News

DA1 presented the River Iller demonstration site in southern Germany, specifically on long-term and ongoing evaluation of sediment management measures at the River Iller.

Using an extensive monitoring dataset covering almost a decade, historical cross-sectional surveys, aerial imagery, discharge records, and sediment sampling campaigns were combined with new field data collected in February 2025.

From these came valuable insights into the long-term effectiveness of gravel replenishment measures and sediment retention structures. Results from this indicate that the implemented restoration measures successfully improved channel stability and helped retain coarse sediment within the restored reach.

The study also highlights that high-flow events remain the dominant driver of sediment redistribution and morphological change. While #restorationmeasures mitigate widespread erosion, periodic gravel replenishment appears necessary to maintain their long-term effectiveness.

In addition to the morphodynamic assessment, detailed spatial and temporal analyses of sediment grain-size distributions were presented. These investigations add to a better understanding of sediment continuity, habitat development, and potential colmation processes within the demonstration site.

Overall, the work shows how long-term monitoring provides the scientific basis for adaptive sediment management and supports evidence-based decision-making for sustainable river restoration.

Our partners at the University of Zagreb presented their work investigating the complex sediment dynamics at the confluence of two large rivers: the Drava and the Danube.

By combining repeated bathymetric surveys with ADCP measurements and sediment sampling over five field campaigns, the influence of flow conditions on sediment transport and deposition in this highly dynamic environment was explored.

Interactions between the two rivers, including the Danube’s backwater effect and the timing of flood waves, play a crucial role in determining where sediment is transported and where it accumulates. Understanding these processes is essential for improving navigation and supporting sustainable sediment management.

The presentation of this work once again demonstrated how valuable and important continuous field-based monitoring is for providing the evidence needed to develop adaptive river management strategies that balance navigation, flood resilience, and ecological objectives.