An Account of Submarine Groundwater Discharge from the SW Indian Coastal Zone

Babu, D. S. Suresh; Anish, M.; Vivekanandan, K. L.; Ramanujam, N.; Murugan, K. Nathakiri; Ravindran, A. Antony

doi:10.2112/07-0881.1

Cited by 25 publications

(5 citation statements)

References 10 publications

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“…Basu et al (2001) Vizhinjam, Kerala Groundwater modelling 10.9 ± 6.1 cm/day. Babu et al (2009) Vizhinjam, Kerala Radium and radon isotopes 10.9 ± 6.1 cm/day Jacob et al (2009) Krishna -Godavari Coast No.…”

Section: Resultsmentioning

confidence: 99%

Impact of Over-exploitation in Coastal Groundwater on the Variations in Submarine Groundwater Discharge Rate in a Complex Two Aquifer System by Finite Element Modelling: A Case Study From South India

Rajaveni¹,

Indu²,

Brindha³

et al. 2021

Preprint

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The purpose of this study is to understand the impact of coastal groundwater over-exploitation on the variations in submarine groundwater discharge (SGD) flux rate and seawater exchange flux across the seabed. As a case study, numerical modelling techniques were applied to a complex multi-aquifer system located north of Chennai, India, which has been affected since the mid-1970s by overexploitation and seawater intrusion. Because of the relatively high hydraulic conductivity, the model shows a higher amount of seawater inflow in the central part of the region. From 2000 to 2012, the movement of seawater has increased from 17,000 m3/day to 24,500 m3/day due to groundwater overexploitation from the semi-confined aquifer. However, the quantum of flux from the sea to the aquifer has been reduced from the year 2006 due to the termination of pumping from a well field supplying a part of the city’s water supply. Model simulations show that fresh groundwater of 43,312 m3/day and saltwater of 43,815 m3/day will be discharged to the aquifer by the end of 2030. In addition to the prevailing condition, various management scenarios were also predicted to prevent the degradation of groundwater quality due to seawater intrusion. By adopting managed aquifer recharge methods, saltwater intrusion (rate of 4408 m3/day) can be reduced and SGD (rate of 22414 m3/day) rate increased. Findings from this study are expected to enhance the understanding of SGD and freshwater budget in coastal areas and in creating integrated coastal management plans.

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Section: Resultsmentioning

confidence: 99%

Impact of Over-exploitation in Coastal Groundwater on the Variations in Submarine Groundwater Discharge Rate in a Complex Two Aquifer System by Finite Element Modelling: A Case Study From South India

Rajaveni¹,

Indu²,

Brindha³

et al. 2021

Preprint

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“…Also, paleochannels may act as pathways for saltwater intrusion into these aquifers. The geochemical reactions and salinization of aquifers in general are key to their availability as a resource [19][20][21][22][23][24][25][26][27][28][29]. Offshore groundwater may become important as coastal development continues and sea levels rise [30,31].…”

Section: Introductionmentioning

confidence: 99%

Small Muddy Paleochannels and Implications for Submarine Groundwater Discharge near Charleston, South Carolina, USA

et al. 2023

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The spatial variations in Quaternary sediments on the inner continental shelf are produced by the progression of depositional environments during the latest sea-level rise, and this sedimentary architecture plays a fundamental role in controlling groundwater discharge. However, coincident seismic mapping, sediment cores, and hydrological studies are rare. Here, we combine high-resolution, 0.5–10 kHz, high-frequency seismic profiles with sediment cores to examine the nature of the sediment deposits, including paleochannels, where submarine groundwater discharge has also been studied in a 150 km2 area of the inner shelf north of Charleston, South Carolina. We used high-frequency seismic reflection to interpret seismic facies boundaries, including 16 paleochannel crossings, to 20 km offshore. From 13 vibracores taken at the intersections of the seismic lines, we defined seven lithofacies representative of specific depositional environments. The paleochannels that we cored contain thick layers of structureless mud sometimes interbedded with silt, and mud is common in several of the nearshore cores. Our results indicate that paleochannels are often mud-lined or filled in this area and were most likely former estuarine channels. Neither the paleochannels nor a mud layer were found farther than 11 km off the present shoreline. This offshore distance coincides with the strongest pulses of groundwater discharge, emerging just beyond the paleochannels. This suggests that the muddy paleochannel system acts as a confining layer for submarine groundwater flow.

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“…Most of the studies conducted in the coastal region are focused on water quality aspects and radon concentration and for some of the studies in East coast, barium and strontium were also applied [3][4][5] . A detailed study was conducted using hydrogeological modelling to quantify SGD from the coastal aquifers of Vizhinjam (Kerala) [6] . According to the various studies conducted in India and elsewhere, the primary factors that influence the discharge of groundwater into adjoining oceans is due to water table fluctuations resulting from variations in recharge, pumping rate, tidal surges and transmissivity of the aquifers.…”

Section: Introductionmentioning

confidence: 99%

Hydrogeological and Hydrochemical Characterization of Coastal aquifers with Special reference to Submarine Groundwater Discharge in Uttara kannada, Karnataka, India

et al. 2021

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Submarine groundwater discharges to the coastal ecosystems have been recognised as a source of dissolved chemical substances that cause chemical and ecological effects on sea waters. Groundwater, in many coastal areas, becomes contaminated or at least enriched with a variety of chemical substances and can have higher concentrations of dissolved solids than river water. As a result SGD makes a larger contribution to the ﬂux of dissolved chemical compounds than river run-off. Therefore, the present investigation has been carried out to understand the process of submarine groundwater discharge based on hydrological, hydrogeological and hydrochemical components. Accordingly water balance components were evaluated based on hydrological and hydrogeological investigations. Hydrochemical parameters were also evaluated to understand the impact of seawater intrusion during both pre-monsoon and post-monsoon seasons of 2019. Study revealed that, there are signatures of considerable quantity of submarine groundwater discharge in parts of Honnavara, Kumta, Ankola and Karwar talukas. The influence of seawater in coastal aquifers is quite rare all along the coast of Uttara kannada district which is attributed to high groundwater recharge(15-20%) occurring in catchment areas.

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An Account of Submarine Groundwater Discharge from the SW Indian Coastal Zone

Cited by 25 publications

References 10 publications

Impact of Over-exploitation in Coastal Groundwater on the Variations in Submarine Groundwater Discharge Rate in a Complex Two Aquifer System by Finite Element Modelling: A Case Study From South India

Impact of Over-exploitation in Coastal Groundwater on the Variations in Submarine Groundwater Discharge Rate in a Complex Two Aquifer System by Finite Element Modelling: A Case Study From South India

Small Muddy Paleochannels and Implications for Submarine Groundwater Discharge near Charleston, South Carolina, USA

Hydrogeological and Hydrochemical Characterization of Coastal aquifers with Special reference to Submarine Groundwater Discharge in Uttara kannada, Karnataka, India

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