Depositional fluxes of 210Pb were 190.1 ± 15.9 Bqcm-1y-1 and 217.8 ± 11.8 Bqcm-1y-1 in Pra and Volta estuaries respectively. However, the ages and sedimentation rates were better explained using historical events and anthropogenic activities that occurred within the catchment areas, providing a better understanding of deficit in sediment budget caused by hydric erosion processes prevailing in the Ada and Keta beaches in Ghana, due to reduction of sediment input from the Volta estuary.
Lead-210 dating; CRS; Keta; Sedimentation rate; Coastal erosion Coastal zones are important and sensitive areas due to their sensitivity to global or man-induced changes which are of direct socio economic importance to coastal zone management policies .
Sample and radionuclides analyses Two sediment cores of length 60 cm and inner diameter 8.7 cm were sampled from the Pra and Volta estuaries (Figures 1A and 1B) using Utech corer.
The cores were taken at low tide by manually inserting the whole corer into the sediment and retrieved and corked at both ends.
Sediment accumulation rates were estimated using the 210Pb sediment dating technique which is based on alpha and gamma emitting radionuclides.