Impact of projected climate change on seawater intrusion on a regional coastal aquifer

Sithara, S.; Pramada, S. K.; Thampi, Santosh G.

doi:10.1007/s12040-020-01485-y

Cited by 11 publications

(3 citation statements)

References 28 publications

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“…Coastal waters can be overloaded with terrestrial nutrients and chemical, biological and physical pollutants, toxins and pathogens (Cooley et al, 2022). While the salinities of many estuaries, deltas, aquifers and soils are increasing, decreasing water quality is endangering human health, agricultural yields (Rakib et al, 2020;Mastrocicco and Colombani, 2021) and drinking water availability (Sithara et al, 2020;Wang and Hong, 2021) which depend heavily on regional variations in environment and human behaviour (Paldor and Michael, 2021). Water security is also threatened by various direct anthropogenic interventions that degrade coastal ecosystems, such as cutting mangroves, overexploitation of groundwater and pollution, resulting in poverty, tensions and instability (Babuna et al, 2023).…”

Section: Water Food and Fisheriesmentioning

confidence: 99%

Climate change and human security in coastal regions

Petzold,

Scheffran

2024

Camb. prisms Coast. futures

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Climate change has been recognised as a major concern in coastal hotspots exposed to multiple climate hazards under regionally specific characteristics of vulnerability. We review the emerging research and current trends in the academic literature on coastal climate risk and adaptation from a human security perspective. The ecological and socioeconomic developments are analysed for key risk areas, including coastal infrastructure; water, food and fisheries; health; human mobility; and conflict, taking the different geographical contexts of coastal areas in islands, megacities and deltas into consideration. Compounding and cascading interactions require integrative research and policy approaches to address the growing complexity. Governance mechanisms focus on coastal management and adaptation, nature-based solutions and community-based adaptation, considering their synergies and trade-offs. This perspective allows for a holistic view on climate risks to human security and vicious circles of societal instability in coastal systems and the interconnectedness of different risk dimensions and systems necessary for sustainable and transformative adaptation solutions for the most affected coastal hotspots.

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Section: Water Food and Fisheriesmentioning

confidence: 99%

Climate change and human security in coastal regions

Petzold,

Scheffran

2024

Camb. prisms Coast. futures

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“…Increasing climate change and human activities on groundwater for irrigation have significant impact on groundwater. The impacts of global climate change on groundwater level (GWL) changes are severe enough to justify more research to improve forecasting and future consequences [6]. It is critical to maintain sustainable groundwater usage, especially in light of urbanisation and a population that is increasingly reliant on groundwater.…”

Section: Introductionmentioning

confidence: 99%

Climate change impact assessment on groundwater level changes: A study of hybrid model techniques

Afrifa

Zhang

Xin

et al. 2023

IET Signal Processing

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One of the most important sources of water supply is groundwater. However, the groundwater level (GWL) is significantly impacted by the global climate change. Therefore, under these more severe climate change conditions, the accurate and simple forecast of farmland GWL is a crucial component of agricultural water management. A hybrid model (HM) of Bayesian random forest (BRF), Bayesian support vector machine (BSVM), and Bayesian artificial neural network (BANN) is built in this study. The HM is made up of a Bayesian model averaging (BMA) and three machine learning models: random forest (RF), support vector machine (SVM), and artificial neural network. These three HMs are employed to help automate logical inference and decision‐making in business intelligence for groundwater management. For this purpose, data on 8 separate climatic factors that impact GWL changes in the study area were acquired. Nine distinct farming communities' GWL change data were utilised as the dependent variables for each model fit (community data). The effectiveness of the HM techniques was assessed using the evaluation metrics of mean absolute error (MAE), coefficient of determination (R2), mean absolute percent error (MAPE), and root mean square error (RMSE). The model fit in Suhum had the greatest performance with the highest accuracy (R2 varied from 0.9051 to 0.9679) and the lowest error scores (RMSE ranged from 0.0653 to 0.0727, and MAE ranged from 0.0121 to 0.0541), according to the models' evaluation results. The BRF delivered the greatest results when compared to the two independent HMs, the BSVM and BANN. Future GWL and climatic variable data may be trained using the trained HM techniques to determine the effects of climate change. Farmers, businesses, and civil society organisations might benefit from continuous monitoring of GWL data and education on climate change to help control and prevent excessive deteriorations of global climate change on GWL.

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“…On the other hand, groundwater salinization may also be influenced by factors such as groundwater evaporation [11], groundwater mixing [12,13], water-rock interactions [14], and human-induced pollution [15,16]. Furthermore, climate change can lead to fluctuations in sea levels, altering the conditions for groundwater recharge in coastal areas, thereby adversely affecting groundwater resources and the environment [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Complexities of Groundwater Salinization in Coastal Environments: Insights from Laizhou Bay’s Eastern Coast, China

Huang,

Ma,

Zhou

2023

Water

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Coastal areas have made substantial contributions to global economic development but are plagued by challenges such as groundwater salinization. Groundwater serves as the primary source for drinking, industrial, and domestic purposes in these coastal areas. Therefore, understanding the causes and processes of groundwater salinization holds paramount significance for effective groundwater management. The coastal area of Laizhou Bay in northern China serves as a quintessential example of such a scenario. With substantial groundwater extraction and severe groundwater salinization issues, it exacerbates the disparity between water-resource supply and demand. Currently, our understanding of the processes and influencing factors related to groundwater salinization in this region remains limited. In this study, employing hydrochemical and stable chlorine isotope analyses on 35 groundwater and seawater samples, an in-depth investigation into the complex mechanisms underlying groundwater salinization in the Quaternary aquifers of the eastern coastal plain of Laizhou Bay was conducted. The test results of the samples indicate that brine and saline groundwater are primarily of the Na-Cl type, exhibiting a hydrochemical composition similar to that of seawater. Brackish groundwater exhibits a diverse hydrochemical composition. The hydrogen and oxygen isotope characteristics of brackish and fresh groundwater resemble atmospheric precipitation, while brine, seawater, and saline groundwater show hydrogen and oxygen isotope depletion. Compared to seawater, brine exhibits significant δ37Cl depletion. The analysis of the test results reveals that the formation of brine aquifers results from a complex interplay of climate change, tectonic movements, and sea–land evolution, involving lagoon development during seawater regression, salt concentration through evaporation, and subsequent water–rock interactions. The genesis of saline groundwater involves a complex interplay of brine–seawater mixing, significant evaporation, and potential input of fresh groundwater from atmospheric precipitation and river sources. The formation of brackish groundwater is predominantly influenced by atmospheric precipitation, and agricultural activities, with significant variations in NO3− concentrations attributed to varying intensities of fertilizer application in the northern plain area. These insights contribute to a deeper understanding of the origins of groundwater and can inform the development of policies for groundwater protection in this area.

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Impact of projected climate change on seawater intrusion on a regional coastal aquifer

Cited by 11 publications

References 28 publications

Climate change and human security in coastal regions

Climate change and human security in coastal regions

Climate change impact assessment on groundwater level changes: A study of hybrid model techniques

Unraveling the Complexities of Groundwater Salinization in Coastal Environments: Insights from Laizhou Bay’s Eastern Coast, China

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