干旱区生态环境知识资源中心(Arid): Investigating the impact of artificial environmental watering on a semi-arid, highly saline floodplain using electromagnetics and surface nuclear magnetic resonance

Arid

DOI	10.1002/hyp.13732
	Investigating the impact of artificial environmental watering on a semi-arid, highly saline floodplain using electromagnetics and surface nuclear magnetic resonance
	Li, Chris 1,2; Doble, Rebecca 1; Hatch, Michael 2; Heinson, Graham 2
通讯作者	Li, Chris
来源期刊	HYDROLOGICAL PROCESSES
ISSN	0885-6087
EISSN	1099-1085
出版年	2020
卷号	34 期号:11 页码:2337-2350
英文摘要	Floodplains have ecological and cultural significance and need to be managed properly. However, floodplains along the River Murray in South Australia are showing a substantial vegetation health decline due to increased salinization. To improve floodplain health, water resource managers are experimenting with the delivery of fresh water to the high priority floodplains. However, the salinity impact of watering on the shallow, saline groundwater is not well understood due to the presence of a spatially variable and impermeable surface clay layer. This study uses time-domain electromagnetics (EM) and surface nuclear magnetic resonance (NMR) to assess the impact of watering on groundwater salinity in a South Australian River Murray floodplain. We examined the changes in bulk electrical conductivity (EC) from time-domain EM data collected at five sites before and after a watering event. Only one site showed a bulk EC reduction of up to 5,200 mu S/cm, suggesting groundwater was freshened, whilst the remaining sites showed little change in bulk EC. Our results suggest the salinity impact of watering is highly localized and heterogeneous. For ecological management purposes, it is also desirable to estimate groundwater EC after watering. This study presents a method to estimate groundwater EC in a highly conductive environment by coupling EM with surface NMR. We also extended the analysis to an airborne-EM survey to derive spatial distribution of groundwater EC, which provides additional insights into the floodplain processes and shows an overall good agreement with field observations. This study demonstrates the potential benefits of using geophysics to investigate floodplain dynamics. The methodology developed in this study is useful for first-pass assessments of groundwater quality in a non-invasive manner, which is transferrable to many other fresh or saline groundwater systems, especially in ecologically sensitive areas where traditional hydrogeological techniques may be unsuitable due to the potential disturbance of local ecosystems.
英文关键词	electromagnetics environmental watering floodplain geophysics groundwater hydrogeology nuclear magnetic resonance salinity
类型	Article
语种	英语
国家	Australia
收录类别	SCI-E
WOS记录号	WOS:000517496700001
WOS关键词	RIVER MURRAY ; HYDRAULIC CONDUCTIVITY ; DEAD-TIME ; GROUNDWATER ; NMR ; MANAGEMENT ; INVERSION ; TRANSPORT ; AID
WOS类目	Water Resources
WOS研究方向	Water Resources
来源机构	Commonwealth Scientific and Industrial Research Organisation
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314689
作者单位	1.CSIRO Land & Water, Glen Osmond, SA, Australia; 2.Univ Adelaide, Sch Phys Sci, Adelaide, SA, Australia
推荐引用方式 GB/T 7714	Li, Chris,Doble, Rebecca,Hatch, Michael,et al. Investigating the impact of artificial environmental watering on a semi-arid, highly saline floodplain using electromagnetics and surface nuclear magnetic resonance[J]. Commonwealth Scientific and Industrial Research Organisation,2020,34(11):2337-2350.
APA	Li, Chris,Doble, Rebecca,Hatch, Michael,&Heinson, Graham.(2020).Investigating the impact of artificial environmental watering on a semi-arid, highly saline floodplain using electromagnetics and surface nuclear magnetic resonance.HYDROLOGICAL PROCESSES,34(11),2337-2350.
MLA	Li, Chris,et al."Investigating the impact of artificial environmental watering on a semi-arid, highly saline floodplain using electromagnetics and surface nuclear magnetic resonance".HYDROLOGICAL PROCESSES 34.11(2020):2337-2350.