Knowledge Resource Center for Ecological Environment in Arid Area
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, Chris1,2; Doble, Rebecca1; Hatch, Michael2; Heinson, Graham2 | |
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. |
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