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.

Human disturbance and long-term changes in fish taxonomic, functional and phylogenetic diversity in the Yellow River, China

Hydrobiologia ◽  
2020 ◽  
Vol 847 (18) ◽  
pp. 3711-3725 ◽  
Author(s):  
Yintao Jia ◽  
Mark J. Kennard ◽  
Yuhan Liu ◽  
Xiaoyun Sui ◽  
Kemao Li ◽  
...  
Keyword(s):  
Human Disturbance ◽  
Phylogenetic Diversity ◽  
Yellow River ◽  
The Yellow River ◽  
Long Term Changes ◽  
Functional And Phylogenetic Diversity

Application of a Coupled Atmospheric and Hydrological Modelling System (AHMS) to the Yellow River Basin, China

2020 ◽  
Author(s):  
Cong Jiang ◽  
Eric J. R. Parteli ◽  
Yaping Shao
Keyword(s):  
River Basin ◽  
Yellow River ◽  
Yellow River Basin ◽  
Hydrological Modelling ◽  
The Yellow River ◽  
Hydrological Process ◽  
Daily Streamflow ◽  
The Yellow River Basin ◽  
Modelling System

<p>The Yellow River Basin (795,000 km<sup>2</sup>) in Northern China has been greatly affected by intensive human activity and climate change over the past decades. In this study, a coupled atmospheric and hydrological modelling system is applied to investigating the long-term hydrological cycle and short-term forecasting of hydrological events in the Yellow River Basin. This modelling system (AHMS) combines a hydrological model (HMS) with the Weather Research and Forecast model (WRF) and the Noah land surface scheme (NoahMP-LSM), which has been recently improved to account for topographic influences in the infiltration scheme and to allow for interactions between the unsaturated and saturated zones by applying the Darcy-flux boundary condition. Here, simulations are performed using the offline AHMS mode over the Yellow River Basin by considering a time span of 25 years (1979-2003) and a spatial resolution of 20 km. The NCEP reanalysis dataset and observed precipitation data for the referred period are used as meteorological forcing data. The most important parameters affecting the hydrological process are identified by means of a parametric sensitivity analysis. Specifically, these main parameters are the Manning's roughness coefficient of channel, the soil infiltration capacity and the hydraulic conductivity of riverbed. To calibrate the values of these parameters for the Yellow River Basin, model predictions for daily streamflow are compared with the corresponding observational data at four hydrological gauging stations including Tangnaihe (TNH), Lanzhou (LZ), Toudaoguai (TDG) and Huanyuankou (HYK) on the mainstream of the Yellow River. Quantitative agreement is found between these observations and the simulation results for all stations. The progress achieved in the present work paves the way for a sediment flux model over the Yellow River Basin and demonstrates the good performance of AHMS for long-term hydrological simulations. </p><p></p>

scholarly journals A Fractional Creep Constitutive Model for Frozen Soil in Consideration of the Strengthening and Weakening Effects

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Feng Hou ◽  
Quanming Li ◽  
Enlong Liu ◽  
Cheng Zhou ◽  
Mengke Liao ◽  
...  
Keyword(s):  
Shear Stress ◽  
Constitutive Model ◽  
Test Specimen ◽  
Confining Pressure ◽  
Frozen Soil ◽  
Strengthening Effect ◽  
Term Strength ◽  
Test Results ◽  
Creep Constitutive Model

The triaxial creep tests of frozen silty clay mixed with sands were performed under different pressures, and the test results demonstrated that, under the low confining pressure, when the shear stress is lower than the long-term strength, the test specimen exhibits an attenuation creep because the strengthening effect is greater than the weakening effect. When the shear stress is higher than the long-term strength, the test specimen exhibits a nonattenuation creep due to the level of the strengthening and weakening effects change in different stages. As the confining pressure increases, the test specimens only exhibit an attenuation creep because of the enhancing strengthening effect. Both the hardening parameter and the damage variable were introduced to describe the strengthening and weakening effects, respectively, and a new creep constitutive model for frozen soil considering these effects was put forward based on the theory of elastoviscoplastic and the fractional derivative. Finally, the model parameters were analyzed and their determination method was also provided to reveal the trend of parameters according to the triaxial test results. The calculated results of the constitutive model show that the proposed model can describe the whole creep process of frozen soil well.

Dynamics of Bottom Boundary Layers in the Yellow River Subaqueous Delta Based on Long-Term In-Situ Observations

2017 ◽  
Vol 91 (1) ◽  
pp. 369-370 ◽  
Author(s):  
Chaoqi ZHU ◽  
Yonggang JIA ◽  
Zhenhao WANG ◽  
Lei GUO ◽  
Hongxian SHAN ◽  
...  
Keyword(s):  
Boundary Layers ◽  
Yellow River ◽  
The Yellow River ◽  
Bottom Boundary ◽  
Bottom Boundary Layers ◽  
In Situ Observations

Sediment and State in Imperial China: The Yellow River Watershed as an Earth System and a World System

2016 ◽  
Vol 11 (2) ◽  
pp. 121-147 ◽  
Author(s):  
Ruth Mostern
Keyword(s):  
Landscape Change ◽  
Spatial Organization ◽  
Yellow River ◽  
The Yellow River ◽  
Earth System ◽  
The Loess Plateau ◽  
The World ◽  
Fragile Environment ◽  
Imperial China

China’s Yellow River is the most sediment laden water course in the world today, but that came to be the case only about a thousand years ago. It is largely the result of agriculture and deforestation on the fragile environment of the loess plateau in the middle reaches of the watershed. This article demonstrates that the long term environmental degradation of the Yellow River was primarily anthropogenic, and furthermore, it explains how the spatial organization of state power in imperial China amplified the likelihood and consequences of landscape change.

Sign in / Sign up

Export Citation Format

Share Document