Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-789 - C1-794|
|Published online||25 March 2010|
Radionuclide distribution in tidal flat sediments of the Westerschelde estuary
EDF, Laboratoire National d'Hydraulique et Environnement, 6 quai Watier, 78401 Chatou cedex, France
Depth profiles of the particle-reactive radionuclides 210Pb, 137Cs and 7Be were established in sediments of a tidal flat in the Westerschelde. Cores were collected at different seasons at selected sites with contrasting characteristics. Accumulation rates estimated from 137Cs profiles are consistent between the five sites with values comprised between 1.1 at the marginal sites and 2.5 cm y-1 for the central part. Although the very low level of excess 210Pb limits the precision of this method, profiles of 210Pbxs with depth allow calculating a range of sedimentation rates equivalent to those derived from 137Cs data. At the muddy site, the vertical distribution of radionuclides revealed the existence of an important accumulation layer of fine particles at a depth of around 10 cm at the muddy site, may be in relation with biological and physical processes. The vertical distribution of 7Be in the top 6 cm exhibits wide variability on seasonal scale, with the highest inventories and bioturbation rates observed in summer. This trend is clearly related to the seasonal variation of silt content of surface sediments.
© EDP Sciences, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.