Analysis of Inflow Design Flood for Liujiaxia Reservoir under Dynamic Operation of Flood Limited Water Level for Ten-Day Period

2012 ◽  
Vol 212-213 ◽  
pp. 725-730
Author(s):  
Ji Qing Li ◽  
Di Shen ◽  
Ai Jing Wang ◽  
Yu Shan Zhang
Keyword(s):  
Water Level ◽  
Flood Control ◽  
Yellow River ◽  
Main Stream ◽  
Design Flood ◽  
Joint Operation ◽  
Cascade Hydropower Stations ◽  
Storage Area ◽  
Hydropower Stations ◽  
Flood Limited Water Level

the layout and the characteristics of the cascade reservoirs and hydropower stations in the upper reaches of the Yellow River, determine that cascade hydropower stations scheduling must be operated based on the joint operation between Longyangxia and Liujiaxia cascade hydropower stations, especially on flood control operation. This paper deeply analyzes design flood storage area of the Liujiaxia composition and Longyangxia-Liujiaxia joint flood regulating principle on the basis of analyzing and calculating each ten-day design flood of the Tangnaihai above main stream and the intervals. Therefore, the reasonable combination of interval flood and the process of Longyangxia reservoir flood discharge is confirmed, and thereby, studying Liujiaxia reservoir inflowing design flood under a controlling operation of flood limited water level for a period of ten-day to ensure the safety of Liujiaxia reservoir flood control.

scholarly journals A hydrodynamic model coupled multiple scenarios for plain river network and its application

2018 ◽  
Vol 246 ◽  
pp. 01016
Author(s):  
Zhiqiang Zeng ◽  
Ji Liang ◽  
Mingxiang Yang ◽  
Zhaocai Zeng ◽  
Yu Lang
Keyword(s):  
Water Level ◽  
Flood Control ◽  
Water Storage ◽  
River Network ◽  
Runoff Simulation ◽  
Simulation Accuracy ◽  
Storage Effects ◽  
Storage Area ◽  
Multiple Scenarios ◽  
Flood Diversion

The plain river network is not only complex in shape but also contains many complex scenarios, such as interval inflow and outflow, hydraulic structures and water storage area, etc., which increases the difficulty of runoff simulation in plain river network. To address this problem, a hydrodynamic (HD) model coupled multiple scenarios that may occur in plain river network was proposed, which was used to simulate the runoff process of the plain river network. To illustrate the proposed model, Xi River was chosen as a study area. We designed some experiments for each scenario, and the experimental results show that simulation results have good consistency with the observation. It is worth noting that the simulation accuracy of the water level is always higher than the simulation accuracy of the flow. Moreover, the runoff simulation accuracy of runoff events with large runoff is relatively high. It turns out that HD model is suitable for runoff simulation of plain river network. In addition, we compared the flood diversion effects of water storage area and sluice, and the results show that the effect of water storage area is more obvious than sluice, and the flood diversion method combined with sluice and water storage area has better flood diversion effect. In conclusion, HD model is good at simulating floodplain storage effects, backwater and the change of water level and flow under the condition of engineering dispatching, which has important guiding significance for flood control in plain river network.

scholarly journals Research Progress on Causes and natural cut-off of distorted river bends

2018 ◽  
Vol 246 ◽  
pp. 01095
Author(s):  
ZHAO Wanjie ◽  
XU Linjuan ◽  
LI Junhua ◽  
WANG Yuanjian ◽  
JIANG Enhui
Keyword(s):  
Flood Control ◽  
Yellow River ◽  
Research Progress ◽  
Main Stream ◽  
Control Engineering ◽  
The Lower Yellow River ◽  
River Bed ◽  
Plane Shape ◽  
River Bends ◽  
Important Position

In recent years, the distorted river bends occurs frequently in the lower reaches of the Yellow River, and the critical catastrophe occurs of natural cut-off under the action of flood scouring during flood season, which directly affects the plane shape of the river channel and the flood control safety of local reach. By collecting a large number of literature and combining existing research results, the causes of the deformed rivers and the natural cutting phenomenon are reviewed. The formation of the distorted river bends is mainly related to the incompatibility of the upstream water and sediment inflow conditions with the river boundary conditions, the formation of local anti-scour nodes (such as clay mouth) and the emergence or control engineering, and the different anti-scour properties of the riverbed leading to the main stream swing. In the development and evolution process of river bays, natural cutting curve occupies an important position, and there are three typical forms, such as erosion ditch type, bank collapsing type and die cutting type, and its cutting ratio is 1.6-6.9. In the future, we should study the composition of the river bed, study the causes and mechanism of the abnormal river regime in the lower Yellow River more deeply, predict the trend of the abnormal river regime scientifically, and evaluate the damage.

Study on the Effect of Regulation Project of Bifurcation on Flow Characteristics of Sink Reach of River Flowing into the Lake

2013 ◽  
Vol 791-793 ◽  
pp. 2188-2191
Author(s):  
Jun Chen ◽  
Ai Feng Huang ◽  
Gao Hu Sun ◽  
Yong Tao Li
Keyword(s):  
Water Level ◽  
Flood Control ◽  
Flow Characteristics ◽  
Stream Line ◽  
Main Stream ◽  
Left Bank ◽  
Maximum Increase ◽  
Maximum Reduction ◽  
Two Dimensional Flow ◽  
The Right

In order to research on the influence of regulation project, a two-dimensional flow mathematical model was adopted, and the change of diversion ratio, main stream line, water level, velocity of sink reach of river flowing into the lake were analyzed, the results were shown as follows: if the project built, the main stream line of bifurcation would move to the left side, and the diversion ratio of which would be increased by 0.54%. At the left side of the bifurcation, the water level would reduce obviously, and the maximum reduction of which would be 0.178m, and the velocity would increase, and maximum increase of which would be 1.0m/s. At the right side of the bifurcation, the water level would raise and the velocity would reduce, and the maximum reduction of which would be 1.667m/s. The point where water flow colliding with the left bank would change, and the velocity of point would be increased by 0.413m/s. The flow pattern would be smooth-going, the navigation condition of river would be improved, and the effect of project on flood control would be less.

Analysis and Prediction for Xiaolangdi Reservoir Sand Blocking Operation Period and Water Level of the Lower Yellow River

2011 ◽  
Vol 71-78 ◽  
pp. 1318-1323 ◽  
Author(s):  
Qing An Li ◽  
Han Dong Liu ◽  
Yu Kun Zhao
Keyword(s):  
Water Level ◽  
Flood Control ◽  
Yellow River ◽  
River Channel ◽  
The Yellow River ◽  
Deposition Condition ◽  
Reservoir Water ◽  
Specific Flow ◽  
Operation Period ◽  
Xiaolangdi Reservoir

Xiaolangdi Reservoir undertakes 90% of the Yellow River runoff and 100% of sediment discharge. To ensure the long-term utilization of Xiaolangdi reservoir is the key to prevent the flood in the lower reaches of the Yellow River. Take Luokou Hydrologic Station located in the lower reaches of the Yellow River as an example, conduct an analysis from the aspects of sediment retaining of Xiaolangdi Reservoir, scouring and deposition condition of river channel in the lower reaches of the Yellow River, water level performance for years of different flow of ten times’ water-sediment regulation, predict on the sand blocking operation period of Xiaolangdi Reservoir, water level of specific flow of river channel in the lower reaches of the Yellow River and scouring and deposition condition of river channel, which has played a reference role for the flood control in the lower reaches of the Yellow River.

Study on Drag Reduction of Suspended Flow with Extra Fine Sediment

2010 ◽  
Vol 439-440 ◽  
pp. 1567-1571
Author(s):  
Chang Jun Zhu
Keyword(s):  
Drag Reduction ◽  
Water Level ◽  
Flood Control ◽  
Yellow River ◽  
Reduction Rate ◽  
Fine Sediment ◽  
Flood Peak ◽  
The Lower Yellow River ◽  
Abnormal Phenomenon ◽  
Xiaolangdi Reservoir

In view of the abnormal phenomenon that a flood peak increased in August 2004 and July 2005 along the lower Yellow River, the mechanism of this abnormal phenomenon is studied. It is found that the flood increase was due to the decrease the channel roughness in the propagation of high concentrated flood carrying the extra fine sediment which was discharged from xiaolangdi reservoir. In view of this, the equation of drag reduction rate is derivated under variable k pattern, and is applied to the reality. The results show that the equation is reliable and has important role in flood control and calculation in water level with hyperconcentration flow. The study of this paper only is a try and discuusion, and need to be improved.

scholarly journals Influence of Floodplain Flooding on Channel Siltation Adjustment under the Effect of Vegetation on a Meandering Riverine Beach

Water ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1402
Author(s):  
Li Junhua ◽  
Zhang Mingwu ◽  
Jiang Enhui ◽  
Pan Li ◽  
Wang Aoxue ◽  
...  
Keyword(s):  
Model Test ◽  
Flood Control ◽  
Yellow River ◽  
Main Channel ◽  
Experimental Simulation ◽  
Theoretical Research ◽  
Main Stream ◽  
Compound Channel ◽  
Water And Sediment ◽  
Beach Vegetation

Flooding in a sediment-laden floodplain is affected by riverine beach vegetation and the shape of a meandering compound channel. The laws of water and sediment exchange and the deposition distribution in beach troughs are very complex. These factors play a significant role in the formation and development of secondary suspended rivers, in the adjustment of the beach horizontal gradient, and even in the evolution of the flood control situation. In this study, we used a combination of experimental simulation and theoretical research to carry out a generalized model test of floodplain flooding evolution, analyzed the lateral distribution characteristics of sediment-laden flow and sediment factors in a meandering compound channel under the conditions of beach vegetation, and revealed the pros and cons of beach vegetation on the adjustment of the beach and channel siltation. The model test results of the flooding in the floodplain in the compound channel with meandering vegetation showed that the main stream was not only concentrated in the main channel but also appeared near the foot of the left and right bank levees and formed flood discharges along the embankment. As the riverine beach siltation was mainly concentrated at the riverine beach lip, the vegetation on the riverine beach had a significant effect on slowing down the flow velocity. Whether it was a row or full vegetation on both sides of the bank, this played an important role in the stability of the main channel. When there was no vegetation on the riverine beach, the main channel was easy to move. The arrangement of full vegetation on the riverine beach had a uniform effect on the velocity distribution of the riverine beach, which reduced the phenomenon of excessive velocity at the foot of the riverine beach and increased the velocity effect in the main channel. These results will provide a theoretical basis for the utilization of riverine beach areas and river management in the lower Yellow River and have a great significance for enriching the basic theory of water and sediment movement and promoting the integration of hydraulics, river dynamics, and ecology.

scholarly journals An Improved Slime Mold Algorithm and its Application for Optimal Operation of Cascade Hydropower Stations

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 226754-226772
Author(s):  
Trong-The Nguyen ◽  
Hong-Jiang Wang ◽  
Thi-Kien Dao ◽  
Jeng-Shyang Pan ◽  
Jian-Hua Liu ◽  
...  
Keyword(s):  
Optimal Operation ◽  
Slime Mold ◽  
Cascade Hydropower Stations ◽  
Hydropower Stations
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