scholarly journals Optimization of Drainage Schemes for the Dike Strengthening by Warping Construction Project in the Qinhe River under Restricted Drainage Condition

2018 ◽  
Vol 246 ◽  
pp. 02019
Author(s):  
Hao-Ming Yang ◽  
Min Zhang ◽  
Cheng-Hui Dong
Keyword(s):  
Field Test ◽  
Yellow River ◽  
Construction Project ◽  
The Yellow River ◽  
Test Results ◽  
Flood Prevention ◽  
Prevention Project ◽  
Drainage Effect ◽  
Key Indicators ◽  
Safety And Stability

Dike strengthening by warping construction is one of the main construction modes for the standardized dike construction of mainstream and tributaries in the lower reaches of the Yellow River, and whether the drainage in the dike strengthening by warping construction is smooth is closely related to the safety of dike project. Restricted by topographic conditions and construction conditions, existing drainage schemes are not applicable to the Qinhe River (the Yellow River’s largest tributary) Flood Prevention Project Wuzhi Section, which is next to farm cottage. Therefore, in this paper a field test was carried out using three drainage schemes---“L” type PVC seepage drainage pipes through dike, “L” type perforated PVC seepage drainage pipes coated with geotextile and geotextile drainage grilles. The drainage velocity, silt retaining effect, water level in the silt area, dike body deformation and other key indicators were obtained through field monitoring, and the safety and stability of the dike strengthening by warping construction project were verified by numerical calculation. The field test results showed that the drainage effect of the “L” type perforated PVC seepage drainage pipes coated with geotextile and geotextile drainage grilles was obviously better than that of the “L” type PVC seepage drainage pipes through dike, but the geotextile drainage grilles had advantages in silt retaining effect, construction convenience, cost, and improvement. The field test results can provide a reference for the quick drainage design and construction of dike back deposited with silt of the dike strengthening by warping construction project in the 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.

Research on the Field Test of Desilting and Bank-Strengthening for the Yellow River

2006 ◽  
Author(s):  
Yanqiang Chen ◽  
Xianwu Luo ◽  
Hongyuan Xu ◽  
Wei Shi
Keyword(s):  
Field Test ◽  
Flow Rate ◽  
Yellow River ◽  
Transportation System ◽  
The Yellow River ◽  
High Concentration ◽  
Long Distance ◽  
River Sand ◽  
Obvious Effect ◽  
The Cost

Due to the large amount of sand in the Yellow River water, the sediment accumulation of the sand in the lower reaches of the river has been increasing for years. In order to control the Yellow River flood, the height of the stream channel of this river should be decreased, and the banks have to be widened and its height should be increased. Desilting and bank-strengthening is an effective path to reinforce the banks of the Yellow River by taking advantages of the silt in the river appropriately. In the Desilting and bank-strengthening project, owing to the long distance of transportation of the sand, three parallel submersible liquid-solid pumps are operated together with one or two slurry pumps in series. This paper treats the field test of the Yellow River sand transportation system. Based on the on-site experiment, the relationship between the transportation efficiency and sand properties, the resistance of pipeline, etc has been investigated. It is noted that the amount of sand increased the resistance of pipeline, and sand concentration had obvious effect on transportation efficiency. With the same flow-rate, the larger sand concentration is, the less time is needed to transport the same amount of sand, and the less the cost of both power consumption and the consumption water would be; With the same sand concentration, the larger the flow-rate is, the larger the production output of sand transportation and economic profits would be achieved during the same operation period. Thus, the transportation system should be recommended to run in the condition of as large flow-rate and as high concentration as possible so that the working time and the cost of production would be reduced, and better economic performance was available.

scholarly journals The Microstructure of Yellow River Ice in the Freezing Period

Crystals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 484
Author(s):  
Yu Deng ◽  
Zongkun Li ◽  
Juan Wang ◽  
Lukai Xu
Keyword(s):  
Yellow River ◽  
Calculation Model ◽  
Theoretical Research ◽  
River Ice ◽  
The Yellow River ◽  
Test Results ◽  
Ice Crystal ◽  
Ice Surface ◽  
Ice Disaster ◽  
Ice Crystal Size

Accurately determining true ice microstructure and material parameters is a basis for ice disaster theoretical research on the Yellow River. In this work, natural Yellow River ice was collected, and ice crystals parallel and perpendicular to the ice surface were photographed using an orthogonal polarizing mirror. Morphologies of ice microstructure were extracted, and equivalent ice grain sizes were calculated. The results show that Yellow River ice mainly consists of granular ice and columnar ice and vary greatly in different time and space ranges. The ice crystal shape is irregular, and the ice crystal size is larger span, and mainly between 1 mm and 10 mm. Ice crystal initial defects come from bubbles, sediment particles, impurities, and microcracks; among them, bubbles are the most common and have a relatively large impact. In addition, a calculation model of the Yellow River ice microstructure was constructed according to the ice crystal test results. Based on the experimental data and numerical model, the obtained Yellow River ice parameters provide help for analyzing ice disaster mechanisms along the Yellow River.

Wetting Effects of Rockfill on the Deformation of the Yellow River Xiaolangdi Dam

2007 ◽  
Vol 353-358 ◽  
pp. 2736-2739
Author(s):  
Li Hong Chen ◽  
Xiao Guang Zhou ◽  
Yin Qi Wei
Keyword(s):  
Constitutive Model ◽  
Strength Characteristic ◽  
Laboratory Tests ◽  
Yellow River ◽  
The Yellow River ◽  
Two Dimensional ◽  
Test Results ◽  
Rockfill Dam ◽  
Nonlinear Stress

The deformation and strength characteristic of rockfill is different when it is dry or wet. The wetting effects should be a major factor in the long-term settlement of a rockfill dam. The 160 m high Yellow River Xiaolangdi dam is a rockfill dam with inclined core clay. Moistening laboratory tests were carried out to investigate the deformation and strength characteristic of the rockfill in the Xiaolangdi dam. Based on the test results, two-dimensional consolidation numerical simulations on the dam employed nonlinear stress strain constitutive model were conducted to investigate the effects of wetting on the deformation performance of the dam.

scholarly journals Flood season segmentation and scheme optimization in the Yellow River

2021 ◽  
Author(s):  
Ke Zhou
Keyword(s):  
Yellow River ◽  
Active Role ◽  
The Yellow River ◽  
Rational Analysis ◽  
Nonparametric Bootstrap ◽  
Flood Prevention ◽  
Flood Season ◽  
Segmentation Methods ◽  
Significant Measure ◽  
Partition Method

Abstract River flood season segmentation is a significant measure for flood prevention. This study aims to carry out theoretical analysis on flood season segmentation methods and put forward a framework for proper flood season segmentation through comparison between different segmentation methods. The studied framework consists of a Fisher optimal partition method for determining the optimum numbers of the sub-seasons, an ensemble approach for segmenting a defined flood season, and a nonparametric bootstrap combined with a fuzzy optimum selection method (NB-FOS) for testing the rationality of the flood season staging schemes. The present research findings show that different methods could result in different staging schemes. It is proved through rational analysis that the staging scheme obtained by probability change point (PCP) is superior to others. The flood season of the downstream reach of the Yellow River can be segmented into three sub-seasons, i.e. early flood season (01 June–20 July), main flood season (21 July–28 September), and late flood season (29 September–08 November). The segmentation results of the flood season should play an active role in flood prevention.

GEOMORPHOLOGICAL CHARACTERISTICS OF A TRANSECT FROM THE YELLOW RIVER TO THE IRON PAGODA IN KAIFENG CITY, CHINA

2018 ◽  
Vol 14 (1) ◽  
pp. 245-254 ◽  
Author(s):  
Yang LI ◽  
◽  
Zhixiang XIE ◽  
Fen QIN ◽  
Yaochen QIN ◽  
...  
Keyword(s):  
Yellow River ◽  
The Yellow River ◽  
Kaifeng City
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