Water Flow for Restricted Navigation in Shuifu Wharf on the Jinsha River

2011 ◽  
Vol 66-68 ◽  
pp. 2055-2061
Author(s):  
Zhong Chao Yang ◽  
Ming Dong Chen ◽  
Ming Chen
Keyword(s):  
Numerical Simulation ◽  
Water Flow ◽  
Yangtze River ◽  
Water Area ◽  
Jinsha River ◽  
Cross River ◽  
Port Operation ◽  
The North ◽  
Navigation Channel ◽  
Mountainous River

Located in the north of Yun’nan Province, Shuifu wharf on the Jinsha River is an important port on and a key waterway along Yangtze River. The navigation channel is typically mountainous river, with its water area narrow, its trough winding, its surroundings complicated and a variety of cross-river or on-river projects as obstructions. To ensure the safety of navigation and port operation, the two methods of numerical simulation and prototype ship test are adopted to determine the water flow for restricted navigation in Shuifu wharf, i.e., 8000m3/s.

Numerical simulation of three dimensional flow in Yazidang Reservoir based on image processing

2020 ◽  
Vol 39 (2) ◽  
pp. 1591-1600
Author(s):  
Lingxiao Huang ◽  
Qiao Qiao ◽  
Lanxiang Zheng ◽  
Libo Liu ◽  
Wenjuan Zhao ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Flow Field ◽  
Water Flow ◽  
Three Dimensional ◽  
Water Area ◽  
Image Edge Detection ◽  
Detection Technology ◽  
Processing Accuracy ◽  
Image Edge

In order to study the water flow movement of the Yazidang Reservoir, this paper generates the initial terrain for the researched water area with the image stitching technology and image edge detection technology, establishes a 3D k - ɛ mathematical model, solves the equations discretely by FVM and SIMPLEC algorithms, studies the numerical simulation of the water flow movement of the reservoir under four working conditions, and analyzes the flow field on the surface and at the bottom of the reservoir. The results show the improved terrain pre-processing accuracy and efficiency of the researched water area and the rationality of the water flow field and rate simulation results, which means that the established 3D turbulence mathematical model can be applied to the numerical simulation of the reservoirs similar to the Yazidang Reservoir. The numerical simulation of 3D turbulence in Yazidang Reservoir provides a theoretical basis and practical application value for the numerical simulation of similar reservoirs.

scholarly journals Optimal design of the solar tracking system of parabolic trough concentrating collectors

2020 ◽  
Vol 15 (4) ◽  
pp. 613-619
Author(s):  
Li Kong ◽  
Yunpeng Zhang ◽  
Zhijian Lin ◽  
Zhongzhu Qiu ◽  
Chunying Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Solar Radiation ◽  
Tracking System ◽  
Low Cost ◽  
Parabolic Trough ◽  
The North ◽  
Tracking Mode ◽  
Solar Tracking ◽  
East West

Abstract The present work aimed to select the optimum solar tracking mode for parabolic trough concentrating collectors using numerical simulation. The current work involved: (1) the calculation of daily solar radiation on the Earth’s surface, (2) the comparison of annual direct solar radiation received under different tracking modes and (3) the determination of optimum tilt angle for the north-south tilt tracking mode. It was found that the order of solar radiation received in Shanghai under the available tracking modes was: dual-axis tracking > north-south Earth’s axis tracking > north-south tilt tracking (β = 15°) > north-south tilt tracking (β = 45) > north-south horizontal tracking > east-west horizontal tracking. Single-axis solar tracking modes feature simple structures and low cost. This study also found that the solar radiation received under the north-south tilt tracking mode was higher than that of the north-south Earth’s axis tracking mode in 7 out of 12 months. Therefore, the north-south tilt tracking mode was studied separately to determine the corresponding optimum tilt angles in Haikou, Lhasa, Shanghai, Beijing and Hohhot, respectively, which were shown as follows: 18.81°, 27.29°, 28.67°, 36.21° and 37.97°.

scholarly journals Horizontal Movement of Fast Ice in the North Water Area

1977 ◽  
Vol 19 (81) ◽  
pp. 547-554 ◽  
Author(s):  
Hajime Ito ◽  
Fritz Müller
Keyword(s):  
Sea Ice ◽  
Water Area ◽  
Physical Characteristics ◽  
Stress Strain ◽  
Horizontal Movement ◽  
The North ◽  
North Water ◽  
Fast Ice ◽  
External Forces

AbstractThe understanding of the horizontal movement of fast ice is important for applied sea-ice mechanics. A case study, carried out in conjunction with a polynya known as North Water, is presented in this paper. The displacements of the fast-ire arches which separate the polynya from the surrounding ice-covered sea, were measured and found to be small. It is, therefore, confirmed that these arches prevent the influx of large quantities of sea ice into the polynya. The results are then explained in terms of the external forces (wind and current), the stress- strain situations and some physical characteristics (temperature and thickness) which were measured simultaneously.

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