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The high-lift pumping station that lifts water from sediment-laden rivers presents a serious problem that sediments deposit in forebay. To solve this problem, this paper proposes a three-dimensional numerical simulation method of water flows based on Fluent (a fluid mechanics simulation software). By constructing two models, namely the mathematical model and the turbulence model, this paper conducts numerical simulation on the flow pattern of forebay. According to the simulated velocity contour map. on-site inspection and survey, the paper studies how unit commitment optimization and divergence angle can affect flow pattern and sediment deposition in forebay. Results show that forebay keeps a good flow pattern if the units take turns to operate symmetrically. The forebay will have no reverse current zones and little sediment deposition. As the divergence angle increases between 20°~40°, the flow pattern gets worse and there are more eddy zones. Consequently, reasonable unit commitment optimization and divergence angle have a positive influence on flow pattern in forebay and are able to reduce sediment deposition. These findings can support improvement on large pumping station design and serve as theoretical reference for the operation of large pumping station. [ABSTRACT FROM AUTHOR]

Pipeline vibration of high frequency and large amplitude is an important factor that impacts the safe operation of pumping station and the efficiency of the pumps. Through conducting the vibration in-situ test of pipeline system in the pumping station, we can objectively analyze the mechanism of pipeline vibration and evaluate the stability of pipeline operation. By using DASP (data acquisition & signal processing) in the in-situ test on the 2# pipeline of the third pumping station in the general main line of Jingtaichuan electric-lifting irrigation project in Gansu Province (later known as "the general trunk third pumping station in Jingtai electric project") and then adopting time-domain analysis and cross-spectrum analysis to deal with collected data, we can acquire the vibration state in different positions of pipeline. Tests have shown that, the application of DASP in the vibration test of pressure pipeline of the pumping station, compared to the traditional test systems, can not only obtain higher test accuracy and efficiency, but can also provide theory basis and technical support for solving the vibration problems of the same-type pipeline operation. It has a good promotion value in the engineering practice. [ABSTRACT FROM AUTHOR]