scholarly journals Water and sediment graded management to alleviate the “secondary suspended river” in the lower reaches of the Yellow River

2018 ◽  
Vol 246 ◽  
pp. 01037
Author(s):  
Junhua Li ◽  
Enhui Jiang ◽  
Linjuan Xu
Keyword(s):  
Yellow River ◽  
Sediment Concentration ◽  
Water Volume ◽  
The Yellow River ◽  
Peak Time ◽  
Reservoir Water ◽  
Destructive Effect ◽  
Average Flow ◽  
Water And Sediment ◽  
The Difference

The “secondary suspended river” poses a huge threat to the safety of embankment in the lower reaches of the Yellow River. The formation of the “secondary suspended river” is mainly attributed to the “less water and more sediment, inconsistent water-sediment relationship” of the Yellow River. Through the analysis of the relationship between the evolution of the lower reaches of the Yellow River and the loss caused by disasters and flood and magnitude of sediment concentration, this paper thinks that the Yellow River must pay attention to the graded regulation of water and sediment. For small and medium-sized flood with small sediment concentration, according to the flood magnitude and the reservoir water volume in the upper and middle reaches, Impoundment and filling water to build the peak time at the right time is necessary and the flood processes which are less than 2600 m3/s should be avoided in the scheduling process. Based on the shape of river channel of high flow flood in floodplain and average flow flood in floodplain, and the difference between the sediment transport efficiency of flood and the difference between the loss to the lower floodplain area, the average flow flood in floodplain which is between 6000 m3/s should be avoided in the scheduling process as far as possible. In order to relieve the development trend of the “secondary suspended river”, the regulation of “brushing groove of silt beach” should be insisted on for large flood. But the high sediment concentration flood should be avoided because of its serious destructive effect on the lower reach. At the same time, it also calls for strengthening the research and popularization of reservoir sediment treatment and sediment resource utilization technology.

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.

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 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.

Analysis for the Cause of Sharp Cutoff of Water and Sediment in He-Long Reach the Yellow River Middle Area

2012 ◽  
Vol 212-213 ◽  
pp. 272-277 ◽  
Author(s):  
Ling Ling Kang ◽  
Kun Liu ◽  
Fei Fei Dong ◽  
Sheng Li Zhang ◽  
Jun Jun Liu
Keyword(s):  
Yellow River ◽  
High Strength ◽  
The Yellow River ◽  
Primary Reason ◽  
Large Area ◽  
Rainfall Condition ◽  
Yield Increase ◽  
Water And Sediment ◽  
Long Time ◽  
Sharp Cutoff

This paper analyzes the circumstance of the sharp cutoff of water and sediment in He-Long reach recently, discusses the cause of the change of water and sediment. The study shows that, the change of underling surface and the rainfall without runoff are the primary reason for the sharp cutoff of water and sediment, if the rainfall condition changes, especially under the rainstorm which in the large area, with high strength and last for long time, the accumulated and secluded sediments could make the sediment yield increase sharply, the circumstance of sharp cutoff of water and sediment would change.

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.

Equilibrium relations for water and sediment transport in the Yellow River

2021 ◽  
Vol 36 (2) ◽  
pp. 328-334
Author(s):  
Xujian Chen ◽  
Yuqi An ◽  
Zhihao Zhang ◽  
Chunhong Hu
Keyword(s):  
Sediment Transport ◽  
Yellow River ◽  
The Yellow River ◽  
Water And Sediment
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