气候变化领域集成服务门户(CCPortal): A practical quantification of error sources in regional-scale airborne groundwater salinity mapping

CCPortal

DOI	10.1088/1748-9326/ab7b23
	A practical quantification of error sources in regional-scale airborne groundwater salinity mapping
	King J.; King J.; Oude Essink G.; Oude Essink G.; Karaoulis M.; Bierkens M.F.P.; Bierkens M.F.P.
发表日期	2020
ISSN	17489318
卷号	15 期号:7
英文摘要	Hosting over 10% of the world's population, low elevation (<10 m above mean sea-level) coastal zones are susceptible to saline groundwater intrusion - making fresh groundwater an often scarce and threatened commodity. To inform suitable coastal groundwater management strategies, regional-scale mapping of fresh and saline groundwater occurrence is extremely beneficial. This mapping is usually based on conventional ground-based methods. However, these are not only slow and expensive, but result in localized and disconnected information which is uneconomical and impractical on the larg scales required. Airborne electromagnetic (AEM) surveys have been proven a frugal and rapid way to overcome these shortcomings. Consequently, AEM methods are increasingly being used globally. Little is known about the effects of flightline spacing and additional ground-based data on the quality of mapping results, and in general the accuracy of AEM, other than validation against often sparse ground measurements. Understanding this is therefore invaluable as input to groundwater management strategies, survey planning and decision making. Here, we use a regional scale (900 km2), high-resolution (50 m 50 m 0.5 m) 3D synthetic model of electrical conductivity and geological properties, to investigate the effects of data availability on the accuracy of regional-scale groundwater salinity mapping. This was undertaken by simulating commonly used AEM parameters and realistic data acquisition methods. Two key data components are considered: (1) the AEM survey itself, and (2) geological information used to convert the AEM results into groundwater salinity. Spatially, different data-densities of these two components are quantitatively compared to highlight ideal geometrical configurations for given accuracy requirements. Our results indicate that in terms of optimising costs versus benefits, the value of additional lithological information is dependent on how well the initial distribution of electrical conductivity is resolved by the acquisition and inversion process. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	airborne electromagnetics; flightline spacing; formation factor; geological information; mapping error; regional scale groundwater salinity
语种	英语
scopus关键词	3D modeling; Coastal zones; Data acquisition; Decision making; Electric conductivity; Lithology; Mapping; Sea level; Surveys; Water management; 3-D synthetic models; Airborne electromagnetic; Electrical conductivity; Geological information; Geological properties; Geometrical configurations; Groundwater management; Groundwater salinities; Groundwater; coastal zone; decision making; electromagnetic survey; error analysis; ground-based measurement; groundwater; model validation; quantitative analysis; salinity; water management
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153972
作者单位	Department of Physical Geography, Utrecht University, Utrecht, Netherlands; Unit Subsurface and Groundwater Systems, Deltares Utrecht, Netherlands
推荐引用方式 GB/T 7714	King J.,King J.,Oude Essink G.,et al. A practical quantification of error sources in regional-scale airborne groundwater salinity mapping[J],2020,15(7).
APA	King J..,King J..,Oude Essink G..,Oude Essink G..,Karaoulis M..,...&Bierkens M.F.P..(2020).A practical quantification of error sources in regional-scale airborne groundwater salinity mapping.Environmental Research Letters,15(7).
MLA	King J.,et al."A practical quantification of error sources in regional-scale airborne groundwater salinity mapping".Environmental Research Letters 15.7(2020).