Unsaturated Soil Mechanical Strength Experiment Study for the Yellow Levee

2010 ◽  
Vol 36 ◽  
pp. 167-175 ◽  
Author(s):  
Yan Lan ◽  
Jun Xia Zhang ◽  
Min Zhang ◽  
Shou Gang Zhao
Keyword(s):  
Unsaturated Soil ◽  
Yellow River ◽  
The Yellow River ◽  
Experiment Study ◽  
Flood Season ◽  
Mechanical Experiment ◽  
Soil Shear Strength ◽  
Slope Collapse ◽  
Main Factors ◽  
River Dike

The soil unsaturated property is one of the main factors happening dike dangers such as craze and hole, even seriously slope collapse in the Yellow River dike. Based on the study of unsaturated mechanical experiment, the soil shear strength model formula can be proposed , and the changing rule of unsaturated soil mechanical properties be investigated for the typical levee soil of the Yellow River. It can provide theoretical and technical support for preventing the dike danger occurring, reducing the danger rate during the flood season, and establishing defend methods and instructing flood-defended.

Research on Optimal Index Set Based on Consequence-Reverse-Diffusion Method of Yellow River Downstream Embankment

2014 ◽  
Vol 955-959 ◽  
pp. 3020-3025
Author(s):  
Feng Feng ◽  
Hong Tao Jia ◽  
Xiao Ming Rong
Keyword(s):  
Index System ◽  
Influence Factor ◽  
Yellow River ◽  
Influence Factors ◽  
Safety Evaluation ◽  
Diffusion Method ◽  
The Yellow River ◽  
Index Set ◽  
Main Factors ◽  
River Embankment

Constructing a scientific, reasonable, all-encompassing, and representative-strong index system is an important premise and guarantee for the good embankment-safety-evaluation of Yellow River. Therefore, the embankment safety-influencing-factor identification has been raised based on consequence-reverse-diffusion method, which can be used to seek the main factors leading to accidents by reverse-thinking and reverse-diffusion way. The main factors which lead to the embankment accident shall be found out according to the accident form, then spreading to the specific influence-factor. As a result, the author has made a classification and extraction for the identified safety-influence-factors, and constructed the optional index-set and index-system for the Yellow River embankment-safety-evaluation after analyzing the content of the safety-influence-factors, which has laid a solid foundation for further embankment safety assessment for the Yellow River embankment construction.

scholarly journals Evaluation of Water Quality and Heavy Metals in Wetlands along the Yellow River in Henan Province

2020 ◽  
Vol 12 (4) ◽  
pp. 1300 ◽  
Author(s):  
Hong ◽  
Zhao ◽  
Chang ◽  
Peng ◽  
Wang ◽  
...  
Keyword(s):  
Water Pollution ◽  
Heavy Metals ◽  
Water Quality ◽  
Heavy Metal ◽  
Yellow River ◽  
Spatiotemporal Variation ◽  
The Yellow River ◽  
Lower Yellow River ◽  
Heavy Metal Concentrations ◽  
Flood Season

Assessing spatiotemporal variation in water quality and heavy metals concentrations in wetlands and identifying metal contamination source are crucial steps for the protection and sustainable utilization of water resources. Using the water quality identification index (Iwq), heavy metal pollution index (HPI), hierarchical cluster analysis (HCA) and redundancy analysis (RDA), we evaluated spatiotemporal variation in water quality and heavy metals concentrations, and their interrelation in wetlands along the middle and lower Yellow River. The average Iwq was highest during flood season but the average HPI was lowest in the same season. Meanwhile, the trend in mean HPI across three hydrological seasons was the opposite to that of mean Iwq. There was significant variation in wetlands water pollution status across seasons. During the flood season, the wetlands in the affected area with hanging river were seriously polluted. In other seasons, pollution in the artificial wetlands was even more severe. Moreover, serious pollution of wetlands in belt transect #03 (Yuanyang-Zhongmu) was more frequent. Dissolved oxygen and chemical oxygen demand strongly influenced heavy metal concentrations, while other water quality parameters had different influences on heavy metal concentrations in different hydrological seasons. The causes of water pollution were divided into natural factors and human disturbance (with potential relationships between them). The polluted wetlands were greatly affected by the Yellow River during the flood season while they were more impacted by agricultural and domestic sewage discharge in other seasons. However, heavy metal deposition and leaching into riparian wetlands were still affected by diverse channel conditions. If this trend is allowed to continue unabated, wetlands along the middle and lower Yellow River are likely to lose their vital ecological and social functions.

scholarly journals Using systems thinking to study the coordination of the water–sediment–electricity coupling system: a case study on the Yellow River

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yuansheng Zhang ◽  
Zhiwei Cao ◽  
Wei Wang ◽  
Xin Jin
Keyword(s):  
Systems Thinking ◽  
Yellow River ◽  
Activity Level ◽  
The Yellow River ◽  
Entropy Weight ◽  
Flood Season ◽  
Irrigation Period ◽  
Electricity System ◽  
Coupling System ◽  
Entropy Weight Method

AbstractJoint operation of the Longyangxia and Liujiaxia reservoirs (Long-Liu operation) is of great significance for water and sediment regulation in the Yellow River. The water–sediment–electricity coupling system is a giant system with complex nonlinear relationships. A reliable Long-Liu operation scheme facilitates maximization of the benefits of the water–sediment–electricity system. Based on systems thinking, this paper quantitatively evaluated the reliability of different Long-Liu operation schemes and coordination of the water–sediment–electricity coupling system through the entropy weight method and dissipative structure model. The results indicated that the current operation scheme is more reliable than the adjusted scheme at the inter-annual scale and during the summer-autumn flood season and ice flood season within a year. However, the operation scheme should be improved during the spring irrigation period. The key factors influencing the quality of the water–sediment–electricity system include the outflow of the Liujiaxia reservoir, incoming sediment load into the Yellow River at Toudaoguai, sediment inflow-outflow difference in the Ningxia-Inner Mongolia Reach, water flow at Lanzhou and power generation upstream of Toudaoguai. The water–sediment–electricity system under the current Long-Liu operation scheme is more coordinated than that in the adjusted state, but the overall coordinated development of the system remains at a low activity level.

scholarly journals Theory and Practice of water and sediment regulation in flood season of Yellow River in 2018

2018 ◽  
Vol 246 ◽  
pp. 01048
Author(s):  
Yuanjian Wang ◽  
Enhui Jiang ◽  
Xinjie Li ◽  
Xin Wang
Keyword(s):  
Yellow River ◽  
Theory And Practice ◽  
Regulation System ◽  
The Yellow River ◽  
Long Distance ◽  
Sediment Control ◽  
Practical Applications ◽  
Flood Season ◽  
Water And Sediment ◽  
Water And Sediment Regulation

In recent years, the water and sediment pattern of the Yellow River has changed significantly, and a preliminary water and sediment regulation system was constructed. Based on a summary of the regulation principles of water and sediment in the Middle Yellow River, this paper proposes three key technologies to determine the water and sediment control thresholds, the artificial creation of a long-distance density current, and an engineering regulation for water and sediment control of the Yellow River. Taking the actual flood and sedimentation regulation of the Yellow River Basin in 2018 as an example, the practical applications of these relevant technologies are analyzed. This study provides an important theoretical and practical reference for the flood and sediment regulation of sediment-laden rivers in arid and semi-arid areas during flood season.

scholarly journals Analysis of Natural Streamflow Variation and Its Influential Factors on the Yellow River from 1957 to 2010

Water ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1155 ◽  
Author(s):  
Jie Wu ◽  
Zhihui Wang ◽  
Zengchuan Dong ◽  
Qiuhong Tang ◽  
Xizhi Lv ◽  
...  
Keyword(s):  
Yellow River ◽  
Climatic Factors ◽  
Influential Factors ◽  
Annual Precipitation ◽  
Series Data ◽  
The Yellow River ◽  
Annual Streamflow ◽  
Flood Season ◽  
Precipitation Decrease ◽  
The Impact

In this study, variation characteristics of hydrometeorological factors were explored based on observed time-series data between 1957 and 2010 in four subregions of the Yellow River Basin. For each region, precipitation–streamflow models at annual and flood-season scales were developed to quantify the impact of annual precipitation, temperature, percentage of flood-season precipitation, and anthropogenic interference. The sensitivities of annual streamflow to these three climatic factors were then calculated using a modified elasticity coefficient model. The results presented the following: (1) Annual streamflow exhibited a negative trend in all regions; (2) The reduction of annual streamflow was mainly caused by a precipitation decrease and temperature increase for all regions before 2000, whereas the contribution of anthropogenic interference increased significantly—more than 45%, except for Tang-Tou region after 2000. The percentage of flood-season precipitation variation can also be responsible for annual streamflow reduction with a range of 7.36% (Tang-Tou) to 21.88% (Source); (3) Annual streamflow was more sensitive to annual precipitation than temperature in the humid region, and the opposite situation was observed in the arid region. The sensitivities to intra-annual climate variation increased after 2000 for all regions, and the increase was more significant in Tou-Long and Long-Hua regions.

Characteristics Identification of Runoff and Sediment Flux Based on Wavelet Analysis Approach in Lower Yellow River

2014 ◽  
Vol 700 ◽  
pp. 506-510
Author(s):  
Yu Zhi Shi ◽  
Ming Yuan Fan ◽  
Yu Yan Zhang ◽  
Hai Jiao Liu ◽  
Xiao Feng Yang
Keyword(s):  
Climate Change ◽  
Time Series ◽  
Wavelet Analysis ◽  
Yellow River ◽  
Sediment Flux ◽  
The Yellow River ◽  
Lower Yellow River ◽  
Multi Scale ◽  
Flood Season ◽  
Water And Sediment

Due to the influences of climate change and human activities, the water and sediment flux of the Yellow River are certainly changing. This paper selects monthly time series of runoff and sediment flux from 1950 to 2009 for study at Lijin station, in lower Yellow River. A widely used identification method, wavelet analysis, is applied for recognizing changing point and cycle of the runoff and sediment respectively in multi-scale of annual, flood season and non-flood season. The results indicate that there are two significant changing points in 1985, 2002 year, and cycle recognized results are different in multi-scale as well as with different hydrology factors.

Assessing soil erosion and control factors by radiometric technique in the source region of the Yellow River, Tibetan Plateau

2014 ◽  
Vol 81 (3) ◽  
pp. 538-544 ◽  
Author(s):  
Yibo Wang ◽  
Fujun Niu ◽  
Qingbai Wu ◽  
Zeyong Gao
Keyword(s):  
Soil Erosion ◽  
Tibetan Plateau ◽  
Vegetation Cover ◽  
Soil Loss ◽  
Yellow River ◽  
Source Region ◽  
The Yellow River ◽  
The Tibetan Plateau ◽  
Erosion Rates ◽  
Main Factors

AbstractMeasurements of 137Cs concentration in soils were made in a representative catchment to quantify erosion rates and identify the main factors involved in the erosion in the source region of the Yellow River in the Tibetan Plateau. In order to estimate erosion rates in terms of the main factors affecting soil loss, samples were collected taking into account the slope and vegetation cover along six selected transects within the Dari County catchment. The reference inventory for the area was established at a stable, well-preserved, site of small thickness (value of 2324 Bq·m− 2). All the sampling sites had been eroded and 137Cs inventories varied widely in the topsoil (14.87–25.56 Bq·kg− 1). The effective soil loss values were also highly variable (11.03–28.35 t·km− 1·yr− 1) in line with the vegetation cover change. The radiometric approach was useful in quantifying soil erosion rates and examining patterns of soil movement.

An Experiment Study of Erosion Characteristics of Sediment Bed at the Yellow River Delta

2007 ◽  
Vol 49 (1) ◽  
pp. 25-43 ◽  
Author(s):  
Shi Lianqiang ◽  
Li Jiufa ◽  
Dong Ping ◽  
Ying Ming ◽  
Li Weihua ◽  
...  
Keyword(s):  
Yellow River ◽  
Yellow River Delta ◽  
River Delta ◽  
The Yellow River ◽  
Experiment Study ◽  
The Yellow River Delta ◽  
Sediment Bed
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