气候变化领域集成服务门户(CCPortal): Pressure and inertia sensing drifters for glacial hydrology flow path measurements

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DOI	10.5194/tc-14-1009-2020
	Pressure and inertia sensing drifters for glacial hydrology flow path measurements
	Alexander A.; Kruusmaa M.; Tuhtan J.A.; Hodson A.J.; Schuler T.V.; Kääb A.
发表日期	2020
ISSN	19940416
起始页码	1009
结束页码	1023
卷号	14 期号:3
英文摘要	Glacial hydrology plays an important role in the control of glacier dynamics, of sediment transport, and of fjord and proglacial ecosystems. Surface meltwater drains through glaciers via supraglacial, englacial and subglacial systems. Due to challenging field conditions, the processes driving surface processes in glacial hydrology remain sparsely studied. Recently, sensing drifters have shown promise in river, coastal and oceanographic studies. However, practical experience with drifters in glacial hydrology remains limited. Before drifters can be used as general tools in glacial studies, it is necessary to quantify the variability of their measurements. To address this, we conducted repeated field experiments in a 450m long supraglacial channel with small cylindrical drifters equipped with pressure, magnetometer, acceleration and rotation rate sensors and compared the results. The experiments (n = 55) in the supraglacial channel show that the pressure sensors consistently yielded the most accurate data, where values remained within ±0:11% of the total pressure time-averaged mean (95% confidence interval). Magnetometer readings also exhibited low variability across deployments, maintaining readings within ±2:45% of the time-averaged mean of the magnetometer magnitudes. Linear acceleration measurements were found to have a substantially higher variability of ±34:4% of the time-averaged mean magnitude, and the calculated speeds remained within ±24:5% of the timeaveraged mean along the flow path. Furthermore, our results indicate that prominent shapes in the sensor records are likely to be linked to variations in channel morphology and the associated flow field. Our results show that multimodal drifters can be a useful tool for field measurements inside supraglacial channels. Future deployments of drifters into englacial and subglacial channels promise new opportunities for determining hydraulic and morphologic conditions from repeated measurements of such inaccessible environments. © Author(s) 2020.
英文关键词	channel hydraulics; channel morphology; flow field; glacial hydrology; glacier dynamics; inertia; magnetometer; meltwater
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202013
作者单位	Department of Geosciences, University of Oslo, Oslo, 0316, Norway; Department of Arctic Geology, University Centre in Svalbard, Longyearbyen, 9171, Norway; Centre for Biorobotics, Tallinn University of Technology, Tallinn, 12618, Estonia; Centre for Autonomous Marine Operations and Systems, Norwegian University of Science and Technology, Trondheim, 7491, Norway; Department of Environmental Sciences, Western Norway University of Applied Sciences, Sogndal, 6856, Norway; Department of Arctic Geophysics, University Centre in Svalbard, Longyearbyen, 9171, Norway
推荐引用方式 GB/T 7714	Alexander A.,Kruusmaa M.,Tuhtan J.A.,et al. Pressure and inertia sensing drifters for glacial hydrology flow path measurements[J],2020,14(3).
APA	Alexander A.,Kruusmaa M.,Tuhtan J.A.,Hodson A.J.,Schuler T.V.,&Kääb A..(2020).Pressure and inertia sensing drifters for glacial hydrology flow path measurements.Cryosphere,14(3).
MLA	Alexander A.,et al."Pressure and inertia sensing drifters for glacial hydrology flow path measurements".Cryosphere 14.3(2020).