Abstract

In this section, we will discuss the spatial pattern of bed material distribution along the river network as the link between sediment sources and sediment delivery. The variety of controls (i.e., drainage basin size and features, sediment source distribution and effectiveness, longitudinal profile shape, major anthropogenic interventions, etc.) will be related to the characteristics of riverbed deposits. In this context of sediment dynamics along the two rivers, we propose a spatial analysis of channel material grain size and grain size distribution form, by addressing downstream fining and downstream coarsening, as well as riverbed material distribution bimodality, form variability and grain petrography of fluvial sediments. Finally, sediment budgets are discussed for two major rivers representative for Romania (Siret and Prut) which highlight the role of sediment sources and human impact.

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