scholarly journals Analysis and Study of Flow Patterns and Sediment Deposition in the Forebay of a Forward Intake Pumping Station

2022 ◽  
Author(s):  
Haidong WANG ◽  
Chunguang LI ◽  
Suiju LV ◽  
Lulu SONG
Keyword(s):  
Volume Fraction ◽  
Yellow River ◽  
Sediment Concentration ◽  
Flow Patterns ◽  
Simulation Software ◽  
Sediment Deposition ◽  
Fluid Simulation ◽  
Normal Operation ◽  
The Yellow River ◽  
Pumping Station

Abstract In Northwest China, the sediment concentration of the Yellow River is high. A project to investigate the operation of a pumping station shows that the flow patterns in the forebay and inlet tank are disordered, and there is sediment deposition that endangers the normal operation and safety of the pumping station. To solve this problem, the three-dimensional two-phase water-sediment flow in the forebay of the pumping station is modeled by using fluid simulation software, and diagrams of the sediment volume fraction content and vector distribution in the flow layers of different sections are obtained. Combined with the multiphase flow theory of mixtures and the realizable turbulent kinetic energy equation, the location and formation mechanism of each vortex, as well as the area and degree of sediment deposition in the forebay, are analyzed. The actual engineering and numerical simulation results are compared to verify the accuracy of the simulation. The results show that the main reason for sediment deposition is the high sediment concentration of the Yellow River, but the flow pattern disorder is affected by a specific design defect of the forebay, which makes the sediment deposition worse. The results of this study provide specific guidance and methods for the construction and transformation of the forebay of the pump station in the future; construction to weaken the return area to a certain extent can reduce the degree of sedimentation.

Numerical simulation of flow patterns in the forebay and suction sump of Tianshan pumping station

2014 ◽  
Vol 9 (4) ◽  
pp. 519-525
Author(s):  
Jun Li ◽  
Yongmei Cao ◽  
Chuanchang Gao
Keyword(s):  
Numerical Simulation ◽  
Yellow River ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Flow Patterns ◽  
The Yellow River ◽  
Technical Improvement ◽  
Pumping Station ◽  
Turbulence Flow ◽  
Simulation Results

Tianshan Pumping Station takes water from the Yellow River. A three-dimensional (3D) mathematical model of turbulence flow patterns in the forebay and suction sump was developed and a 3D turbulent flow simulation technique applied to numerical calculation of the flow pattern characteristics in both the original and rebuilt forebays of the pumping station. The numerical simulation results were analyzed and contrasted. The results showed that, with technical improvement, surface backflow was avoided, and bottom velocity in the forebay was increased while bottom velocity in the suction sump was unchanged. Because of this, there was no sediment deposition in the bottom of the forebay, and flow velocities in the forebay and suction sump were more evenly distributed.

scholarly journals Effect of Wave, Current, and Lutocline on Sediment Resuspension in Yellow River Delta-Front

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 845 ◽  
Author(s):  
Bowen Li ◽  
Yonggang Jia ◽  
J. Paul Liu ◽  
Xiaolei Liu ◽  
Zhenhao Wang
Keyword(s):  
Suspended Sediment ◽  
Yellow River ◽  
Yellow River Delta ◽  
Sediment Concentration ◽  
River Delta ◽  
Low Flow ◽  
The Yellow River ◽  
Delta Front ◽  
The Yellow River Delta ◽  
Hindered Settling

Historically, the Yellow River in China discharges > 1 × 109 ton/yr sediment to the sea, and has formed a large delta in the western Bohai Sea. Its river mouth is characterized by an extremely high suspended sediment concentration (SSC), up to 50 g/L. However, the hydrodynamic factors controlling the high suspended sediments in the Yellow River estuary are not well understood. Here, we conducted two hydrodynamic observations and SSC measurements in the winter and spring low-flow seasons of 2014–2015 and 2016–2017 under five sea conditions, including calm-rippled, smooth-wavelet, slight, moderate, and rough, in the Yellow River Delta-front during the observation period. Under calm-rippled conditions, the contribution of currents to the total resuspended sediment concentration (RSC) was 77.7%–100.0%. During the smooth-wavelet and slight periods, the currents’ contribution decreased as low as 30% and 3.0% of the total RSC, respectively. Under moderate and rough-sea conditions, waves accounted for at least 70% and 85% of the total RSC, respectively. The results indicate that 20 cm-thick lutoclines were created after a significant increase in the wave height to a peak value followed by a decrease. When the SSC is over 3 g/L and hydrodynamic conditions could not break the lutoclines, the flocculent settling of suspended sediment changes to hindered settling in the Yellow River Delta. Under hindered settling, the settling velocity decreases, and the resuspended sediments remains in the lutoclines and their lower water layers. This study reveals different controlling factors for the high SSC near a river-influenced delta, and helps us get a better understanding of a delta’s resuspension and settling mechanisms.

Flow and Sediment Conditions for the Yellow River Estuary Balance

2013 ◽  
Vol 405-408 ◽  
pp. 2226-2230
Author(s):  
Shou Bing Yu ◽  
Kai Rong Wang ◽  
Wan Zhan Wang
Keyword(s):  
Yellow River ◽  
River Estuary ◽  
Sediment Concentration ◽  
Yellow River Estuary ◽  
Water Volume ◽  
The Yellow River ◽  
Sediment Volume ◽  
Elevation Data ◽  
Annual Water ◽  
Sediment Data

Multi-object application and water and sediment regulation of the Xiaolangdi Reservoir since 2001 have changed the flow and sediment conditions entering the Lower Reaches of Yellow River and the Estuary. Field flow and sediment data at Lijin Hydrological Station and river cross section elevation data downstream from Lijin Section during 2001~2010 have shown that the Estuary have been in a state of little scouring. The 2D mathematical model has been used to study the flow and sediment conditions for the Yellow River Estuary balance. The conclusions have arrived at that total annual water volume is 196 × 108 m3, total annual sediment volume is 1.40~1.70×108 t, coarse sediment concentration is 3kg/m3.

scholarly journals MODELING SEDIMENT TRANSPORT IN THE YELLOW RIVER MOUTH

2011 ◽  
Vol 1 (32) ◽  
pp. 13
Author(s):  
Haibo Zong ◽  
Pingxing Ding ◽  
Fengyan Shi
Keyword(s):  
Sediment Transport ◽  
Yellow River ◽  
Sediment Resuspension ◽  
River Mouth ◽  
Sediment Concentration ◽  
The Yellow River ◽  
Numerical Studies ◽  
Wave Effects ◽  
Coastal Sediment Transport ◽  
Yellow River Mouth

Yellow River is famous for its high sediment concentration, which carries a huge amount of sediment into Bohai Sea during the flood season. In the mouth of Yellow River, the suspended sediment concentration (here after: SSC) are relatively high and the average depth is generally shallow. Recent studies indicated that in the shallow and micro-tide area, wave usually is a primary mechanism for bottom sediment resuspension. Most numerical studies of sediment transport in the Yellow River mouth didn't include the wave effects. To analyze the sediment transport in the Yellow River mouth with wave effect, a Coastal Sediment Transport Modeling System (CSTMS) was applied in this study.

scholarly journals Analysis of Runoff-Sediment Cointegration and Uncertainty Relations at Different Temporal Scales in the Middle Reaches of the Yellow River, China

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2589
Author(s):  
Xiujie Wang ◽  
Dandan Li ◽  
Ximin Yuan ◽  
Xiling Qi ◽  
Pengfei Zhang
Keyword(s):  
Sediment Load ◽  
Yellow River ◽  
Hysteresis Loops ◽  
Yellow River Basin ◽  
Sediment Concentration ◽  
The Yellow River ◽  
Uncertainty Relations ◽  
Rating Curves ◽  
Runoff Sediment ◽  
Cointegration Relationship

To understand the intricate runoff-sediment relationship in the middle Yellow River basin (MYRB), the Toudaoguai, Longmen, Tongguan and Huayuankou sites in the MYRB were selected to analyze the deterministic equilibrium and uncertainty relations of runoff-sediment based on 55-year hydrological data at multi-time scales. The Johansen test and wavelet neural network were used to verify the cointegration relationship among hydrological series. Runoff-sediment uncertain statistical relations and dynamics in the MYRB were also analyzed based on rating curves and hysteresis loops. The results showed that the logarithmic sequences of sediment load (SL), runoff and suspended sediment concentration (SSC) conformed to a linear cointegration relationship at the Toudaoguai station or in spring, winter or under small flow at other stations, but a nonlinear cointegration relationship was observed in other cases at other stations. Regarding runoff-sediment uncertain relationships, the rating curves, and hysteresis loops differed in stations (Toudaoguai and the other stations), as well as discharge (threshold: 1000 m3/s), season (ice-flood and rainy season) and saturation of flow at flood and monthly scales. At the annual scale, phased and unsynchronized characteristics of runoff and sediment load were evident with a decreasing trend. This study on the runoff-sediment relationship can rationally provide a theoretical basis for the management and development of the Yellow River and other similar rivers with sufficient sediment, especially for areas with serious soil erosion.

High Sediment Concentration Underwater Communication Using Current Field

2013 ◽  
Vol 475-476 ◽  
pp. 45-49 ◽  
Author(s):  
Bao Ping Su
Keyword(s):  
Yellow River ◽  
Sediment Concentration ◽  
Light Transmittance ◽  
The Yellow River ◽  
Underwater Communication ◽  
Radio Waves ◽  
Current Field ◽  
Communication Devices ◽  
Major River ◽  
Communication Distance

The Yellow River is the muddiest major river in the world. It has thick bottom sediment and its water has low light transmittance, which can make sound signal, laser, radio waves through it attenuated and communication distance in its waters limited. So it is unable to meet the communication requirements of the underwater survey. In order to solve the problem, based on the electrical conductivity of water, an idea of underwater communication using current field was proposed, a model of underwater current field communication channel was also made according to electromagnetic field theory. The relationship among the received signal, transmitting voltage, communication distance and other parameters were analyzed. Underwater current field communication devices were then developed. It was proved by test that the bi-way underwater communication of such devices was correct, reliable, and easy to perform, thus a practical and feasible communication means for the underwater survey in the Yellow River silt layer was provided.

scholarly journals The Effect of Sedimentin Yellow River on Hydraulic Characteristics of Spray Sprinkler

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1349
Author(s):  
Yisheng Zhang ◽  
Jinjun Guo ◽  
Huiliang Wang
Keyword(s):  
Water Conservation ◽  
Water Distribution ◽  
Yellow River ◽  
Sprinkler Irrigation ◽  
Water Shortage ◽  
Sediment Concentration ◽  
Application Rate ◽  
Hydraulic Performance ◽  
The Yellow River ◽  
High Level

The water shortage has become a great challenge for Yellow River irrigation regions; for the high level of suspended sediment in Yellow River, sprinkler irrigation, which has achieved superior anti-clogging performance, can be an effective solution for water conservation in agriculture management. For the direct utilization of the Yellow River water resource in irrigation land as irrigated by movable sprinkler irrigation systems, a series of experiments about the effect of sediment-water on the hydraulic performance of fixed spray plate sprinkler was conducted. The results showed that peak water precipitation rate appeared as both clean and sediment-water jetting from the groove, and the differences were that sediment-water minimized peak value of water application rate and increased wetted radius efficiently. The water distribution of an individual sprinkler resembled lotus shape with different working conditions, and the application rate nearby sprinkler increased with the increase insediment concentration, resulting in higher water distribution uniformity. In addition, sediment-water increased the spray distance remarkably with a maximum increasing ratio of 7.79%; meanwhile, it led to the transfer of peak application region to the edge of the wetted circle and, consequently, the wetted area increased. The calculation result of the water diffusion coefficient indicated that sediment-water contributed to splintering water jet effectively, but the analysis of variance showed that no significant change was obtained with increasing sediment concentration. All these results suggested that the sediment-water in Yellow River could be directly utilized in agriculture irrigation with superior hydraulic performance, and it would be helpful to protect and maximize the utilization of the Yellow River resource.

Study on Dynamic Equilibrium of Sediment Transport by Qingshuigou Course of the Yellow River

2012 ◽  
Vol 212-213 ◽  
pp. 351-357 ◽  
Author(s):  
Shou Bing Yu ◽  
Kai Rong Wang ◽  
Wan Zhan Wang
Keyword(s):  
Sediment Transport ◽  
Dynamic Equilibrium ◽  
Yellow River ◽  
River Estuary ◽  
Longitudinal Section ◽  
Sediment Concentration ◽  
Yellow River Estuary ◽  
Water Volume ◽  
The Yellow River ◽  
Annual Total

The multi-object application of the Xiaolangdi Reservoir and water and sediment regulation have greatly changed flow and sediment conditions emptying into the Yellow River Estuary. By use of flow and sediment field data at the Lijin Hydrological Station and river cross-section elevation data during 2001~2010, the paper has analyzed characteristics of the Yellow River Estuary in terms of incoming flow and sediment conditions, main flume area, average river longitudinal section and river length. The results show that annual total water volume emptying into the Estuary since 2003 has maintained about 200×108 m3, annual total sediment 1.77×108 t, whole annual average sediment concentration 9.3kg/m3, which are stable and beneficial for dynamic equilibrium of sediment transport. Interannual stability of main flume area, average river bed elevation and river length since the Lijin Section during 2007-2010 indicate that current Qingshuigou Course of the Yellow River has achieved dynamic equilibrium of sediment transport.

scholarly journals Optimal design of microvascular networks based on non-dominated sorting genetic algorithm II and fluid simulation

2017 ◽  
Vol 9 (7) ◽  
pp. 168781401770817 ◽  
Author(s):  
Peng Li ◽  
Yuan Liu ◽  
Tian Zou ◽  
Jinyong Huang
Keyword(s):  
Genetic Algorithm ◽  
Volume Fraction ◽  
Polymeric Materials ◽  
Simulation Software ◽  
Void Volume Fraction ◽  
Fluid Simulation ◽  
Void Volume ◽  
Average Error ◽  
Self Healing ◽  
Microvascular Networks

The non-dominated sorting genetic algorithm II is used to design the microvascular networks embedded in self-healing polymeric materials. And the fluid simulation software Fluent is used to validate the optimization result obtained by non-dominated sorting genetic algorithm II. Two objective functions are considered, namely, the void volume fraction and flow efficiency. A total of 222 solutions are obtained, and the head loss is in the range of (3.88 × 10−7 m, 2.36 × 10−6 m), whereas the void volume fraction is in the range of (4.39%, 5.12%). The simulation velocities are close to optimization velocities. The average error rate of selected solutions (a), (b), and (c) is 22.6%, 26.4%, and 35.2%, respectively.

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