气候变化领域集成服务门户(CCPortal): Impacts of groundwater dynamics around a macro-tidal river on agricultural soil salinity

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DOI	10.1016/j.scitotenv.2024.172344
	Impacts of groundwater dynamics around a macro-tidal river on agricultural soil salinity
	Tackley, Hayden A.; Kurylyk, Barret L.; Lake, Craig B.
发表日期	2024
ISSN	0048-9697
EISSN	1879-1026
起始页码	927
卷号	927
英文摘要	Estuaries are vulnerable to oceanic and atmospheric climate change. Much of the research investigating climate change impacts on estuaries is focused on saltwater intrusion within surface water due to drought and rising sea levels, with implications for ecosystems and humans. Groundwater and soil near estuaries may also be influenced, as estuary salinity and hydraulic head changes can impact soils and aquifers not previously at risk of salinization. This study was conducted to address knowledge gaps related to present and future groundwater salinity distribution in a groundwater system connected to a macro-tidal estuary. The studied estuary experiences a tidal bore due to its hydraulic connection to the Bay of Fundy in Nova Scotia, Canada. A parcel of agricultural land adjacent to the estuary was selected to assess the groundwater response to episodic fluctuations in estuary water levels and salinity. Groundwater monitoring and electromagnetic surveys were conducted to map soil and groundwater salinity patterns. A numerical model of groundwater flow and solute transport informed by field data was used to investigate how varying estuary salinity due to droughts and sea-level rise could impact groundwater salinity. Results showed that, in contrast to salt wedges observed along marine coasts, the saline groundwater existed as a plume immediately around the estuary. Model simulations showed that short-term droughts had an insignificant impact on the adjacent groundwater salinity. However, permanent increases in salinity caused by sea-level rise increased the plume volume by 86 %, or an additional similar to 11 m horizontally and similar to 4.5 m vertically. Our results suggest that increased river salinity in this setting would not result in widespread salinization of porewater and agricultural soils, but more extensive salinization may be experienced in permeable aquifers or along more saline estuarine zones. Findings may inform land management decisions in regions exposed to increased salinity in the future.
英文关键词	Saltwater intrusion; Estuary; River salinization; Agriculture; Soil salinity; Climate change
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:001232549600001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/309406
作者单位	Dalhousie University
推荐引用方式 GB/T 7714	Tackley, Hayden A.,Kurylyk, Barret L.,Lake, Craig B.. Impacts of groundwater dynamics around a macro-tidal river on agricultural soil salinity[J],2024,927.
APA	Tackley, Hayden A.,Kurylyk, Barret L.,&Lake, Craig B..(2024).Impacts of groundwater dynamics around a macro-tidal river on agricultural soil salinity.SCIENCE OF THE TOTAL ENVIRONMENT,927.
MLA	Tackley, Hayden A.,et al."Impacts of groundwater dynamics around a macro-tidal river on agricultural soil salinity".SCIENCE OF THE TOTAL ENVIRONMENT 927(2024).