气候变化领域集成服务门户(CCPortal): Understanding the relative importance of vertical and horizontal flow in ice-wedge polygons

CCPortal

DOI	10.5194/hess-24-1109-2020
	Understanding the relative importance of vertical and horizontal flow in ice-wedge polygons
	Wales N.A.; Gomez-Velez J.D.; Newman B.D.; Wilson C.J.; Dafflon B.; Kneafsey T.J.; Soom F.; Wullschleger S.D.
发表日期	2020
ISSN	1027-5606
起始页码	1109
结束页码	1129
卷号	24 期号:3
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.
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
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159478
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; Wullsch...
推荐引用方式 GB/T 7714	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],2020,24(3).
APA	Wales N.A..,Gomez-Velez J.D..,Newman B.D..,Wilson C.J..,Dafflon B..,...&Wullschleger S.D..(2020).Understanding the relative importance of vertical and horizontal flow in ice-wedge polygons.Hydrology and Earth System Sciences,24(3).
MLA	Wales N.A.,et al."Understanding the relative importance of vertical and horizontal flow in ice-wedge polygons".Hydrology and Earth System Sciences 24.3(2020).