scholarly journals Study on the evolution law of density current in the Xiaolangdi Reservoir before the flood in 2018

2018 ◽  
Vol 246 ◽  
pp. 01050
Author(s):  
Xinjie Li ◽  
Yuanjian Wang ◽  
Shaojun Qu ◽  
Ting Wang ◽  
Kunpeng Li
Keyword(s):  
Flow Velocity ◽  
Water Level ◽  
Yellow River ◽  
The Yellow River ◽  
Density Current ◽  
Sediment Characteristics ◽  
Sediment Thickness ◽  
Evolution Law ◽  
Research Results ◽  
Xiaolangdi Reservoir

Sediment problems affect the operation life and comprehensive benefits of a reservoir. In response to the floods in the middle and upper reaches of the Yellow River, the Xiaolangdi Reservoir is subjected to preventative pre-discharge scheduling. Through a prototypical observation of the density current plunging zone of the Xiaolangdi Reservoir in 2018, we collected prototypical data of the water level, water-sediment characteristics, sediment thickness, thalweg points, and flow velocity, and analyzed the pre-dam distribution of density current and scouring-sedimentation characteristics during the flood dispatching period of the Xiaolangdi Reservoir. The research results promoted the understanding of the movement law of the density current of the Xiaolangdi Reservoir and the development of efficient sediment drainage technology for reservoirs.

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.

scholarly journals Study on Ecological Scheduling of the Xiaolangdi Reservoir Based on the Ecological Needs of Estuarine Fishes

2018 ◽  
Vol 246 ◽  
pp. 01045
Author(s):  
Shimin Tian ◽  
Yi Zhao ◽  
Yuanjian Wang ◽  
Enhui Jiang ◽  
Shoubing Yu
Keyword(s):  
Yellow River ◽  
River Estuary ◽  
The Yellow River ◽  
Large Reservoir ◽  
Lower Yellow River ◽  
The Lower Yellow River ◽  
Estuarine Fishes ◽  
Water Demands ◽  
Xiaolangdi Reservoir ◽  
Water Amount

The total water amount into the Yellow River estuary is significantly reduced with the construction of a series of reservoirs in the Yellow River, which has a lot of adversely effects on the fishes and fishery resources in the estuary. This research analyzes the impacts of the reservoirs on the runoff and discharge in the Lower Yellow River and the estuary, and pays more attention to the influences of the reduction of water amount on the estuarine ecology and fishes. As a large reservoir nearest to the estuary in the Lower Yellow River, the operation of Xiaolangdi Reservoir plays an important role on the ecological restoration of the lower reaches of the Yellow River and the estuary. Two ecological operation schemes are proposed based on the ecological demands of the estuarine fishes and the actual operation of the Xiaolangdi Reservoir in recent years. One scheme is proposed only on the basis of the estuarine ecological water demands and another scheme takes consideration of ecological water demands and the actual status of the water resources in the Lower Yellow River synthetically. Finally, the feasibility of the two schemes are analyzed according to the actual situation of water storage of the reservoirs in the Yellow River in 2017.

Modern sediment characteristics and accumulation rates from the delta front to prodelta of the Yellow River (Huanghe)

2016 ◽  
Vol 36 (4) ◽  
pp. 247-258 ◽  
Author(s):  
Liangyong Zhou ◽  
Jian Liu ◽  
Yoshiki Saito ◽  
Maosheng Gao ◽  
Shaobo Diao ◽  
...  
Keyword(s):  
Yellow River ◽  
The Yellow River ◽  
Accumulation Rates ◽  
Sediment Characteristics ◽  
Delta Front ◽  
Modern Sediment

Effects of Water Level and Salinity on Total Sulfur Contents in Salt Marsh Soils of the Yellow River Delta, China

Wetlands ◽  
2015 ◽  
Vol 36 (S1) ◽  
pp. 137-143 ◽  
Author(s):  
Qiongqiong Lu ◽  
Junhong Bai ◽  
Zhaoqin Gao ◽  
Junjing Wang ◽  
Qingqing Zhao
Keyword(s):  
Salt Marsh ◽  
Water Level ◽  
Yellow River ◽  
Yellow River Delta ◽  
River Delta ◽  
The Yellow River ◽  
Total Sulfur ◽  
The Yellow River Delta

Experimental study of sediment transport processes and size selectivity of eroded sediment on steep Pisha sandstone slopes

2020 ◽  
Author(s):  
Pan Zhang ◽  
Pingqing Xiao ◽  
Chunxia Yang
Keyword(s):  
Sediment Transport ◽  
Flow Velocity ◽  
Overland Flow ◽  
Yellow River ◽  
Transport Processes ◽  
The Yellow River ◽  
Size Selectivity ◽  
Coarse Sediment ◽  
Sediment Particles ◽  
Slope Flow

<p>The Pisha sandstone area on the Ordos Plateau of China is the primary source of coarse sediment of the Yellow River. Sediment size distribution and selectivity greatly affect sediment transport and deposition. Hence, sediment transport processes and size selectivity by overland flow on Pisha sandstone slopes were investigated in this study. Experiments were run with Pisha sandstone soil (bulk density of 1.35 g/cm<sup>3</sup>) under rainfall intensities of 87 and 133 mm/h with a 25° slope gradient, and the duration of simulated rainfall is 1 h. Sediment and runoff were sampled at 2-min intervals to examine the size distribution change of the eroded sediment. The particle composition, enrichment rate, fractal dimension, and time distribution characteristics of median grain size (d<sub>50</sub>) of eroded sediment were comprehensively analyzed. Statistical analyses showed that the erosion process of Pisha sandstone slope mainly transported coarse sediment. More than 40% of eroded sediment particles were coarse sediment, which will become the main sediment in the lower reaches of the Yellow River bed. The particle size of eroded sediment tended to gradually decrease with the continuous rainfall but remained larger than the background value of Pisha sandstone soil after refinement. The fractal dimension was positively correlated with the slope flow velocity, while the d<sub>50</sub> was negatively correlated with the slope flow velocity. Overall, these findings show a strong relationship between the sediment transport and flow velocity, which indicates that the selectivity and transportation of sediment particles on the Pisha sand slopes is mainly influenced by the hydrodynamic parameters of overland flow. This study provides a methodology and data references for studying the particle selectivity characteristics of eroded sediment and provides a scientific basis for revealing the mechanism of erosion and sediment yield in the Pisha sandstone area of China.</p>

Flow and Sedimentation Characteristics on Typical Tributary in Xiaolangdi Reservoir on Yellow River

2014 ◽  
Vol 641-642 ◽  
pp. 175-178 ◽  
Author(s):  
Tao Li ◽  
Jun Hua Zhang ◽  
Guo Ming Gao ◽  
Ting Wang
Keyword(s):  
Storage Capacity ◽  
Yellow River ◽  
Longitudinal Profile ◽  
The Yellow River ◽  
Critical Position ◽  
Xiaolangdi Reservoir ◽  
Multipurpose Dam

Located at the exit of the last gorge of the middle reaches of the Yellow River, the Xiaolangdi Multipurpose Dam Project occupies a critical position in controlling both runoff and sediment of the River. typical tributary Zhenshui is the biggest tributary of Xiaolangdi Reservoir and its original storage capacity is 1.767 billion m3.This paper shows the process of the longitudinal profile of tributary Zhenshui,which faces the serious sediment bar growth at its mouth. Discussion is processed to show the possibility.

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