210Pb and 137Cs as tracers of recent sedimentary processes in two water reservoirs in Cuba

• Autores: Díaz Asencio, Misael; Corcho Alvarado, José Antonio; Cartas Águila, Héctor Alejandro; Pulido Caraballé, Anabell; Betancourt, Carmen R.; Smoak, Joseph M.; Alvarez Padilla, Elizabeth; Labaut Betancourt, Yeny; Alonso Hernández, Carlos; Seisdedo Losa, Mabel
• Año de publicación: 2017
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: reservoir; sediment; radionuclides; catchment
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Hanabanilla and Paso Bonito Reservoirs are the main fresh water sources for about half a million inhabitants in central Cuba. Prior to this investigation precise information about the losses of storage capacity was not available. Sedimentation is the dominant process leading to reduction in water storage capacity. We investigated the sedimentation process in both reservoirs by analyzing environmental radionuclides (e.g. 210Pb, 226Ra and 137Cs) in sediment cores. In the shallow Paso Bonito Reservoir (mean depth of 6.5 m; water volume of 8 × 106 m3), we estimated a mean mass accumulation rate (MAR) of 0.4 ± 0.1 g cm−2y−1 based on 210Pb chronologies. 137Cs was detected in the sediments, but due to the recent construction of this reservoir (1975), it was not possible to use it to validate the 210Pb chronologies. The estimated MAR in this reservoir is higher than the typical values reported in similar shallow fresh water reservoirs worldwide. Our results highlight a significant loss of water storage capacity during the past 30 years. In the deeper and larger Hanabanilla Reservoir (mean depth of 15.5 m; water volume of 292 × 106 m3), the MAR was investigated in three different sites of the reservoir. The mean MARs based on the 210Pb chronologies varied between 0.15 and 0.24 g cm−2y−1. The MARs calculated based on the 137Cs profiles further validated these values. We show that the sediment accumulation did not change significantly over the last 50 years. A simple empirical mixing and sedimentation model that assumes 137Cs in the water originated from both, direct atmospheric fallout and the catchment area, was applied to interpret the 137Cs depth profiles. The model consistently reproduced the measured 137Cs profiles in the three cores (R2 > 0.9). Mean residence times for 137Cs in the water and in the catchment area of 1 y and 35–50 y, respectively were estimated. The model identified areas where the catchment component was higher, zones with higher erosion in the catchment, and sites where the fallout component was quantitatively recorded in the sediments.
Fil: Díaz Asencio, Misael. Universidad Autónoma de Campeche; México. Centro de Estudios Ambientales de Cienfuegos; Cuba
Fil: Corcho Alvarado, José Antonio. Federal Office for Civil Protection; Suiza
Fil: Cartas Águila, Héctor Alejandro. Centro de Estudios Ambientales de Cienfuegos; Cuba
Fil: Pulido Caraballé, Anabell. Centro de Estudios Ambientales de Cienfuegos; Cuba
Fil: Betancourt, Carmen R.. Universidad de Cienfuegos Carlos Rafael Rodriguez; Cuba
Fil: Smoak, Joseph M.. University of South Florida; Estados Unidos
Fil: Alvarez Padilla, Elizabeth. Centro de Estudios Ambientales de Cienfuegos; Cuba
Fil: Labaut Betancourt, Yeny. Centro de Estudios Ambientales de Cienfuegos; Cuba. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Alonso Hernández, Carlos. Centro de Estudios Ambientales de Cienfuegos; Cuba
Fil: Seisdedo Losa, Mabel. Centro de Estudios Ambientales de Cienfuegos; Cuba