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What is seawater intrusion?

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Seawater intrusion refers to the infiltration of seawater into groundwater, impacting various aspects like health, soil fertility, and groundwater quality. It is a significant environmental issue caused by the decline of fresh water levels, leading to seawater contaminating underground freshwater sources. This phenomenon is particularly concerning in areas with high porosity rocks, like alluvial plains, making them vulnerable to seawater intrusion. Studies have shown that seawater intrusion can be detected through various analytical techniques, such as multivariate statistical analyses and ionic ratios, highlighting the presence of seawater in different groundwater zones. Numerical simulation models are also utilized to predict the future extent of seawater intrusion, aiding in effective management and prevention strategies.

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Open access•Posted Content•DOI Stochastic simulation of seawater intrusion in Longkou area, China 09 May 2022	Seawater intrusion is the infiltration of seawater into groundwater, causing pollution. The study predicts gradual aggravation in Longkou, China, estimating 67.45 to 77.07 km2 intrusion after 30 years.
Journal Article•DOI Identification of Seawater Intrusion in the Dibdibba Coastal Aquifer, South of Iraq Using Chemical Indicators and Multivariate Analyses Lamees S. Al-Qurnawy, Inass Abdal Razaq Almallah, Aymen Alrubaye - Show less +2 more 01 Jul 2023	Seawater intrusion is the infiltration of seawater into groundwater, impacting aquifers. This study in southern Iraq used chemical indicators and multivariate analyses to detect and analyze seawater intrusion.
Open access•Journal Article•DOI Identification of seawater intrusion using geophysical methods in the mandalika, lombok, indonesia Alfina Taurida Alaydrus 01 Sep 2022-International Journal of Geomate	Seawater intrusion is the infiltration of seawater into aquifers, often due to high-porosity rocks like alluvium. It was identified in Mandalika, Lombok, Indonesia using geophysical methods.
Open access•Journal Article•DOI Assessing seawater intrusion and chloride zones in residents' wells in selected coastal area of Indonesia: A GIS analysis Nurmaladewi Nurmaladewi, La Ode Ahmad Saktiansyah, Yoenita Jayadisastra, Andini Sulfitrana, Ali Okto - Show less +4 more 23 Jun 2023-Public Health of Indonesia	Seawater intrusion is the infiltration of seawater into groundwater, impacting water quality in coastal areas. The study found low-level seawater intrusion in Kendari District, Indonesia.
Book Chapter•DOI Numerical simulation of seawater intrusion in typical area based on FEFLOW 22 Feb 2023	Seawater intrusion is the infiltration of seawater into underground freshwater layers due to declining freshwater levels, causing environmental geological issues. It can be simulated and managed using groundwater numerical models.

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Related Questions

How does saltwater intrusion affect the growth and yield of rice crops in Taytay?5 answersSaltwater intrusion has a negative impact on the growth and yield of rice crops in Taytay. The presence of salt in the soil and irrigation water leads to decreased plant height, reduced relative water content of leaves, lower number of effective tillers per hill, decreased number of filled grains per panicle, reduced 1000-grain weight, and lower grain yield. The extent of yield reduction varies depending on the salinity level, with higher salinity levels resulting in greater yield losses. Different rice varieties also exhibit varying levels of tolerance to salt stress, with salt-tolerant varieties showing better growth and yield performance under salt stress conditions. Saline intrusion affects the growth stages of rice, leading to impaired rice growth rates and lower rice productivity.

How saline water intrusion effects construction materials?5 answersSaline water intrusion can have significant effects on construction materials. It can lead to soil salinity and sodicity, affecting soil structural stability and reducing saturated hydraulic conductivity. Saltwater intrusion into freshwater aquifers can contaminate groundwater resources and alter the hydraulic conductivity of aquifer materials, impacting coastal groundwater flow. Concrete structures can be damaged by physical salt attack from sodium sulfate exposure, even with low water to cementitious materials ratio and use of supplementary cementitious materials. Salt crystallization in porous building materials can cause damage, affecting crystal distribution, pore structures, and capillary absorption behaviors. The use of saline underground water in cemented fine tailings backfill can have both negative and positive effects on the strength development of the backfill, depending on the curing time.

SEAWAT Modeling climate change effects on seawater intrusion in saudi arabia?5 answersSeawater intrusion in Saudi Arabia's coastal regions, particularly in arid areas, is a significant threat to fresh groundwater resources. The impact of climate change, including sea level rise and global warming, on the Red Sea coast of Saudi Arabia has been studied. Groundwater quality in the Al Qunfudhah region along the Red Sea coast has been affected by seawater intrusion and heavy metals contamination. The Jorf shallow aquifer in Tunisia, located on the Mediterranean Sea, is also facing the problem of marine intrusion. The impact of sea level rise on the coastal areas of Bahrain's islands has been assessed, indicating high vulnerability and potential loss of land area. However, there is no specific mention of SEAWAT modeling in the abstracts provided.

What is the best barrier for seawater intrusion physical or hydraulic?5 answersThe best barrier for seawater intrusion depends on the specific conditions and goals of the coastal area. Physical barriers, such as mixed physical barriers (MPB) and subsurface dams, have been shown to be effective in preventing and controlling seawater intrusion (SWI). MPB has been found to have higher efficiency in SWI control compared to conventional subsurface dams and cutoff walls. However, the construction of MPB may lead to the accumulation of nitrate contaminants in coastal aquifers. On the other hand, hydraulic barriers, such as mixed hydraulic barriers, have shown promising advantages for remediation of seawater intrusion in coastal aquifers. The optimal barrier choice depends on factors such as barrier location, hydraulic gradient, and aquifer conditions. Therefore, the selection of the best barrier should consider the specific conditions and goals of the coastal area, as well as the potential impacts on nitrate accumulation and groundwater resources.

What is the impact of sea level rise on seawater intrusion in the eastern province of Saudi Arabia?5 answersSea level rise in the eastern province of Saudi Arabia has a significant impact on seawater intrusion. The rise in sea level leads to the contamination of shallow groundwater with seawater, resulting in increased salinity levels in the coastal aquifers. The intrusion of seawater is observed up to a distance of 4 km inland, with a maximum depth of 30 m. The increase in seawater intrusion is associated with higher salinity, sodium, and magnesium levels in the groundwater. The shallow groundwater located close to the shoreline is more affected by seawater intrusion compared to the deep groundwater. The contamination of groundwater with seawater poses a threat to the availability of freshwater resources for coastal communities. Proper management measures, such as reducing groundwater abstraction and implementing coastal zone management plans, are recommended to mitigate seawater intrusion and protect freshwater resources.

What is seawater intrusion?3 answersSeawater intrusion refers to the process of seawater entering and infiltrating into land, particularly in coastal regions. It is a significant environmental problem that threatens the quality and sustainability of fresh groundwater resources in coastal aquifers. Factors such as excessive pumping of groundwater, lack of natural recharge, and climate variations contribute to the exacerbation of seawater intrusion. Seawater intrusion can have adverse effects on groundwater, which is a crucial source of water supply for domestic, agricultural, and industrial usage. It is important to implement appropriate management strategies to control and reduce the impacts of seawater intrusion in coastal aquifers. The phenomenon of post-pumping seawater intrusion (PP-SWI) has also been identified, where seawater intrudes further inland than the location of a well after pumping has ceased. Understanding the relationship between hydrogeological parameters, extraction rates, well location, and seawater intrusion is essential for effective management and prevention of seawater intrusion.

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