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

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Abstract

Submarine groundwater discharge and associated trace element fluxes from the Coleroon River estuary to south bay, India, has been attempted, because increasing trace elements could result in harmful algal blooms and eutrophication. Trace elements (Al, Cr, Mn, Fe, Ni, Cu, Zn, Sr, Mo, Ba, Pb, Th, and U) in surface water, pore, and groundwater samples were monitored for 10 days in three locations (A, B, and C) by considering tidal fluctuations. The trace elements Al, Cr, Fe, Ni, Zn, Sr, Mo, Pb, Th, and U were greater and found to be influenced by processes, such as fresh groundwater discharge and seawater intrusion. Lower Mn, Cu, and Ba signifies impact due to sediment adsorption, mixing, and elemental exchange during fresh groundwater and seawater mixing. Salinity versus trace element plot infers greater trace element mobility with cumulative salinity influenced by the conformist behavior of freshwater, seawater, and mixing. The calculated submarine groundwater discharge supported dissolved trace elements fluxes were 107,047.8 n mol d−1 m−1 for location A, 183,520.2 n mol d−1 m−1 for location B, and 181,474.4 n mol d−1 m−1 for location C, respectively. Variations in dissolved trace elements fluxes are attributed to variations in pH, free redox environment in the aquifer, adsorption or desorption by sediments, and the environmental cycle of marine organisms.

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Abbreviations

SGD:

Submarine groundwater discharge

TE:

Trace element

STE:

Subterranean estuary

BGL:

Below ground level

SW:

Surface water

GW:

Groundwater

PW2:

Pore water 60 cm

PW4:

Pore water 120 cm

Al:

Aluminium

Ba:

Barium

Cr:

Chromium

Cu:

Copper

Fe:

Iron

Mn:

Manganese

Mo:

Molybdenum

Pb:

Lead

Sr:

Strontium

Th:

Thorium

U:

Uranium

Zn:

Zinc

FSGD:

Fresh SGD

RSGD:

Recirculated SGD

dTE:

Dissolved trace elements

n mol d 1 m 1 :

Nano mol per day per meter

mg L 1 :

Milli gram per litre

km:

Kilo meter

m:

Meter

mm y 1 :

Milli meter per year

°C:

Degree Celsius

L min 1 :

Litre per minute

μm:

Micro meter

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Acknowledgements

The authors thank Prof. S. Balakrishnan, Department of Earth sciences, Pondicherry University for his guidance and support in trace elemental analysis. They also thank G. Rahul, Pondicherry University, for help with statistical inferences. The comments and critical review of this work by two anonymous reviewers and editor are greatly appreciated.

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Correspondence to R. Prakash.

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The authors declare that they have no conflict of interest.

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Prakash, R., Srinivasamoorthy, K., Sundarapandian, S.M. et al. Submarine Groundwater Discharge from an Urban Estuary to Southeastern Bay of Bengal, India: Revealed by Trace Element Fluxes. Arch Environ Contam Toxicol 80, 208–233 (2021). https://doi.org/10.1007/s00244-020-00774-3

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  • DOI: https://doi.org/10.1007/s00244-020-00774-3

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