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

doi:10.3390/w14172717

CORC > 烟台海岸带研究所 > 中国科学院烟台海岸带研究所 > 中科院海岸带环境过程与生态修复重点实验室

	Morpho-Sedimentary Constraints in the Groundwater Dynamics of Low-Lying Coastal Area: The Southern Margin of the Venice Lagoon, Italy
	Cavallina, Chiara 3; Bergamasco, Alessandro 2; Cosma, Marta 3; Da Lio, Cristina 3; Donnici, Sandra 3; Tang, Cheng 1; Tosi, Luigi 3; Zaggia, Luca 3
刊名	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.
资助项目	EU ; Interreg Italy-Croatia CBC Programme 2014-2020 (Priority Axes: Safety and Resilience) through the European Regional Development Fund as a part of the project Monitoring seawater intrusion in coastal aquifers and Testing pilot projects for its mitigation ([AID: 10047743] ; National Research Council of Italy ; Chinese Academy of Sciences
WOS关键词	SEA-LEVEL RISE ; LATE PLEISTOCENE ; HETEROGENEITY ; CONTAMINATION ; SUBSURFACE ; RESERVOIR ; AQUIFERS ; IMPACT
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
语种	英语
出版者	MDPI
WOS记录号	WOS:000851799300001
内容类型	期刊论文
源URL	[http://ir.yic.ac.cn/handle/133337/31690]
专题	烟台海岸带研究所_中科院海岸带环境过程与生态修复重点实验室
通讯作者	Cavallina, Chiara
作者单位	1.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China 2.CNR, Inst Marine Sci, I-30122 Venice, Italy 3.CNR, Inst Geosci & Earth Resources, I-35131 Padua, Italy
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.