Transfer function models of suspended sediment concentration

The majority of past suspended sediment concentration modeling efforts have relied on simple regression analysis. Problems with these models, and in particular, sediment rating curves, have been gaining attention recently. It is argued here that many of the problems result from the fact that simple regression models are inappropriate for modeling fluvial systems because they fail to adequately represent the dynamic nature of fluvial processes. Transfer function models are system models which can account for the dynamic nature of fluvial systems. Single input‐single output and multiple input‐single output transfer function models for daily suspended sediment concentration are developed for two drainage basins in Iowa. Interpretation of the models with respect to hydrologic theory indicates that model form and parameter estimates can be related to drainage basin size, land use, and physiographic characteristics.