Author(s): Zuwen Ji; Chunhong Hu; Jianxing Xia; Haihua Hu
Keywords: Dredging efficiency; Sedimentation; Yellow River; Dredging channel
Abstract: According to experimental data, dredging in the lower Yellow River is possible and has some advantages. In general, the dredging efficiency consists of three parts: the scouring and depositing rate (SDR) in the upper dredged channel, the fill-in rate in the dredged channel and the scouring and depositing in the lower dredged channel. The factors affecting dredging efficiency include the dimension of dredged channel and the flow and sediment conditions, and the effects of the latter are larger than that of the former. If the ratio of width to depth of dredged channel was about from 5 to 8, and the length of dredging channel was about 10 km, the dredging efficiency would be the highest in the Lower Yellow River. For the same dimension of dredging channel, the dredging efficiency would decrease rapidly with increase of the ratio of sediment concentration to discharge. When the ratio is about 0.025, the dredging efficiency is better. When the ratio is over 0.05, the dredging efficiency almost disappears.