This study is focused on assess the use of radionuclides 226Ra, 228Ra, 40K and 210Pbex, as well as the ratio 226Ra/228Ra, as tracers of marine sediment dynamic. For this the spatio-temporal variability of the activity concentration of these radionuclides was analysed in Las Canteras beach (Spain). This beach was selected due to its heterogenic composition and marine dynamics. A Cluster analysis and a Principal Component analysis (PCA) were performed to evaluate the spatial variability. The results grouped the samples in three zones related to the sediment distribution under the effects of the marine dynamics that are created by the different geomorphologies of the beach. In the temporal variability analysis, an ANOVA test and Tukey’s Honestly Significant Difference (HSD) Test pointed out that the wave action influences the activity concentration found for the different radionuclides during erosion and accumulation periods. In addition, the results of a geochemical analysis of samples from maximum and minimum activity concentration campaigns suggested that the radionuclides studied could be used as tracers of marine sediment dynamic in beach areas.
Beach sediment dynamics from natural radionuclides point of view / Ana del Carmen Arriola Velásquez, Alicia Tejera Cruz, Ignacio Alonso Bilbao, W. Geibert, I. Stimac, F. CAMARA ARTIGAS, Neus Miquel Armengol, Héctor Eulogio Alonso Hernández, Jesús García Rubiano, Pablo Martel Escobar - In: Monitoring of Mediterranean Coastal Areas: Problems and Measurement Techniques / [a cura di] Laura Bonora, Donatella Carboni, Matteo De Vincenzi, Giorgio Matteucci. - Firenze : Firenze University Press, 2022 Jun. - ISBN 979-12-215-0030-1. - pp. 16-26 (( Intervento presentato al 9. convegno International Symposium “Monitoring of Mediterranean Coastal Areas: Problems and Measurement Techniques” tenutosi a Livorno : 14 -16 June nel 2022 [10.36253/979-12-215-0030-1.02].
Beach sediment dynamics from natural radionuclides point of view
F. CAMARA ARTIGAS;
2022
Abstract
This study is focused on assess the use of radionuclides 226Ra, 228Ra, 40K and 210Pbex, as well as the ratio 226Ra/228Ra, as tracers of marine sediment dynamic. For this the spatio-temporal variability of the activity concentration of these radionuclides was analysed in Las Canteras beach (Spain). This beach was selected due to its heterogenic composition and marine dynamics. A Cluster analysis and a Principal Component analysis (PCA) were performed to evaluate the spatial variability. The results grouped the samples in three zones related to the sediment distribution under the effects of the marine dynamics that are created by the different geomorphologies of the beach. In the temporal variability analysis, an ANOVA test and Tukey’s Honestly Significant Difference (HSD) Test pointed out that the wave action influences the activity concentration found for the different radionuclides during erosion and accumulation periods. In addition, the results of a geochemical analysis of samples from maximum and minimum activity concentration campaigns suggested that the radionuclides studied could be used as tracers of marine sediment dynamic in beach areas.
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