Model analyses of the contribution of in-channel processes to sediment concentration hysteresis loops

摘要: Summary Sediment concentration ( SC )–water discharge Q ) relations in rivers are typically governed by multiple and relatively complex processes. Due to hysteresis effects, sediment discharges can differ for similar or equivalent water discharges, which causes scatter empirical datasets may decrease the predictive power of rating curves. Such effects must therefore be understood accounted make dependable predictions river system management. The overall objectives this study develop modelling approaches suitable reproducing predicting at larger scales investigate possible contribution in-channel processes (erosion deposition) loops. To relevant field-scale conditions, we a one-dimensional dynamic transport model downstream Tuul River (northern Mongolia), investigating along 141 km stretch during hydrological year. results show that present approach reproduce both anti-clockwise clockwise effects. Importantly, alone cause considerable without being reinforced catchment such as hillslope erosion. specific contributions from introduced data into curves, decreasing their R 2 -values unity approximately 0.5 0.6. More generally, changes number magnitude high-flow events, caused climatic other anthropogenic factors, could influence total deposition, was primarily found occur short events. potential also have important implications spreading polluted sediments.