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

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doi: 10.1016/j.jenvrad.2017.07.005
Authors:Díaz-Asencio, Misael; Corcho-Alvarado, José Antonio; Cartas-Aguila, Héctor; Pulido-Caraballé, Anabell; Betancourt, Carmen; Smoak, Joseph M.; Alvarez-Padilla, Elizabeth; Labaut-Betancourt, Yeny; Alonso-Hernández, Carlos; Seisdedo-Losa, Mabel
Author Affiliations:Primary:
Centro de Estudios Ambientales de Cienfuegos, Cienfuegos, Cuba
Federal Office for Civil Protection, Switzerland
University of Cienfuegos Carlos Rafael Rodríguez, Cuba
University of South Florida, United States
Volume Title:Journal of Environmental Radioactivity
Source:Journal of Environmental Radioactivity, Vol.177, p.290-304. Publisher: Elsevier, Oxford, United Kingdom. ISSN: 0265-931X
Publication Date:2017
Note:In English. 48 refs.; illus., incl. 3 tables, sketch map
Summary: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.
Subjects:Absolute age; Alkali metals; Alkaline earth metals; Cesium; Chemical composition; Cs-137; Dates; Fresh water; Human activity; Hydrochemistry; Isotopes; Lacustrine environment; Lake sediments; Lead; Metals; Models; Natural materials; Pb-210; Pollutants; Pollution; Ra-226; Radioactive isotopes; Radium; Reservoirs; Sedimentation; Sedimentation rates; Sediments; Statistical analysis; Tracers; Water management; Water pollution; Water resources; Water storage; Antilles; Caribbean region; Cuba; Greater Antilles; West Indies; Central Cuba; Habanilla Reservoir; Paso Bonito Reservoir
Coordinates:N215500 N223500 W0800000 W0801200
Record ID:805349-33
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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