globalchange  > 气候变化与战略
DOI: 10.5194/hess-24-1109-2020
论文题名:
Understanding the relative importance of vertical and horizontal flow in ice-wedge polygons
作者: Wales N.A.; Gomez-Velez J.D.; Newman B.D.; Wilson C.J.; Dafflon B.; Kneafsey T.J.; Soom F.; Wullschleger S.D.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期:3
起始页码: 1109
结束页码: 1129
语种: 英语
Scopus关键词: Geomorphology ; Groundwater flow ; Ice ; Landforms ; Topography ; Conservative tracers ; Environmental observatories ; Horizontal hydraulic conductivities ; Hydrological characteristics ; Hydrological models ; Micro topography ; Preferential flows ; Tracer concentration ; Geometry ; hydraulic conductivity ; hydrological modeling ; landform ; microtopography ; polygon ; subsurface flow ; Alaska ; Arctic ; Barrow ; United States
英文摘要: Ice-wedge polygons are common Arctic landforms. The future of these landforms in a warming climate depends on the bidirectional feedback between the rate of ice-wedge degradation and changes in hydrological characteristics. This work aims to better understand the relative roles of vertical and horizontal water fluxes in the subsurface of polygonal landscapes, providing new insights and data to test and calibrate hydrological models. Field-scale investigations were conducted at an intensively instrumented location on the Barrow Environmental Observatory (BEO) near Utqiagvik, AK, USA. Using a conservative tracer, we examined controls of microtopography and the frost table on subsurface flow and transport within a low-centered and a high-centered polygon. Bromide tracer was applied at both polygons in July 2015 and transport was monitored through two thaw seasons. Sampler arrays placed in polygon centers, rims, and troughs were used to monitor tracer concentrations. In both polygons, the tracer first infiltrated vertically until encountering the frost table and was then transported horizontally. Horizontal flow occurred in more locations and at higher velocities in the low-centered polygon than in the high-centered polygon. Preferential flow, influenced by frost table topography, was significant between polygon centers and troughs. Estimates of horizontal hydraulic conductivity were within the range of previous estimates of vertical conductivity, highlighting the importance of horizontal flow in these systems. This work forms a basis for understanding complexity of flow in polygonal landscapes. Copyright © 2020by Morgan & Claypool.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162768
Appears in Collections:气候变化与战略

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作者单位: Wales, N.A., Los Alamos National Laboratory, Los Alamos, NM 87545, United States, Hydrology Program, Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, NM 87801, United States; Gomez-Velez, J.D., Hydrology Program, Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, NM 87801, United States, Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN 37235, United States; Newman, B.D., Los Alamos National Laboratory, Los Alamos, NM 87545, United States; Wilson, C.J., Los Alamos National Laboratory, Los Alamos, NM 87545, United States; Dafflon, B., Earth Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Kneafsey, T.J., Earth Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Soom, F., Earth Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Wullschleger, S.D., Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6301, United States

Recommended Citation:
Wales N.A.,Gomez-Velez J.D.,Newman B.D.,et al. Understanding the relative importance of vertical and horizontal flow in ice-wedge polygons[J]. Hydrology and Earth System Sciences,2020-01-01,24(3)
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