Contributions of authigenic iron compounds to fluvial suspended sediment concentrations and fluxes in the Nete sub-basin, Belgium

摘要

In the Nete Basin (Flanders, Belgium), there are indications that the chemical precipitates derived from groundwaler-associated Fe(II) seeping into the overlying surface water significantly contribute to the composition, concentration, and (luxes 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-specitlc rating curve (a slepwise linear regression model) generated from log-transformed data for suspended sediment concentration, gauge height, basellow, and interflow). Based on various estimates oi' the concentration of Fe(ll) 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 How to authigenic mineral formation is 70%.