Geophysical and Hydrogeological Studies in a Coastal Plain Affected by Salt Water Intrusion

Ardau, F.; Balia, Roberto; Barbieri, Giulio; Barrocu, Giovanni; Gavaudo, E.; Ghiglieri, Giorgio; Vernier, Antonio

doi:10.4133/1.2922748

Cited by 3 publications

(3 citation statements)

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“…Geophysical methods used in exploration include: i) Seismic methods are a group of methods that use seismic waves or sound waves to study the environment. The results of the exploration are the location of reflection/refraction boundaries, the speed of wave propagation in rock (or water) masses, and possibly the physical and mechanical structural characteristics of the rock and soil [1]; ii) Gravity method measures the Earth's gravity, thereby determining the density distribution (or density) of rock masses [2]; iii) Magnetic method to measure the Earth's magnetic field [3]; iv) Electrical methods are a system of methods that use voltage or constant current (DC) to study the environment through electrodes inserted into the ground, to determine the distribution of electrical conductivity characteristics of blocks or rock layer [4]; v) Electromagnetic methods are a system of methods that use electromagnetic fields to study the environment, and usually do not use electrodes. The survey results are the conductivity distribution in soil and rock, but are often expressed in resistivity [5]; vi) Radioactive exploration includes methods for characterizing and distributing natural or forced radiation in rocks and soil [6]; vii) Geothermal exploration: Measure temperature distribution in soil and rock to determine the heat source and rock state properties [7]; viii) Seismoelectrical: Research and application of electromagnetic fields generated in soil and rock under the impact of compressive elastic waves (longitudinal P waves) to predict nearby earthquakes, search and explore underground water or potentially valuable minerals.…”

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confidence: 99%

Risk of groundwater pollution and proposals for sustainable development in Binh Thuan province, Vietnam

Phu,

Thi Minh Ha

2024

JHM

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Groundwater serves as one of the important sources of water supply for Binh Thuan province, Vietnam during dry seasons. This water source is concentrated in Quaternary sediments with two aquifers qh and qp. Geophysical methods have been applied, performing geological drilling, observing and monitoring boreholes. Determine the characteristics of the qh and qp aquifers, located along the coast of Binh Thuan province. Our research has shown that these reservoirs are contaminated. Water sources are at high risk of being contaminated with mineral oil, radioactive, organic, bacterial and saline contamination. The article warned about water resource risks in Binh Thuan province and proposed remedial measures to ensure water resources for Binh Thuan province.

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Section: Introductionmentioning

confidence: 99%

Risk of groundwater pollution and proposals for sustainable development in Binh Thuan province, Vietnam

Phu,

Thi Minh Ha

2024

JHM

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“…In this context, the development of an integrated and sustainable groundwater management system is crucial to satisfy human demand for water, both for drinking and irrigation purposes, while respecting the environmental equilibrium. Due to the geological complexity of the plain and the intrusion of seawater, numerous hydrogeological, geological, and geophysical studies have been carried out since 1970 [18][19][20][21][22][23][24][25][26][27]. Despite the large number of investigations, many aspects remain unclear.…”

Section: Introductionmentioning

confidence: 99%

“…Through a multidisciplinary approach, this work aims to provide a methodology to Due to the geological complexity of the plain and the intrusion of seawater, numerous hydrogeological, geological, and geophysical studies have been carried out since 1970 [18][19][20][21][22][23][24][25][26][27]. Despite the large number of investigations, many aspects remain unclear.…”

Section: Introductionmentioning

confidence: 99%

Assessing Recharge Sources and Seawater Intrusion in Coastal Groundwater: A Hydrogeological and Multi-Isotopic Approach

Porru,

Arras,

Biddau

et al. 2024

Water

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One of the crucial challenges of our time is climate change. The consequences of rising sea levels and drought greatly impact water resources, potentially worsening seawater intrusion. Characterizing coastal aquifers is an essential step in devising strategies to address these phenomena. Seawater intrusion poses a critical socio-economic and environmental issue in the coastal plain of Muravera, southeastern Sardinia (Italy). This coastal plain is an important agricultural area in Sardinia, and the health of the crops is compromised by the increasing salinization of shallow groundwater. To enhance our understanding of the hydrogeological conceptual model, which is essential for a sustainable resource management system, hydrogeological investigations were conducted and complemented by the chemical and multi-isotopic analyses of groundwater. The main objectives of this study were to identify groundwater recharge areas, understand salinization mechanisms and trace the evolution of water chemistry. Within this framework, a monthly survey monitoring piezometric level and electrical conductivity was carried out for one year. This survey was integrated with chemical and isotope analyses, including δ18OH2O and δ2HH2O, δ11B, δ18OSO4, δ34SSO4, and 87Sr/86Sr. Hydrochemistry analysis results revealed the occurrence of seawater–freshwater mixing, extending up to 4 km inland. H2O isotope analysis confirmed the mixing processes and indicated the meteoric origin of recharge waters for both shallow and semi-confined aquifers. The strontium isotopes ratio facilitated the identification of four main groundwater flow paths, confirmed by the SIAR model. The results of this combined hydrogeological–geochemical–isotopic survey provide essential elements for the future implementation of an integrated and sustainable management system. These findings enable interventions to slow the process of seawater intrusion and meet the economic needs for the development of local communities.

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Geophysical approach to the environmental study of a coastal plain

et al. 2003

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in the study of coastal plains affected by soil and water salination, a knowledge of several geological aspects, such as structural features, depth to basement, stratigraphy of sedimentary cover, relationships between the phreatic aquifer and underlying aquifers, and the latter's structure, is basic to gaining an adequate understanding of both the causes and possible evolution of salination. In this framework, geophysical techniques can play a very important role. \ud \ud To improve the available geophysical information about the Muravera coastal plain, Sardinia, Italy, which is affected by severe soil and water salination, previously acquired electrical resistivity, reflection seismic and gravity data have been reprocessed, and a new seismic reflection survey has been conducted. Moreover, in order to give better support to the geological and hydrogeological interpretation of geophysical data, three boreholes were drilled. Reprocessed electrical data indicate the presence of a wide, electrically homogeneous low-resistivity zone associated with salination phenomena. Reprocessed reflection data provide useful information on the near-surface stratigraphy. The combined interpretation of resistivity and seismic results, supported by one calibration borehole, elucidates the relationships between the phreatic aquifer and the underlying confined aquifer. A new seismic reflection survey gives information on the depth to, and structure of, the Paleozoic basement, as well as on stratigraphic conditions of Pleistocene-Holocene sediments. Finally, the combined interpretation of seismic, gravity, and well data results in a geological section containing most of the information considered essential, such as the interface between Holocene alluvium and Pleistocene alluvium, the thickness of the latter, and the structure and composition of the Paleozoic basement. \ud \ud The work as a whole shows how the combined application of geophysical techniques can in this specific situation provide wide-ranging and high-quality information that is essential for the realistic mathematical modeling of aquifer contamination, and can enable the rational planning of exploratory drillings

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Geophysical and Hydrogeological Studies in a Coastal Plain Affected by Salt Water Intrusion

Cited by 3 publications

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Risk of groundwater pollution and proposals for sustainable development in Binh Thuan province, Vietnam

Risk of groundwater pollution and proposals for sustainable development in Binh Thuan province, Vietnam

Assessing Recharge Sources and Seawater Intrusion in Coastal Groundwater: A Hydrogeological and Multi-Isotopic Approach

Geophysical approach to the environmental study of a coastal plain

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