Estimating 3D variation in active-layer thickness beneath arctic streams using ground-penetrating radar

• Published in: Journal of hydrology (Amsterdam) Vol. 373; no. 3; pp. 479 - 486
• Main Authors: Brosten, Troy R., Bradford, John H., McNamara, James P., Gooseff, Michael N., Zarnetske, Jay P., Bowden, William B., Johnston, Morgan E.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15-07-2009; [Amsterdam; New York]: Elsevier; Elsevier
• Subjects: 3D ground-penetrating radar; Applied geophysics; Arctic streams; Earth sciences; Earth, ocean, space; Exact sciences and technology; Freshwater; Hydrology; Hydrology. Hydrogeology; Hyporheic; Internal geophysics; Permafrost; Thaw bulb; polar regions; Alaska; United States; Arctic region; North Slope; PN, Arctic; 3D ground-penetrating radar; Hyporheic; Thaw bulb; Arctic streams; Permafrost; active layer; morphology; thickness; streams; transport; North America; bars; ground-penetrating radar; gravel; depth; channels; permafrost; interpretation; three-dimensional models; geometry; soils; peat
• ISSN: 0022-1694; 1879-2707
• DOI: 10.1016/j.jhydrol.2009.05.011

We acquired three-dimensional (3D) ground-penetrating radar (GPR) data across three stream sites on the North Slope, AK, in August 2005, to investigate the dependence of thaw depth on channel morphology. Data were migrated with mean velocities derived from multi-offset GPR profiles collected across a stream section within each of the 3D survey areas. GPR data interpretations from the alluvial-lined stream site illustrate greater thaw depths beneath riffle and gravel bar features relative to neighboring pool features. The peat-lined stream sites indicate the opposite; greater thaw depths beneath pools and shallower thaw beneath the connecting runs. Results provide detailed 3D geometry of active-layer thaw depths that can support hydrological studies seeking to quantify transport and biogeochemical processes that occur within the hyporheic zone.