气候变化领域集成服务门户(CCPortal): Salt intrusion dynamics in a well-mixed sub-estuary connected to a partially to well-mixed main estuary

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DOI	10.5194/os-20-181-2024
	Salt intrusion dynamics in a well-mixed sub-estuary connected to a partially to well-mixed main estuary
	Lin, Zhongyuan; Zhang, Guang; Zou, Huazhi; Gong, Wenping
发表日期	2024
ISSN	1812-0784
EISSN	1812-0792
起始页码	20
结束页码	1
卷号	20 期号:1
英文摘要	Salt intrusion in estuaries has been exacerbated by climate change and human activities. Previous studies have primarily focused on salt intrusion in the mainstem of estuaries, whereas those in sub-estuaries (those that branch off their main estuaries) have received less attention. During an extended La Nina event from 2021 to 2022, a sub-estuary (the East River estuary) alongside the Pearl River estuary, China, experienced severe salt intrusions, posing a threat to the freshwater supply in the surrounding area. Observations revealed that maximum salinities in the main estuary typically preceded spring tides, exhibiting significant asymmetry in salinity rise and fall over a fortnightly timescale. In contrast, in the upstream region of the sub-estuary, the variation in salinity was in phase with that of the tidal range, and the rise and fall of the salinity were more symmetrical.Inspired by these observations, we employed idealized numerical models and analytical solutions to investigate the underlying physics behind these behaviors. It was discovered that under normal dry conditions (with a river discharge of 1500 m 3 s - 1 at the head of the main estuary), the river-tide interaction and change in horizontal dispersion accounted for the in-phase relationship between the salinity and tidal range in the upstream region of the sub-estuary. Under extremely dry conditions (i.e., a river discharge of 500 m 3 s - 1 at the head of the main estuary), salinity variations were in phase with those of the tidal range in the middle as well as the upstream region of the sub-estuary. The variation in salinity in the main estuary along with those in salt dispersion and freshwater influx inside the sub-estuary collectively influenced salinity variation in the well-mixed sub-estuary. These findings have important implications for water resource management and salt intrusion prevention in the catchment area.
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences ; Oceanography
WOS类目	Meteorology & Atmospheric Sciences ; Oceanography
WOS记录号	WOS:001190493900001
来源期刊	OCEAN SCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/302122
作者单位	Sun Yat Sen University; Sun Yat Sen University
推荐引用方式 GB/T 7714	Lin, Zhongyuan,Zhang, Guang,Zou, Huazhi,et al. Salt intrusion dynamics in a well-mixed sub-estuary connected to a partially to well-mixed main estuary[J],2024,20(1).
APA	Lin, Zhongyuan,Zhang, Guang,Zou, Huazhi,&Gong, Wenping.(2024).Salt intrusion dynamics in a well-mixed sub-estuary connected to a partially to well-mixed main estuary.OCEAN SCIENCE,20(1).
MLA	Lin, Zhongyuan,et al."Salt intrusion dynamics in a well-mixed sub-estuary connected to a partially to well-mixed main estuary".OCEAN SCIENCE 20.1(2024).