Statistical validation of the model of diffusion-convection (MDC) of Cs-137 for the assessment of recent sedimentation rates in coastal systems

Author(s)

de Lima Ferreira, Paulo Alves ; Siegle, Eduardo ; Franca Schettini, Carlos Augusto ; de Mahiques, Michel Michaelovitch ; Lopes Figueira, Rubens Cesar

• Document type: Journal article
• Source: JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY; v. 303, n. 3, p. 13-pg., 2015-03-01.

Abstract

This study aimed the validation of the model of diffusion-convection (MDC) of Cs-137 for the calculation of recent sedimentation rates in 13 sedimentary cores of two Brazilian coastal systems, the Cananeia-Iguape and Santos-So Vicente estuarine systems. The MDC covers key factors responsible for Cs-137 vertical migration in sediments: its diffusion to the interstitial water and the vertical convection of this water through the sediments. This study successfully validated the MDC use to determine sedimentation rates, which was statistically validated not only with Pb-210(xs) (unsupported Pb-210) models, widely used in oceanographic studies, but also by literature values for those regions. (AU)

• FAPESP's process: 12/08634-6 - Application of the model of vertical migration of Cs-137 for the calculus of recent sedimentation rates in coastal environments
• Grantee: Paulo Alves de Lima Ferreira
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 11/50581-4 - Susceptibility and resilience of urban estuarine systems to global changes: hydro-sedimentologic budget; sea-level rise; response to extreme events
• Grantee: Rubens Cesar Lopes Figueira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 09/01211-0 - Historical of anthropic activity in Bertioga Channel, Sao Paulo, Brazil: levels of metals, semi-metals and recent sedimentation in sedimentary columns
• Grantee: Rubens Cesar Lopes Figueira
• Support Opportunities: Regular Research Grants