Nature-based sediment extraction from embanked floodplains for sustainable sediment management in the river area

Abstract Purpose This paper introduces a new automated tool to estimate the volume of sediment that can be extracted through nature-based excavations in embanked river floodplains. Methods The tool utilizes an algorithm-driven approach to identify potential sediment extraction areas and volumes while preserving the intrinsic characteristics of the river. It was applied to calculate the potential volume and composition of sediment (e.g. clay, sand, and loam) available in the embanked floodplains of the Rhine branches and the Meuse in the Netherlands. The results were then compared to volume estimates produced by experts using a more conventional design approach. Results The findings indicate that: (1) substantial amounts of sediment can be extracted from the embanked floodplains considered, (2) enhancing the visibility of the river’s intrinsic geomorphological structures aids in strategizing future nature-based solutions at the river branch level, and (3) expert-driven landscape analysis and the algorithm-driven approach complement each other. Conclusion This new tool can be used to estimate potential sediment extraction volumes during the initial planning phases of river projects. It supports the local alignment of sediment supply and demand, enabling better integration of sediment extraction projects with projects that require sediment.