Hayashi M.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期: 12 起始页码: 5017
结束页码: 5031
语种: 英语
Scopus关键词: Groundwater flow
; Infiltration
; Landforms
; Ponding
; Recharging (underground waters)
; Runoff
; Snow
; Snow melting systems
; Soil moisture
; Thawing
; Canadian prairie
; Ground water recharge
; Lateral transport
; Preferential flows
; Rapid infiltration
; Runoff generation
; Shallow subsurface
; Topographic positions
; Frozen soils
; frozen ground
; grassland soil
; groundwater flow
; infiltration
; macropore
; preferential flow
; recharge
; snow cover
; snowmelt
; soil moisture
; vadose zone
; Prairie Provinces
英文摘要: Snowmelt is a major source of groundwater recharge in cold regions. Throughout many landscapes snowmelt occurs when the ground is still frozen; thus frozen soil processes play an important role in snowmelt routing, and, by extension, the timing and magnitude of recharge. This study investigated the vadose zone dynamics governing snowmelt infiltration and groundwater recharge at three grassland sites in the Canadian Prairies over the winter and spring of 2017. The region is characterized by numerous topographic depressions where the ponding of snowmelt runoff results in focused infiltration and recharge. Water balance estimates showed infiltration was the dominant sink (35 %-85 %) of snowmelt under uplands (i.e. areas outside of depressions), even when the ground was frozen, with soil moisture responses indicating flow through the frozen layer. The refreezing of infiltrated meltwater during winter melt events enhanced runoff generation in subsequent melt events. At one site, time lags of up to 3 d between snow cover depletion on uplands and ponding in depressions demonstrated the role of a shallow subsurface transmission pathway or interflow through frozen soil in routing snowmelt from uplands to depressions. At all sites, depression-focused infiltration and recharge began before complete ground thaw and a significant portion (45 %-100 %) occurred while the ground was partially frozen. Relatively rapid infiltration rates and non-sequential soil moisture and groundwater responses, observed prior to ground thaw, indicated preferential flow through frozen soils. The preferential flow dynamics are attributed to macropore networks within the grassland soils, which allow infiltrated meltwater to bypass portions of the frozen soil matrix and facilitate both the lateral transport of meltwater between topographic positions and groundwater recharge through frozen ground. Both of these flow paths may facilitate preferential mass transport to groundwater.. © 2019 American Institute of Physics Inc.. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162838
Appears in Collections: 气候变化与战略
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作者单位: Mohammed, A.A., Department of Geoscience, University of Calgary, Alberta, T2N 1N4, Canada; Pavlovskii, I., Department of Geoscience, University of Calgary, Alberta, T2N 1N4, Canada, Golder Associates Ltd., Calgary, AB T2A 7W5, Canada; Cey, E.E., Department of Geoscience, University of Calgary, Alberta, T2N 1N4, Canada; Hayashi, M., Department of Geoscience, University of Calgary, Alberta, T2N 1N4, Canada
Recommended Citation:
Mohammed A.A.,Pavlovskii I.,Cey E.E.,et al. Effects of preferential flow on snowmelt partitioning and groundwater recharge in frozen soils[J]. Hydrology and Earth System Sciences,2019-01-01,23(12)