<p>Eutrophication, pollution and climate change are increasing challenges for aquatic ecosystems. The newly developed physical model experiment offers a structured approach to investigate nutrient distribution, taking into account the morphological boundary conditions of rivers. By analysing scenarios of different sediment layering and nutrient additions, riverine processes can be replicated. This paper introduces the functional principle of the experiments, the measurement methodology, and preliminary findings on nutrient-sediment interactions. The innovative method allows for the examination of nutrient-sediment interactions within physical model experiments, revealing diverse temporal and spatial patterns of nutrient enrichment and remobilisation in/from the sediment. The study highlights how nutrient accumulation in the sediment is influenced by the form of nutrient addition, whether liquid or particle-bound, providing insights into the dynamics of aquatic systems under environmental stress.</p>