DOI: 10.1016/j.gloplacha.2016.10.010
论文题名: Bathymetric evolution of Tasman Glacier terminal lake, New Zealand, as determined by remote surveying techniques
作者: Purdie H. ; Bealing P. ; Tidey E. ; Gomez C. ; Harrison J.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 147 起始页码: 1
结束页码: 11
语种: 英语
Scopus关键词: Bathymetry
; Boat equipment
; Boats
; Digital storage
; Lakes
; Remote control
; Sea ice
; Surveys
; Dual frequency
; Fish finders
; In-situ data
; Knowledge gaps
; Structure from motion
; Subglacial hydrology
; Terminal lakes
; Water depth
; Fighter aircraft
英文摘要: Processes that drive iceberg calving at the margins of freshwater terminating glaciers are still poorly understood. This knowledge-gap is in part due to the challenge of obtaining good in situ data in a highly dynamic and dangerous environment. We are using emerging remote technologies, in the form of a remote controlled jet boat to survey bathymetry, and Structure from Motion (SfM) to characterize terminus morphology, to better understand relationships between lake growth and terminus evolution. Comparison of results between the jet boat mounted dual-frequency Garmin fish-finder with an Odom Echotrac DF3200 MKII with 200/38 kHz dual-frequency transducer, showed that after a sound velocity adjustment, the remote survey obtained depth data within ± 1 m of the higher grade survey equipment. Water depths of up to 240 m were recorded only 100 m away from the terminus, and subaerial cliff height ranged from around 6 to 33 m, with the central region of the terminus more likely to experience buoyancy. Subaqueous ice ramps are ephemeral features, and in 2015 multiple ice ramps extended out into the lake from the terminus by 100–200 m. The consistent location of some of the subaqueous ramps between surveys may indicate that other processes, for example, subglacial hydrology, also influence evolving terminus morphology. © 2016 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84992562787&doi=10.1016%2fj.gloplacha.2016.10.010&partnerID=40&md5=6d515502f934ccdd57d393b19e3e01a7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11593
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Department of Geography, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
Recommended Citation:
Purdie H.,Bealing P.,Tidey E.,et al. Bathymetric evolution of Tasman Glacier terminal lake, New Zealand, as determined by remote surveying techniques[J]. Global and Planetary Change,2016-01-01,147.