Contributions of authigenic iron compounds to fluvial suspended sediment concentrations and fluxes in the Nete sub-basin, Belgium
2005; International Association of Hydrological Sciences; Volume: 291; Linguagem: Inglês
ISSN
0144-7815
AutoresE. Vanlierde, Jan De Schutter, Joris Meys, F. Mostaert, Patric Jacobs,
Tópico(s)Groundwater and Isotope Geochemistry
ResumoIn the Nete Basin (Flanders, Belgium), there are indications that the chemical precipitates derived from groundwater-associated Fe(II) seeping into the overlying surface water significantly contribute to the composition, concentration, and fluxes of suspended sediment. For purposes of evaluation, model-derived concentrations were compared with those determined from actual samples. Missing suspended sediment concentrations were estimated from a site-specific rating curve (a stepwise linear regression model) generated from log-transformed data for suspended sediment concentration, gauge height, baseflow, and interflow). Based on various estimates of the concentration of Fe(II) in groundwater, as well as several other factors, authigenic iron compounds may constitute from 36 to 97% of the sediment load in the basin. However, the best current estimate, based on a rating curve model relating groundwater flow to authigenic mineral formation is 70%.
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