Experimental Research on Preventing Root-Stones Loss with Tetrahedron-Like Concrete Penetrating Frames

2011 ◽  
Vol 233-235 ◽  
pp. 1930-1934
Author(s):  
Jie Shi ◽  
Xiao Lei Zhang ◽  
Zun Xin Huang
Keyword(s):  
Water Flow ◽  
Experimental Research ◽  
Flood Control ◽  
Yellow River ◽  
The Yellow River ◽  
Direct Impact ◽  
The Lower Yellow River ◽  
Scour Holes ◽  
Protection Technology ◽  
Flood Diversion

The root-stones loss for flood control project is serious in the Lower Yellow River, and the tetrahedron-like concrete penetrating frame is a new protection technology. The Experiment on preventing root-stones loss of flood diversion and regulation works in Taohuayu with tetrahedron-like concrete penetrating frames in the Xingyang reach of the Yellow River. The experiment results show that: (1) the technology of tetrahedron-like concrete penetrating frame is simple, and it can make root-stones very steady; (2) the tetrahedron-like concrete penetrating frame can effectively reduce the depth of scour holes in front of dam and slow the direct impact of water flow on the dam body; (3) the tetrahedron-like concrete penetrating frame can effectively reduce root-stones loss and save lots of stones; (4) the tetrahedron-like concrete penetrating frames could be made use of for the project foundation stabilization, and they are thrown into the slope of root-stones and the riverbed outside slope toe within a certain width to increase the effect of root-stones protection better.

Experimental Research on Solidifying Sediment in Irrigation Districts along the Lower Yellow River

2012 ◽  
Vol 598 ◽  
pp. 585-589
Author(s):  
Liang Ma ◽  
Xiao Mei Li ◽  
Rui Juan Zhang
Keyword(s):  
Compressive Strength ◽  
Experimental Research ◽  
Yellow River ◽  
The Yellow River ◽  
Curing Agent ◽  
Lower Yellow River ◽  
The Lower Yellow River ◽  
Irrigation Districts ◽  
Water Conservancy ◽  
Wall Construction

Based on the analysis of physical characteristics about the desilting sediment diverted from the Yellow River in irrigation districts, the solidified sediment product was successfully manufactured. In the research, it was found that the cement dosage as one of the mixed curing agent had obvious influence on the properties of solidified sediment product. As the compressive strength, impermeability and frost-resistanceproducts of the product meet the requirement of moderate water conservancy engineering, it was successfully applied in the Sanfengan Canal lining and the Yanglanhe Reservoir wave wall construction, which set a good example for the future comprehensive sediment utilization in irrigation districts.

scholarly journals High-Arsenic Groundwater in Paleochannels of the Lower Yellow River, China: Distribution and Genesis Mechanisms

Water ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 338
Author(s):  
Chuanshun Zhi ◽  
Wengeng Cao ◽  
Zhen Wang ◽  
Zeyan Li
Keyword(s):  
Yellow River ◽  
The Yellow River ◽  
Rock Interaction ◽  
Lower Yellow River ◽  
The Lower Yellow River ◽  
Groundwater Samples ◽  
Groundwater Systems ◽  
Different Sources ◽  
High Arsenic ◽  
High Arsenic Groundwater

High–arsenic (As) groundwater poses a serious threat to human health. The upper and middle reaches of the Yellow River are well–known areas for the enrichment of high–arsenic groundwater. However, little is known about the distribution characteristics and formation mechanism of high-As groundwater in the lower reach of the Yellow River. There were 203 groundwater samples collected in different groundwater systems of the lower Yellow River for the exploration of its hydrogeochemical characteristics. Results showed that more than 20% of the samples have arsenic concentrations exceeding 10 μg/L. The high-As groundwater was mainly distributed in Late Pleistocene–Holocene aquifers, and the As concentrations in the paleochannels systems (C2 and C4) were significantly higher than that of the paleointerfluve system (C3) and modern Yellow River affected system (C5). The high-As groundwater is characterized by high Fe2+ and NH4+ and low Eh and NO3−, indicating that reductive dissolution of the As–bearing iron oxides is probably the main cause of As release. The arsenic concentrations strikingly showed an increasing tendency as the HCO3− proportion increases, suggesting that HCO3− competitive adsorption may facilitate As mobilization, too. In addition, a Gibbs diagram showed that the evaporation of groundwater could be another significant hydrogeochemical processes, except for the water–rock interaction in the study area. Different sources of aquifer medium and sedimentary structure may be the main reasons for the significant zonation of the As spatial distribution in the lower Yellow River.

scholarly journals Evaluation of Environmental and Ecological Impacts of the Leading Large-Scale Reservoir on the Upper Reaches of the Yellow River

2019 ◽  
Vol 11 (14) ◽  
pp. 3818
Author(s):  
Jun Qiu ◽  
Tie-Jian Li ◽  
Fang-Fang Li
Keyword(s):  
Flood Control ◽  
Large Scale ◽  
Yellow River ◽  
Yellow River Basin ◽  
Water Area ◽  
Economic Benefits ◽  
Control Area ◽  
Ecological Impacts ◽  
The Yellow River ◽  
Water Demands

Large-scale reservoirs have played a significant role in meeting various water demands and socio-economic development, while they also lead to undeniable impacts on the environment and ecology. The Longyangxia reservoir located on the Yellow River is the first large-scale reservoir on the upper Yellow River with a control area of 18% of the entire Yellow River Basin. Since it was put into operation in 1987, it has made great contributions to the national economy for over 30 years. In this study, the socio-economic benefits of the Longyangxia reservoir in power generation, water supply, flood control, and ice prevention are investigated. More importantly, its impacts on the ecology and environment are also presented and analyzed, such as the impacts on river morphology, flow regimes, peak flow, fish, phytoplankton, and zooplankton. It can be concluded that the construction of the Longyangxia reservoir contributes greatly to socio-economic benefits, the water area nearby has formed a new ecological environment, and the trophic level of the aquatic environment has probably increased.

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.

Experimental Research on Mechanical Calculation of Fascine Object’s Underwater Falling

2011 ◽  
Vol 84-85 ◽  
pp. 204-208
Author(s):  
Jie Shi ◽  
Xiao Lei Zhang ◽  
Su Ting Yang
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Experimental Research ◽  
Yellow River ◽  
The Yellow River ◽  
Mechanical Calculation ◽  
River Bed ◽  
Calculation Results

Fascine objects can be applied in the process of emergency rescues in the Middle and Lower reaches of the Yellow River. Because fascine objects can improve the efficiency of rushing to deal with an emergency, adapt to changes in river bed conditions better, resist the erosion of water slide on riverbank and buttress and prevent the collapse of the embankment, they are applicable to rescuing grave dangerous situations such as river closure, advancing construction dams in waters, closing up levee breaches and so on. Based on the experimental study, the authors analyze the mechanical calculation results of fascine object’s underwater falling, and draw the relevant mechanical properties of fascine object’s underwater falling.

Application of MIKE21 MODEL on Flood Routing in the Lower Yellow River from Gaocun to Sunkou

2012 ◽  
Vol 238 ◽  
pp. 304-307
Author(s):  
Xiao Lei Zhang ◽  
Shao Lei Guo
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Water Flow ◽  
Yellow River ◽  
Reference Value ◽  
Flood Routing ◽  
Lower Yellow River ◽  
The Lower Yellow River ◽  
Flow Parameters ◽  
Boundary Treatment

The 2-D water flow mathematical model based on MIKE 21 software which reflects flood routing in the reach from Gaocun to Sunkou has been developed in this paper. Through the numerical simulation of the “96.8” typical flood, the simulating results in the condition of present topography are agreement with the measured ones. It shows that this model is basically reasonable in the selection aspects of river terrain, boundary treatment, roughness and water flow parameters, and the model has a reference value for simulating flood routing in the Lower Yellow River.

Numerical Simulation and Experimental Research of Icicles under the Single Point of Blasting in the Yellow River

2014 ◽  
Vol 501-504 ◽  
pp. 2020-2025 ◽  
Author(s):  
Wen Yuan Meng ◽  
Guan Chao Xu ◽  
Jia Qing Li ◽  
Guan Chun Xu ◽  
Jun Wei Guo ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Field Test ◽  
Working Conditions ◽  
Experimental Research ◽  
Calculation Result ◽  
Yellow River ◽  
Single Point ◽  
The Yellow River ◽  
Water Medium ◽  
Different Thickness

Blasting model of ice is established by ANSYS-LSDYNA in this paper. By using LS-PREPOST, the author analyzes the broken volume or diameter of ice in different working conditions, including the buried depth of explosive, the load and the thickness of ice. ORIGN drawing software is used to analyze the most suitable blasting location with different thickness of ice. The result shows that when the thickness is between 20cm and 60cm, the best blasting coefficient of water-medium ice is K=R/ H =0.5~1. It also shows that the explosive effect will be better when it is exploded under ice layer than in the middle or at the surface of ice layer. Calculation result and field test align fairly well. By simulating blasting parameter in different working conditions, ice prevention database is built, providing references for designers to develop a series of shaped into ice equipments. It also has important practical meaning to use various equipments to prevent and treat ice disasters of the Yellow River.

scholarly journals Spatial and Temporal Agglomeration Characteristics and Coupling Relationship of Urban Built-Up Land and Economic Hinterland—A Case Study of the Lower Yellow River, China

2019 ◽  
Vol 11 (19) ◽  
pp. 5218 ◽  
Author(s):  
Yunfeng Cen ◽  
Pengyan Zhang ◽  
Yuhang Yan ◽  
Wenlong Jing ◽  
Yu Zhang ◽  
...  
Keyword(s):  
Yellow River ◽  
Distribution Patterns ◽  
Coupling Model ◽  
Transformation Process ◽  
The Yellow River ◽  
Geographic Concentration ◽  
The Lower Yellow River ◽  
Temporal Coupling ◽  
Coupling Mode ◽  
Relationship Of

Clarifying the development relationship between urban built-up land and economic hinterland can provide decision support for regional sustainable development. Using the improved field model, geographic concentration and elasticity coefficient, and taking the lower reaches of the Yellow River as the study area, this study defines the scope of urban economic hinterland in the lower reaches of the Yellow River in China from 2005 to 2017, further analyzes the dynamic process of urban built-up land agglomeration and economic hinterland agglomeration, and reveals the spatial–temporal coupling relationships of urban built-up land expansion and economic hinterland development. The results revealed the following: (1) From 2005 to 2017, the spatial and temporal change pattern of the economic hinterland of each city in the lower reaches of the Yellow River had basically the same trend, showing a low degree of coincidence with the administrative divisions and obvious differences in scope and change; (2) The geographic concentration of built-up land showed a trend of centering on the cities of Zhengzhou and Jinan, spreading to the periphery, and gradually forming a high-value contiguous area in both cities. The spatial distribution patterns of the geographic concentration of economic hinterland are mainly manifested in Zhengzhou and Jinan, showing a circle structure of areas with “highest-low-higher” concentrations of economic hinterland moving away from the urban center; (3) The spatial–temporal coupling between the expansion of urban built-up land and the development of economic hinterland underwent an obvious transformation process. From 2005 to 2011, the coupling mode was mainly growth, and, from 2011 to 2017, it began to shift to extensive and intensive development. The coupling model of urban built-up land and economic hinterland in the lower reaches of the Yellow River has a good trend.

Effect of Projects within River Courses on Flood Control through Superposition Calculation Method

2014 ◽  
Vol 641-642 ◽  
pp. 167-170
Author(s):  
Xin Liu ◽  
Feng Qun Wang ◽  
Juan Du ◽  
Li Qin Li
Keyword(s):  
Calculation Method ◽  
Flood Control ◽  
Yellow River ◽  
Water Area ◽  
The Yellow River ◽  
Actual Situation ◽  
River Floodplain ◽  
Floodplain Development ◽  
Scientific Decision ◽  
Control Management

Henan Yellow River floodplain is the area for flood flowing, flood detention and sand sediment; it is also necessary for the production and living. With the rapid economic development along the Yellow River, floodplain development is increasing, occupying some land and water area. Due to the lack of unified planning, they have brought certain difficulties to flood control management and scientific decision-making. This paper first proposed specific superposition scope and calculation method for projects within river courses. Compared with the previous single calculation of backwater and scouring, it more truly, accurately reflect the actual situation of projects within river courses.

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