Tracing groundwater inputs to Bay of Bengal from Sankarabarani River Basin, Pondicherry, India, using continuous radon monitoring

Srinivasamoorthy, K.; Ponnumani, G.; Prakash, R.; Gopinath, S.; Saravanan, K.; Vinnarasi, F.

doi:10.1007/s13762-018-1938-x

Cited by 25 publications

(8 citation statements)

References 33 publications

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“…Salinity and radon values were found to correlate where excess salinity correlated with lower Radon and lower salinity correlated with greater Radon suggesting the influence of fresh and recirculated seawater [33,34]. Electrical conductivity (EC) of coastal groundwater ranges between 45,800.00 to 380.00 µS cm -1 with an average of 506.00 µS cm -1 signifying well-mixed groundwater with the influence of tides along with alluvium formation noted with more excellent permeability and well-sorted sand patterns and rainfall during northeast monsoons might have influenced electrical conductivity values [35]. The suitability of water for various purposes can be aided by the variation in Total Dissolved Solids (TDS).…”

Section: Quantification Of Sgd Fluxesmentioning

confidence: 99%

“…Radon mixing loss is mainly due to the radon movement out of the system due to mixing activities at nearshore when higher radon groundwater mixes with lower radon seawater [37,42,35]. After stabilizing Radon concerning tidal variations, loss to the atmosphere, and diffusion from sediment, the net radon flux isolated should equilibrate SGD attributed Radon and those lost to the ocean as mixing loss.…”

Section: Estimation Of Mixing Loss and Net Radon Fluxmentioning

confidence: 99%

“…After stabilizing Radon concerning tidal variations, loss to the atmosphere, and diffusion from sediment, the net radon flux isolated should equilibrate SGD attributed Radon and those lost to the ocean as mixing loss. [35] have suggested mixing loss from the negative values of radon fluxes. More significant mixing loss signifies a larger SGD supply and is about 20% from the total radon fluxes [35].…”

Section: Estimation Of Mixing Loss and Net Radon Fluxmentioning

confidence: 99%

“…[35] have suggested mixing loss from the negative values of radon fluxes. More significant mixing loss signifies a larger SGD supply and is about 20% from the total radon fluxes [35]. The groundwater net mixing loss was found to range between -25.41 to 5248.94 Bq m − 2 h − 1 (Figure 4).…”

Section: Estimation Of Mixing Loss and Net Radon Fluxmentioning

confidence: 99%

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Investigation of Submarine Groundwater Discharge using Thermal Satellite and Radon mapping along the East Coast of the Tamil Nadu and Pondicherry Region, India

Srinivasamoorthy

Ponnumani

et al. 2021

ijceae

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Submarine groundwater discharge (SGD) demarcated as a significant component of hydrological cycle found to discharge greater volumes of terrestrial fresh and recirculated seawater to the ocean associated with chemical constituents (nutrients, metals, and organic compounds) aided by downward hydraulic gradient and sediment-water exchange. Delineating SGD is of primal significance due to the transport of nutrients and contaminants due to domestic, industrial, and agricultural practices that influence the coastal water quality, ecosystems, and geochemical cycles. An attempt has been made to demarcate the SGD using thermal infrared images and radon-222 (222Rn) isotope. Thermal infrared images processed from LANDSAT-8 data suggest prominent freshwater fluxes with higher temperature anomalies noted in Cuddalore and Nagapattinam districts, and lower temperature noted along northern and southern parts of the study area suggest saline/recirculated discharge. Groundwater samples were collected along the coastal regions to analyze Radon and Physico-chemical constituents. Radon in groundwater ranges between 127.39 Bq m-3 and 2643.41 Bq m-3 with an average of 767.80 Bq m-3. Calculated SGD fluxes range between -1.0 to 26.5 with an average of 10.32 m day-1. Comparison of the thermal infrared image with physio-chemical parameters and Radon suggest fresh, terrestrial SGD fluxes confined to the central parts of the study area and lower fluxes observed along with the northern and southern parts of the study area advocate impact due to seawater intrusion and recirculated seawater influence.

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Section: Quantification Of Sgd Fluxesmentioning

confidence: 99%

Section: Estimation Of Mixing Loss and Net Radon Fluxmentioning

confidence: 99%

Section: Estimation Of Mixing Loss and Net Radon Fluxmentioning

confidence: 99%

Section: Estimation Of Mixing Loss and Net Radon Fluxmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of Submarine Groundwater Discharge using Thermal Satellite and Radon mapping along the East Coast of the Tamil Nadu and Pondicherry Region, India

Srinivasamoorthy

Ponnumani

et al. 2021

ijceae

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“…Harrington et al, 2002) and radon (Rn 222 ) (e.g. Ellins et al, 1990;Kalbus et al, 2006;Moreno et al, 2014;Srinivasamoorthy et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

The use of Radon (Rn222) isotopes to detect groundwater discharge in streams draining Table Mountain Group (TMG) aquifers

Strydom

Nel

et al. 2021

WSA

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Environmental isotopes have been used for decades as natural tracers in studies aimed at understanding complex hydrogeological processes such as groundwater and surface water interactions. Radon (Rn222) is a naturally occurring, radioactive isotope which is produced from radium (Ra226) during the radioactive decay series of uranium (U238). Since U238 is present in most geological substrates, Rn222 is produced in various lithological structures and subsequently transported with groundwater through fractures and pore spaces in an aquifer towards surface water discharge points in rivers and springs. This study aimed to determine (i) the concentration of Rn222 within both surface water and groundwater in Table Mountain Group (TMG) aquifer systems, and (ii) the feasibility of using Rn222 isotopes as a natural tracer in groundwater-surface water interaction studies. This study was conducted in a highly fractured TMG aquifer system near Rawsonville, South Africa. Surface water from two perennial rivers (i.e. Gevonden and Molenaars), together with groundwater from a nearby borehole, were sampled and their corresponding Rn222 concentrations measured. Our study found median Rn222 concentrations in the Gevonden River of 76.4 Bq∙L-1 and 67.2 Bq∙L-1 in the dry and wet seasons, respectively. Nearly 12% of surface water samples exceeded 100 Bq∙L-1. These abnormally high Rn222 concentrations can only be attributed to the influx of groundwater with extremely high Rn222 concentrations. Under ambient (no pumping) conditions, Rn222 concentrations in groundwater range between 130–270 Bq∙L-1. However, when the borehole was pumped, and inflowing water from the surrounding aquifer was sampled, even higher Rn222 concentrations (391–593 Bq∙L-1) were measured. These extremely high Rn222 concentrations in groundwater are believed to be attributed to the underlying granitic geology and the prevalence of faults. The use of Rn222 isotopes as an environmental tracer in groundwater–surface water interaction studies is therefore regarded as a feasible option in similar highly fractured aquifer systems.

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Submarine Groundwater Discharge from an Urban Estuary to Southeastern Bay of Bengal, India: Revealed by Trace Element Fluxes

Prakash

Srinivasamoorthy

Sundarapandian

et al. 2020

Arch Environ Contam Toxicol

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Tracing groundwater inputs to Bay of Bengal from Sankarabarani River Basin, Pondicherry, India, using continuous radon monitoring

Cited by 25 publications

References 33 publications

Investigation of Submarine Groundwater Discharge using Thermal Satellite and Radon mapping along the East Coast of the Tamil Nadu and Pondicherry Region, India

Investigation of Submarine Groundwater Discharge using Thermal Satellite and Radon mapping along the East Coast of the Tamil Nadu and Pondicherry Region, India

The use of Radon (Rn222) isotopes to detect groundwater discharge in streams draining Table Mountain Group (TMG) aquifers

Submarine Groundwater Discharge from an Urban Estuary to Southeastern Bay of Bengal, India: Revealed by Trace Element Fluxes

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