Dear Sudhir,

 If you go to: http://www.scielo.br/scielo.php?pid=S1679-87592013000300004&script=sci_arttext

Submarine groundwater discharge revealed by radium isotopes (Ra-223 and Ra-224) near a paleochannel on the Southern Brazilian continental shelf, by

Karina Kammer AttisanoI, *; Isaac Rodrigues SantosII; Carlos Francisco Ferreira de AndradeI; Mariele Lopes de PaivaI; Idel Cristina Bigliardi MilaniIII; Luis Felipe Hax NiencheskiI,

Brazilian Journal of Oceanography

Print version ISSN 1679-8759

Braz. j. oceanogr. vol.61 no.3 São Paulo July/Sept. 2013

http://dx.doi.org/10.1590/S1679-87592013000300004

they discuss:

ABSTRACT

Submarine Groundwater Discharge (SGD) has been recognized as an important component of the ocean-continent interface. The few previous studies in Brazil have focused on nearshore areas. This paper explores SGD on the Southern Brazilian Continental Shelf using multiple lines of evidence that include radium isotopes, dissolved nutrients, and water mass observations. The results indicated that SGD may be occurring on the Continental Shelf in the Albardão region, near a paleochannel located 50 km offshore. This paleochannel may thus be a preferential pathway for the delivery of nutrient- and metal-enriched groundwater and porewater into continental shelf waters.

Descriptors: Porewater, Subterranean estuary, Permeable sediments.

with a 

CONCLUSION

This study has described the following evidence suggesting enhanced groundwater advection on the continental shelf near the Albardão Paleochannel: (1) intrusion of SASW - through the paleochannel – which may lead to density inversions and favor advective exchange at the sediment-water interface; (2) high concentration of nutrients on the bottom which require an external source (likely groundwater) and cannot be explained solely by regional river inputs or seawater masses, and (3) increase in the activities of the radium isotopes in the paleochannel region. However, further studies, focusing on the use of four radium isotopes in vertical profiles in these systems, are called for to obtain quantitative information on the contribution of the paleochannel to regional groundwater exchange processes.

I hope this helps!, best, Ken

THANKS A LOT DR KENNETH

Hi Dr. Sudhir,

  I am happy to be of help! Good luck!, Ken

With Help of satellite image also we may find the paleochannel