A review on global status of fresh and saline groundwater discharge into the ocean

Selvam, S.; Perumal, Muthukumar; Roy, Priyadarsi D.; Ganapathy, Moorthy; Senapathi, Venkatramanan; Chung, Sang Yong; Elzain, Hussam Eldin; Duraisamy, Manimaran; Jesuraja, K.

doi:10.1007/s10661-022-10566-y

Cited by 10 publications

(3 citation statements)

References 110 publications

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“…River-groundwater interfaces, (i.e. hyporheic zones) 11 , 12 and the marine-groundwater interface have been much better studied 13 – 15 .…”

Section: Introductionmentioning

confidence: 99%

Groundwater inputs could be a significant but often overlooked source of phosphorus in lake ecosystems

Lisboa,

Schneider,

Rudstam

et al. 2024

Sci Rep

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Freshwater lakes are severely threatened, due largely to excess inputs of nutrients and other contaminants. Phosphorus (P) is receiving renewed attention due to recent increases in toxic cyanobacteria blooms in lakes worldwide. We investigated groundwater seepage for its role in P loading dynamics at Oneida Lake, New York, USA—one of the most well-studied lakes globally. P loading was measured at representative sites along the 88 km shoreline over three summers by directly measuring groundwater flow using seepage meters and porewater samplers. Groundwater seepage was a continuous and significant source of dissolved P over the summer months, comparable to tributary sources to the lake during that time. This constant input has enriched the concentrations of P in the nearshore surface waters, significantly above levels in the pelagic zone. Pore Total Phosphorus (TP) concentrations and loads reached extremely high values (up to 100 mg/L), with inorganic P representing only ~ 10% of TP per site. Groundwater seepage flows and P loadings were highly variable across space and time, partially explained by adjacent land uses and precipitation. Our research concludes that groundwater seepage is a significant, but overlooked, source of dissolved P and a crucial factor driving summer primary production at Oneida Lake, and likely other temperate lakes.

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“…River-groundwater interfaces, (i.e. hyporheic zones) 11 , 12 and the marine-groundwater interface have been much better studied 13 – 15 .…”

Section: Introductionmentioning

confidence: 99%

Groundwater inputs could be a significant but often overlooked source of phosphorus in lake ecosystems

Lisboa,

Schneider,

Rudstam

et al. 2024

Sci Rep

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“…Elevated nutrient levels in the environment can cause eutrophication, hypoxia events, loss of biodiversity, and habitat degradation in freshwater and coastal ecosystems [1][2][3][4][5]. A major cause of the decline in the ecological health of aquatic environments is the pressure of nutrient pollution derived from wastewater treatment works and agricultural runoff [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Export Coefficient Modelling of Nutrient Neutrality to Protect Aquatic Habitats in the River Wensum Catchment, UK

Hiscock,

Cooper,

Lovett

et al. 2023

Environments

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The pressure of nutrient pollution derived from wastewater treatment works and agricultural runoff is a reason for the decline in the ecological health of aquatic habitats. Projected residential development in catchments creates further nutrient loading that can be offset by nutrient management solutions that maintain ‘nutrient neutrality’ either onsite or elsewhere within the same catchment. This study developed an export coefficient model in conjunction with detailed farm business data to explore a nature-based solution to nutrient neutrality involving seven scenarios of crop conversion to mixed woodland or grazing grass in an area of intensive arable cultivation in the groundwater-fed Blackwater sub-catchment of the River Wensum, UK. When compared with the monitored riverine export of nutrients, the calculated nitrogen (N) and phosphorus (P) inputs under current land use showed that subsurface denitrification is removing 48–78% of the leached N and that P is accumulating in the field soils. The addition of 235 residential homes planned for 2018–2038 in the Blackwater will generate an additional nutrient load of 190 kg N a−1 and 4.9 kg P a−1. In six of the seven scenarios, the modelled fractions of crop conversion (0.02–0.21) resulted in the required reduction in P loading and more than sufficient reduction in N loading (196–1874 kg a−1 for mixed woodland and 287–2103 kg a−1 for grazing grass), with the additional reduction in N load above the requirement for nutrient neutrality potentially contributing to further improvement in water quality. The cost of land conversion is modelled in terms of crop gross margins and nutrient credits generated in the form of 0.1 kg units of N or P. For the range of scenarios considered, the annual cost per credit ranged from GBP 0.78–11.50 for N for mixed woodland (GBP 0.74–7.85 for N for grazing grass) and from GBP 160–782 for P for both scenarios. It is concluded that crop conversion is a viable option to achieve nutrient neutrality in arable catchments in eastern England when considered together with other nutrient management solutions.

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“…Affected by the combined effects of climate change and human activities, coastal areas face ecological and environmental problems, including seawater intrusion [5][6][7][8]. The core of the meaning of seawater intrusion is caused by human activity or climate change [9,10]. The most typical intrusion process is the excessive exploitation of groundwater, which causes the hydrodynamic imbalance of the aquifer and causes the brackish-freshwater transition zone to move inland [11,12].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Seawater Intrusion Process Based on Multiple Monitoring Methods: Study in the Southern Coastal Plain of Laizhou Bay, China

Liu

Gao

et al. 2023

Water

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Affected by natural factors and human activities, seawater intrusion has become a geo-environmental problem, significantly impacting human production and life. Seawater intrusion weakens coastal areas’ geo-environmental carrying capacity, limiting industry and commerce development potential. On the other hand, it may provide convenient deep seawater resources for coastal aquaculture development. Therefore, how to quantitatively analyze seawater intrusion’s process, scope, and influencing factors has become a hotspot for hydrogeological researchers. This study uses chemical sampling analysis, environmental isotope, fixed-point, and geophysical methods to monitor long-term seawater intrusion in the southern coastal plain of Laizhou Bay. According to the monitoring data, the chemical type of fresh groundwater changes from Ca·Mg-HCO3 to Na-HCO3·Cl, Na·Ca-HCO3·Cl from south to north, and the changing trend of brackish groundwater is from Mg·Na·Ca-HCO3, Mg·Ca-HCO3 to Na-Cl·HCO3, Na·Mg-Cl. Saline groundwater is mainly of the Na-Cl and Na·Mg-Cl type. Brine is of the Cl-Na type. The relationship between 18O, 2H, and Cl− shows that groundwater was affected by evaporation, dissolution, and mixing in the runoff process. The relationship between water level and TDS in monitoring wells at different locations and depths confirms the existence of seasonal variations and layered intrusion phenomena in groundwater recharge sources. From July 2018 to December 2019, the south intrusion and north retreat rates were approximately 213.3 m/a and 105.9 m/a, respectively. From August 2016 to December 2019, the seawater intrusion front on the Dawangdong profile generally retreated northward at approximately 27 m/a. The results of this study can provide a scientific basis for the utilization of groundwater in local production and life. Comparative analysis and mutual verification of multiple monitoring methods can provide basic ideas for constructing a multi-source monitoring system for seawater intrusion.

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A review on global status of fresh and saline groundwater discharge into the ocean

Cited by 10 publications

References 110 publications

Groundwater inputs could be a significant but often overlooked source of phosphorus in lake ecosystems

Groundwater inputs could be a significant but often overlooked source of phosphorus in lake ecosystems

Export Coefficient Modelling of Nutrient Neutrality to Protect Aquatic Habitats in the River Wensum Catchment, UK

Analysis of the Seawater Intrusion Process Based on Multiple Monitoring Methods: Study in the Southern Coastal Plain of Laizhou Bay, China

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