Figure 8 Annual sediment deposition and erosion between the HYK and GC stations during different periods (positive values indicate deposition, and negative values indicate erosion).
Table 3 shows the rates of erosion and deposition in the floodplains (including the left floodplain and right floodplain) of the various reaches in different periods. Before the operation of the XLD reservoir, the deposition rates ranged from 1.6-3.7 cm/yr in the floodplain of the braided reach (between HYK and GC) during 1965-1999 (Zhang et al., 2017). However, the floodplain gradually changed from a sedimentation pattern to an erosion pattern since the operation of the XLD reservoir, with an average erosion rate of 1.3 cm/yr between 2000 and 2017.
Table 3 Erosion/deposition rates in the floodplains of the different reaches