Figure 6 Distribution of the median
sediment grain size between HYK and GC in the LYR.
In the braided reach (between HYK and GC), the median grain size of the
bed material decreases gradually from HYK to GC, and the grain size of
sediment in the main channel is generally larger than that in the
floodplain (see Figure 6). The average median particle sizes of the bed
material in the main channel and floodplain are approximately 0.1 mm and
0.05 mm, respectively, corresponding
to dry bulk densities ranging from 1.233-1.410 t/m3and 1.121-1.249 t/m3, respectively (Shao & Wang,
2005). Considering the characteristics of the fine sediment particle
size in the LYR, the dry bulk densities of the bed material in the main
channel and floodplain are 1.233 and 1.121 t/m3,
respectively. The scouring and
silting mass in the braided reach during the period 2000 - 2017 can be
calculated.