Radium mass balance and submarine groundwater discharge in Sepetiba Bay, Rio de Janeiro State, Brazil

2012 ◽  
Vol 39 ◽  
pp. 44-51 ◽  
Author(s):  
Joseph M. Smoak ◽  
Christian J. Sanders ◽  
Sambasiva R. Patchineelam ◽  
Willard S. Moore
Keyword(s):  
Mass Balance ◽  
Submarine Groundwater Discharge ◽  
Rio De Janeiro ◽  
Groundwater Discharge ◽  
Sepetiba Bay ◽  
Submarine Groundwater ◽  
Janeiro State

scholarly journals Estimation of submarine groundwater discharge in the Il-Gwang watershed using water budget analysis and222Rn mass balance

2013 ◽  
Vol 28 (11) ◽  
pp. 3761-3775 ◽  
Author(s):  
Yong-Seok Gwak ◽  
Sang-Hyun Kim ◽  
Yong-Woo Lee ◽  
Boo-Keun Khim ◽  
Se-Yeong Hamm ◽  
...  
Keyword(s):  
Mass Balance ◽  
Water Budget ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Budget Analysis ◽  
Submarine Groundwater

Evaluation of submarine groundwater discharge into the northern Bohai Bay, China using 226Ra

2015 ◽  
Vol 16 (2) ◽  
pp. 362-368 ◽  
Author(s):  
Xuejing Wang ◽  
Hailong Li ◽  
Yan Zhang ◽  
Chaoyue Wang ◽  
Wenjing Qu ◽  
...  
Keyword(s):  
Mass Balance ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Balance Model ◽  
Return Flow ◽  
Bohai Bay ◽  
Mass Balance Model ◽  
Material Transport ◽  
Radium Isotope ◽  
Submarine Groundwater

Submarine groundwater discharge (SGD) has been widely recognized as a significant source of water and dissolved material transport from land to ocean. To quantify SGD into the northern Bohai Bay, China, naturally occurring radium isotope (226Ra) was measured in water samples collected along two transects in September 2012. Based on a tidal prism model, two different flushing times of the coastal water were determined to be 9.1 d and 11.5 d with respect to the different return flow factor (b) obtained from a physical model and a mass balance model of 226Ra and salinity, respectively. Using the derived flushing time, we developed a 226Ra mass balance model to estimate the SGD into the bay, which includes mixing, sedimentary input and SGD. The 226Ra budget indicated the 226Ra input from SGD accounted for 99% of the total tracer input to the northern Bohai Bay. We arrived at an average flux from SGD of 4.83 × 107 m3/d. The large volume of SGD confirms its importance in supplying a considerable quantity of nutrients to the bay.

scholarly journals Improved Approach for the Investigation of Submarine Groundwater Discharge by Means of Radon Mapping and Radon Mass Balancing

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 749 ◽  
Author(s):  
Schubert ◽  
Petermann ◽  
Stollberg ◽  
Gebel ◽  
Scholten ◽  
...  
Keyword(s):  
Mass Balance ◽  
Submarine Groundwater Discharge ◽  
Large Scale ◽  
Groundwater Discharge ◽  
Distribution Patterns ◽  
Hydrogeological Model ◽  
Fresh Groundwater ◽  
Area Of Interest ◽  
Submarine Groundwater ◽  
Mass Balancing

The paper presents an improved approach for investigating submarine groundwater discharge (SGD) based on radon mapping and radon mass balancing in the coastal sea. While the use of radon as an environmental tracer in SGD studies is well-established, we identified based on our longstanding experience six methodical shortcomings of the conventional approach and suggest corresponding developments. The shortcomings include: (1 and 2) inadequate consideration of both detection equipment response delay and influence of tidal stage; (3 and 4) incorrect quantification of radon losses, due to offshore mixing and degassing resulting in a potentially incorrect radon mass balance; (5) inaccurate determination of the terrestrial groundwater endmember, due to inhomogeneous radon distribution in the coastal aquifer; and (6) difficulties in distinguishing between discharged fresh groundwater and recirculated seawater. The improved approach is practically demonstrated in a step by step manner in a large-scale field study, which was carried out in False Bay (South Africa) and which consisted of two parts, namely (i) qualitative SGD localization along the entire False Bay coastline based on coastal radon distribution patterns and (ii) quantitative SGD investigation within a defined coastal area of interest (AOI) based on a radon mass balance (RMB). The plausibility of the AOI related results was evaluated by a hydrogeological model, used for qualitative SGD localization, and a hydrological model, applied for estimating groundwater recharge within the AOI catchment.

scholarly journals Estimating submarine groundwater discharge in Jeju volcanic island (Korea) during a typhoon (Kong-rey) using humic-fluorescent dissolved organic matter-Si mass balance

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hyung-Mi Cho ◽  
Tae-Hoon Kim ◽  
Jae-Hong Moon ◽  
Byung-Chan Song ◽  
Dong-Woon Hwang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Mass Balance ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Balance Model ◽  
Mass Balance Model ◽  
Seepage Rate ◽  
Fluorescent Dissolved Organic Matter ◽  
Submarine Groundwater

AbstractWe examined the residence time, seepage rate, and submarine groundwater discharge (SGD)-driven dissolved nutrients and organic matter in Hwasun Bay, Jeju Island, Korea during the occurrence of a typhoon, Kong-rey, using a humic fluorescent dissolved organic matter (FDOMH)-Si mass balance model. The study period spanned October 4–10, 2018. One day after the typhoon, the residence time and seepage rate were calculated to be 1 day and 0.51 m day−1, respectively, and the highest SGD-driven fluxes of chemical constituents were estimated (1.7 × 106 mol day−1 for dissolved inorganic nitrogen, 0.1 × 106 mol day−1 for dissolved inorganic phosphorus (DIP), 1.1 × 106 mol day−1 for dissolved silicon, 0.5 × 106 mol day−1 for dissolved organic carbon, 1.6 × 106 mol day−1 for dissolved organic nitrogen, 0.4 × 106 mol day−1 for particulate organic carbon, and 38 × 106 g QS day−1 for FDOMH). SGD-driven fluxes of dissolved nutrient and organic matter were over 90% of the total input fluxes in Hwasun Bay. Our results highlight the potential of using the FDOMH-Si mass balance model to effectively measure SGD within a specific area (i.e., volcanic islands) under specific weather conditions (i.e., typhoon/storm). In oligotrophic oceanic regions, SGD-driven chemical fluxes from highly permeable islands considerably contribute to coastal nutrient budgets and coastal biological production.

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