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Investigations of the sediment budget of a reach of the Yellow River in the Loess Plateau

Using sediment concentration (C S ) and discharge (Q) data measured at three gauging stations along the reach of the Yellow River in the Loess Plateau, this article focuses on high C S levels during flood periods and low C S levels under ice covered conditions. The results show that the annual maximum C S is usually less than 30 kg m -3 during the flood season at the upstream Toudaoguai gauging station (TDGS). However, both maximum C S and Q vary dramatically at the downstream Fugu gauging station (FGGS). The value of C S under ice cover is very low compared to C S during flood periods. For the same cumulative percentage undersize, the median grain size of the suspended load under ice cover is much coarser than that under open flow conditions, although Q during the period of ice cover is much less than that under open flow conditions. About 35% of the sediment eroded in the subwatershed between TDGS and FGGS was produced from the HuangPuChuan watershed, which accounts for only 10% of its drainage area.