Morpho-Sedimentary Constraints in the Groundwater Dynamics of Low-Lying Coastal Area: The Southern Margin of the Venice Lagoon, Italy

doi:10.3390/w14172717

	Morpho-Sedimentary Constraints in the Groundwater Dynamics of Low-Lying Coastal Area: The Southern Margin of the Venice Lagoon, Italy
	Cavallina, Chiara 1; Bergamasco, Alessandro 2; Cosma, Marta 1; Da Lio, Cristina 1; Donnici, Sandra 1; Tang, Cheng3 ; Tosi, Luigi 1; Zaggia, Luca 1
发表期刊	WATER
	2022-09-01
卷号	14 期号:17 页码:24
关键词	salt-water intrusion groundwater dynamics coastal plain
DOI	10.3390/w14172717
英文摘要	Complex freshwater-saltwater exchanges characterize most Holocene groundwater aquifers in low-lying coastal plains around the world, particularly in mechanically drained territories. This is due to the combination of several factors that control groundwater dynamics, including the high variability of the Holocene coastal deposits that host the shallow aquifers and the water management practices. The relationships between the stratal architecture of sedimentary deposits and the vertical changes in the salinity of the phreatic aquifer are poorly studied although they represent an issue of primary importance for a sustainable use of water resources and for agriculture. This research work is focused on the influence of sedimentary constraints, i.e., stratigraphic discontinuities and related changes in permeability in shaping salinity stratification into the unconfined aquifer at the southern margin of the Venice lagoon (Italy). Nine sites have been investigated by collecting sediment cores for facies analysis and monitoring water electrical conductivity in piezometric wells. The results show that buried channelized sandy deposits can enhance salinity mitigation of the phreatic aquifer in conjunction with precipitations and sufficient freshwater supply from nearby rivers and irrigation channels. Our analyses also reveal that the differences in stratigraphic architecture of the upper 10 m of the subsoil determine different fresh-saltwater dynamics of the phreatic aquifer. In particular, three possible behaviors can occur: (i) where the subsurface is characterized by the presence of a thick, up to 5 m, paleochannel, a freshwater lens is always present in the most surficial part of the phreatic aquifer; (ii) where the subsurface is composed by fine-grained sediments of marsh and lagoon paleo-environment, the phreatic aquifer tends to be salt-contaminated over its entire thickness; (iii) where the subsurface contains thin, up to 2-3 m, paleochannel deposits, the fresh-saltwater dynamics of the most surficial part of the phreatic aquifer varies more during the year, as a result of seasonal precipitation trend. The provided characterization of saltwater dynamics represents the basis for planning mitigation measures to improve the farmland productivity of the Venetian coastal plains.
收录类别	SCI
语种	英语
关键词[WOS]	SEA-LEVEL RISE ; LATE PLEISTOCENE ; HETEROGENEITY ; CONTAMINATION ; SUBSURFACE ; RESERVOIR ; AQUIFERS ; IMPACT
研究领域[WOS]	Environmental Sciences & Ecology ; Water Resources
WOS记录号	WOS:000851799300001
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/37358
专题	中国科学院海岸带环境过程与生态修复重点实验室中国科学院海岸带环境过程与生态修复重点实验室_海岸带信息集成与战略规划研究中心
通讯作者	Cavallina, Chiara
作者单位	1.CNR, Inst Geosci & Earth Resources, I-35131 Padua, Italy 2.CNR, Inst Marine Sci, I-30122 Venice, Italy 3.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China
推荐引用方式 GB/T 7714	Cavallina, Chiara,Bergamasco, Alessandro,Cosma, Marta,et al. Morpho-Sedimentary Constraints in the Groundwater Dynamics of Low-Lying Coastal Area: The Southern Margin of the Venice Lagoon, Italy[J]. WATER,2022,14(17):24.
APA	Cavallina, Chiara.,Bergamasco, Alessandro.,Cosma, Marta.,Da Lio, Cristina.,Donnici, Sandra.,...&Zaggia, Luca.(2022).Morpho-Sedimentary Constraints in the Groundwater Dynamics of Low-Lying Coastal Area: The Southern Margin of the Venice Lagoon, Italy.WATER,14(17),24.
MLA	Cavallina, Chiara,et al."Morpho-Sedimentary Constraints in the Groundwater Dynamics of Low-Lying Coastal Area: The Southern Margin of the Venice Lagoon, Italy".WATER 14.17(2022):24.