Vertical profiles of trace metals and acid-volatile sulphide in a dynamic sedimentary environment: Lake Ketel, The Netherlands

Fine-scale solid-phase trace metal and acid-volatile sulphide profiles are presented for sediment cores taken at four locations in Lake Ketel, a dynamic sedimentation basin of the river Rhine in The Netherlands. The purpose of this study was to relate these profiles to the dynamics of sediment transport in the lake. The internal cycling of solids in the lake affects the distribution of trace metals and acid-volatile sulphide in the sediments. Comparison of vertical profiles of trace metals and sulphide indicates significant spatial variation in the dynamics of sediment transport in Lake Ketel. The construction of a dredge spoil storage depot in 1996 seems to have significantly influenced the hydrodynamic and sediment dynamics in Lake Ketel. Consequently, deposition rates in Lake Ketel based on comparison of solid-phase trace metal concentrations in the sediments and historical levels in Rhine suspended matter can only be used as rough estimates.