Spatio-temporal variations of nitrate pollution of groundwater in the intensive agricultural region: Hotspots and driving forces

Zhu, Xueqiang; Miao, Peng Cheng; Qin, Jinzhou; Li, Wanhong; Wang, L.; Chen, Zhujun; Zhou, Jianbin

doi:10.1016/j.jhydrol.2023.129864

Cited by 18 publications

(3 citation statements)

References 47 publications

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“…Adopting new approaches, namely critical sampling, was tested within this study. This concept follows the current trend of global interest in research techniques to control the dynamics of groundwater pollution [44]. The assessment of groundwater quality and quantity variations is essential for groundwater management and protection [45]; however, the creation of a large database and the application of different methodological approaches make the analysis costly [46].…”

Section: Discussionmentioning

confidence: 99%

Application of Judgmental Sampling Approach for the Monitoring of Groundwater Quality and Quantity Evolution in Mediterranean Catchments

Ntona,

Chalikakis,

Busico

et al. 2023

Water

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Groundwater monitoring is critically important, even though it is costly and often neglected. In this study, a judgmental monitoring of groundwater offering solutions based on a cost and time-effective research approach is presented. The method was performed in three Mediterranean areas in Greece and Italy to examine its advantages and disadvantages. As a first step, a multi-statistical analysis was practiced to assess and apportion the potential contributions of pollution sources of groundwater. Pearson correlation, principal component analysis, and factor analysis were applied to groundwater samples to characterize the evolution of hydrochemical processes. High concentrations of chlorides and nitrates highlight that salinization and the extensive use of nitrate fertilizers dominate in the coastal part of Eastern Thermaikos Gulf, the dissolution of carbonate rocks and livestock/industrial activities drive the groundwater quality status in the Upper Volturno basin, while in the Mouriki basin thermal power plant and the use of zinc fertilizers are the main factors of groundwater quality degradation. The determination of the critical sampling points was applied, considering the land use and hydrogeological and morphological characteristics of the areas. The application of the judgmental sampling approach provides reliable results regarding groundwater evolution. These results were compared to previous works and found that a non-probability sampling technique can provide the same results as a more costly method in the Mediterranean region. Thus, judgmental sampling is crucial for the optimal application of water resource management and control techniques in basins to avoid gaps in data collection.

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Section: Discussionmentioning

confidence: 99%

Application of Judgmental Sampling Approach for the Monitoring of Groundwater Quality and Quantity Evolution in Mediterranean Catchments

Ntona,

Chalikakis,

Busico

et al. 2023

Water

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“…Nitrate concentrations in groundwater exhibit seasonal variations, as observed in the southern Loess Plateau, China, where there is a tendency to increase during the dry season. This phenomenon can be attributed to various factors including irrigation, precipitation, and the vertical and lateral migration of nitrate in the unsaturated and saturated zones . However, due to lack of data, our analysis only considers annual changes in hydrologic conditions.…”

Section: Results and Discussionmentioning

confidence: 99%

“…This phenomenon can be attributed to various factors including irrigation, precipitation, and the vertical and lateral migration of nitrate in the unsaturated and saturated zones. 76 However, due to lack of data, our analysis only considers annual changes in hydrologic conditions. Therefore, our estimated nitrate concentrations in groundwater can represent only the annual average conditions, and we are unable to account for seasonal dynamics caused by the rainy and farming seasons.…”

Section: Key Features Impacting Lag Time-considered Nitrate Groundwat...mentioning

confidence: 99%

Impacts of Land Surface Nitrogen Input on Groundwater Quality in the North China Plain

Wu,

Guo,

Zhan

et al. 2024

ACS EST Water

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The North China Plain (NCP) has been facing declining groundwater levels and increasing nitrate contamination over the past few decades. Understanding the transport and accumulation of nitrogen in the subsurface is crucial to sustainable groundwater management. This work aims to evaluate the impact of historical nitrogen loading and fluctuating water tables on groundwater quality, estimate the distribution of the nitrate concentration in the aquifer, and assess the potential pollution risk associated with rising groundwater levels. The simulation involves determining the nitrate input to the aquifer and calculating the groundwater nitrate concentration using a mixing model. It is found that historical nitrogen loading has not significantly impacted shallow aquifer water quality yet, and deep groundwater nitrate concentrations remain stable. However, if groundwater levels are restored due to management strategies in the next 15 years, noticeable deterioration of shallow water quality would occur. The areas that are most vulnerable to nitrate contamination are expected to be the piedmont plain and southern and eastern parts of the central plain, with the pollution extending toward the central and northern regions. Moreover, it is estimated that the exceedance rate of nitrate concentration in the NCP could potentially double due to rising water levels by 2035.

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Hydrogeochemical characterization, quality assessment, and potential nitrate health risk of shallow groundwater in Dongwen River Basin, North China

Wang,

Chen,

Zhang

et al. 2024

Environ Sci Pollut Res

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Spatio-temporal variations of nitrate pollution of groundwater in the intensive agricultural region: Hotspots and driving forces

Cited by 18 publications

References 47 publications

Application of Judgmental Sampling Approach for the Monitoring of Groundwater Quality and Quantity Evolution in Mediterranean Catchments

Application of Judgmental Sampling Approach for the Monitoring of Groundwater Quality and Quantity Evolution in Mediterranean Catchments

Impacts of Land Surface Nitrogen Input on Groundwater Quality in the North China Plain

Hydrogeochemical characterization, quality assessment, and potential nitrate health risk of shallow groundwater in Dongwen River Basin, North China

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