scholarly journals A Study of the Water and Sediment Transport Laws and Equilibrium Stability of Fluvial Facies in the Ningxia Section of the Yellow River under Variable Conditions

2020 ◽  
Vol 12 (4) ◽  
pp. 1573
Author(s):  
Ximin Yuan ◽  
Zhichun Yue ◽  
Fuchang Tian ◽  
Lugan Cao ◽  
Tianhua Song
Keyword(s):  
Equilibrium State ◽  
Cross Sections ◽  
Large Scale ◽  
Yellow River ◽  
Actual State ◽  
The Yellow River ◽  
Water And Sediment ◽  
Water Conservancy ◽  
The Relationship ◽  
Cumulative Curves

Recently, construction of many large-scale water conservancy projects, as well as the vegetation protection and restoration projects in the upper reaches of the Yellow River, have led to serious changes in water inflow processes, sediment inflow processes, and scour and silting situation in the Ningxia section of the Yellow River (NSYR). This study explored the relationship between the sediment scouring and the silting law of the sediment-laden rivers and the equilibrium fluvial facies in the NSYR. The double cumulative curves of the annual silting amounts and annual incoming sediment amounts in the Qingtongxia–Shizuishan section were then established. It has been previously proven the fluvial facies coefficient increases year by year with the increase in the silting amounts in the watercourse, which lead to the evolution of the watercourse toward the wandering reach. The fluvial facies relationships of their cross-sections under an equilibrium state in the NSYR were established using a Yalin fluvial facies method. The Fr values under an equilibrium state and the actual state were analyzed. The results showed the Xiaheyan section was in an equilibrium state, and the Qingtongxia and Shizuishan cross-section were in a scouring state. This conclusion was confirmed by the actual measured results for numerous years.

Effect of Ecological Water Supplement on Land Use and Land Cover Changes in Diaokou River

2013 ◽  
Vol 864-867 ◽  
pp. 2403-2407 ◽  
Author(s):  
Guo Tao Dong ◽  
Kui Huang ◽  
Su Zhen Dang ◽  
Xiao Wei Gu ◽  
Wen Li Yang
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Large Scale ◽  
Yellow River ◽  
Yellow River Delta ◽  
The Yellow River ◽  
Land Cover Changes ◽  
Water And Sediment ◽  
Before And After ◽  
The Impact

Diaokou River is one of the old courses of the Yellow River access to the sea before 1976 and its estuarine delta is an important part of National Nature Reserve of Yellow River Delta. The Yellow River Conservancy Commission decided the ecological water supplement to the wetland during the water and sediment regulation period in 2010. In this study, we analyzed the land use and land cover changes before and after the ecological water supplement in Diaokou River by using HJ-1B CCD data. The impact of the ecological water supplement on land use and land cover changes in Diaokou River was remarkable. The expansion of shrub-grassland and water body at large scale is conspicuous, while decreasing areas of shallows was 15.03 km2 and unutilized land decreasing amplitude was 28%. The main area of land use change was in Yiqianer protected areas, where concentrated in the estuary of the Diaokou 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.

Water conservancy project on the Yellow River modifies the seasonal variation of Chlorophyll-a in the Bohai Sea

Chemosphere ◽  
2020 ◽  
Vol 254 ◽  
pp. 126846
Author(s):  
Xiaokun Ding ◽  
Xinyu Guo ◽  
Chao Zhang ◽  
Xiaohong Yao ◽  
Sumei Liu ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Chlorophyll A ◽  
Bohai Sea ◽  
Yellow River ◽  
The Yellow River ◽  
The Bohai Sea ◽  
Water Conservancy Project ◽  
Water Conservancy

scholarly journals Shield Equipment Optimization and Construction Control Technology in Water-Rich and Sandy Cobble Stratum: A Case Study of the First Yellow River Metro Tunnel Undercrossing

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Fei Ye ◽  
Nan Qin ◽  
Xiang Gao ◽  
Xue-yong Quan ◽  
Xian-zhuo Qin ◽  
...  
Keyword(s):  
Large Scale ◽  
Yellow River ◽  
Shield Tunnel ◽  
The Yellow River ◽  
Protective Device ◽  
Aperture Ratio ◽  
Metro Tunnel ◽  
Sand Pits ◽  
Cutter Head

The Lanzhou Yellow River Tunnel is the first metro shield tunnel that undercrosses the Yellow River in China. It was completed after successfully overcoming several construction challenges, including strata with a high proportion of large-sized sandy cobble stratum being saturated, large-scale sand pits along the bank of the Yellow River, and a combination of boulders and erratic blocks of rock. Given the difficulties in constructing the tunnel, this paper summarizes the scheme employed to transform the cutter and cutter head design to be applicable to sandy cobble stratum and the key technology used to form the slurry film to facilitate crossing the sand pits in a systematic way. The transformation scheme primarily involved the addition of an adjusting device to control the aperture ratio of the shield on the cutter head, a protective device for the hob hub, and a protective device for the piston rod in the oil cylinder of the crusher. The implementation of measures mentioned above guarantees the safe completion of the tunnel, which can provide a reference for similar projects.

Analysis for the Cause of Sharp Cutoff of Water and Sediment in He-Long Reach the Yellow River Middle Area

2012 ◽  
Vol 212-213 ◽  
pp. 272-277 ◽  
Author(s):  
Ling Ling Kang ◽  
Kun Liu ◽  
Fei Fei Dong ◽  
Sheng Li Zhang ◽  
Jun Jun Liu
Keyword(s):  
Yellow River ◽  
High Strength ◽  
The Yellow River ◽  
Primary Reason ◽  
Large Area ◽  
Rainfall Condition ◽  
Yield Increase ◽  
Water And Sediment ◽  
Long Time ◽  
Sharp Cutoff

This paper analyzes the circumstance of the sharp cutoff of water and sediment in He-Long reach recently, discusses the cause of the change of water and sediment. The study shows that, the change of underling surface and the rainfall without runoff are the primary reason for the sharp cutoff of water and sediment, if the rainfall condition changes, especially under the rainstorm which in the large area, with high strength and last for long time, the accumulated and secluded sediments could make the sediment yield increase sharply, the circumstance of sharp cutoff of water and sediment would change.

scholarly journals Study on the Relationship between Topological Characteristics of Vegetation Ecospatial Network and Carbon Sequestration Capacity in the Yellow River Basin, China

2021 ◽  
Vol 13 (23) ◽  
pp. 4926
Author(s):  
Minzhe Fang ◽  
Guoxin Si ◽  
Qiang Yu ◽  
Huaguo Huang ◽  
Yuan Huang ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Carbon Sequestration ◽  
River Basin ◽  
Yellow River ◽  
Yellow River Basin ◽  
The Yellow River ◽  
Carbon Neutrality ◽  
Vegetation Carbon ◽  
The Yellow River Basin ◽  
The Relationship

Achieving carbon neutrality is a necessary effort to rid humanity of a catastrophic climate and is a goal for China in the future. Ecological space plays an important role in the realization of carbon neutrality, but the relationship between the structure of vegetation ecological space and vegetation carbon sequestration capacity has been the focus of research. In this study, we extracted the base data from MODIS products and other remote sensing products, and then combined them with the MCR model to construct a vegetation ecospatial network in the Yellow River Basin in 2018. Afterward, we calculated the topological indicators of ecological nodes in the network and analyzed the relationship between the carbon sequestration capacity (net biome productivity) of ecological nodes and these topological indicators in combination with the Biome-BGC model. The results showed that there was a negative linear correlation between the betweenness centrality of forest nodes and their carbon sequestration capacity in the Yellow River Basin (p < 0.05, R2 = 0.59). On the other hand, there was a positive linear correlation between the clustering coefficient of grassland nodes and their carbon sequestration capacity (p < 0.01, R2 = 0.49). In addition, we briefly evaluated the vegetation ecospatial network in the Yellow River BASIN and suggested its optimization direction under the background of carbon neutrality in the future. Increasing the carbon sequestration capacity of vegetation through the construction of national ecological projects is one of the ways to achieve carbon neutrality, and this study provides a reference for the planning of future national ecological projects in the Yellow River Basin. Furthermore, this is also a case study of the application of remote sensing in vegetation carbon budgeting.

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