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Quantifying the in‐channel contribution to suspended‐sediment concentration, a concept for sediment yield apportionment using limited data

Recently, the focus on sediment source assessment has increased because of the importance it has in prioritizing management strategies to limit soil loss, water quality deterioration, and aquatic ecosystems degradation. In this work, a rapid integration technique is proposed to separate the sediment yield portion detached from the stream channel by water erosion and the portion supplied from the watershed or stored within the channel. The concept of the lower bound curve was established based on hysteresis analysis fundamentals. On this basis, a straightforward calculation technique was designed. The lower bound curve simplifies the estimation of sediment sources' contributions using continuous concentration‐discharge measurements. The method was tested using flood events from six United States Geological Survey stations. According to hysteresis analysis fundamentals, the method was validated relying on successive and multipeak events and sediment depletion as an indicator. The analysis of successive floods showed consistent sediment depletion criteria, indicating that the lower bound curve corresponds to the stream contribution. Consequently, the method can successfully separate and quantify the contribution of the stream channel to suspended sediment yield. Minor events were found to be unable to reach sediment depletion. However, proceeding with multi‐peak events solved this issue, which improved the sediment yield estimations compared to single‐peak processing.