Computation of river bed scouring and silting deformation in the Sipaikou reach of the Yellow River in Ningxia
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Abstract:
The implementation of the " cut and bend" project of the Ningxia Ping luo Sipaikou 82shaped river channel caused a drastic change in the riverbed boundary conditions. In order to grasp the development and evolution rules of water movement, sediment movement, and river bed migration and evolution in the artificialexcavation of the river after the project operation, the project team went to the Sipikou of the Yellow River in Pingluo for site inspections and field measurements. A series of sedimentation test sections were set up acco rding to the actual terrain, current flow conditions, and preliminary forecasted river bed deformation rules of the studied river sections. The subsequent field measurements were carried out to obtain the river bed evolution laws and suspended sediments of this channel, the distribution law of particle size and sediment content, and the evolution of the mainstream of the river under the influence of shoals on the bank. Based on the actual measurement , the average degree of erosion ( 1. 607 7 m) , deposition of the river bed, and the overall scouring amount ( 356. 490 8 × 104 m3 ) of the river section were calculated and analyzed. The analysis result s suggested the strengthening of the left bank slope of the Spur Group.
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