Scientific Research and Reviews


Determining the location of River Dam Group based on set cover Model: A case study of Zambezi River Basin

Research Article of Scientific Research and Reviews Determining the location of River Dam Group based on set cover Model: A case study of Zambezi River Basin Tianlong Wang1*, Xiaorui Tao2, Dongkun Wu1, Haotian Feng2 1College of Civil Engineering & Architecture, China Three Gorges University, Yichang, 443002, China. 2College of Economics & Management, China Three Gorges University, Yichang, 443002, China Taking the Zambezi River Basin as a typical case, this paper studied the location problem of dam group. Based on the topographical and elevation maps of the Zambezi River Basin, we evaluated each region by five indicators (Water head difference elevation, Geological environment, Climatic environment, Population distribution and Biodiversity), and selected the 22 candidate dam sites. Meanwhile, the relative feasibility index of dam construction is calculated by the entropy weight-grey correlation analysis. On this basis, combined with the water management capacity of the dam, a set coverage model of dam selection is established, and the neighborhood adaptive particle swarm optimization algorithm (NAPSO) is used to solve the 12 most suitable dam sites. Comparing with the water management capacity of the original Kariba Dam, the new dams’ water storage and flood control capacity, hydroelectric power generation capacity, domestic water supply capacity and other water supply capacity have been increased by 235.92%, 250.62%, 189.66% and 223.61% respectively. Our study can provide some guidance for the site selection project of river dam group. Keywords: Dam site selection; Set coverage model; NAPSO; Entropy weight-grey correlation analysis ...

Improved soil plug height calculation formula

Research Article of Scientific Research and Reviews Improved soil plug height calculation formula Sashuang Gao Shanghai Maritime University, Shanghai 201306, China. This paper analyzes the soil plugging effect of the open pipe pile during the pile sinking process. The soil in the pipe pile is regarded as a continuous and uninterrupted multiple units, and the force analysis is carried out in the vertical direction, and the vertical balance equation of the soil in the pile is obtained. By establishing an equation, the expression of the plug height of the pipe pile during the pile sinking process is obtained. Comparing the theoretical calculation results with the actual project, it is concluded that the theoretical calculation results can reflect the overall change in the height of the soil plug. Therefore, the pile plug height obtained by calculation has certain guiding significance for the project. Keywords: Open pipe pile; Soil plug height; Theoretical calculation; Balance equation ...

The Role Of Acacia Decurrens Tree On Farmers Livelihod In The Banja Woreda

Research Article of Scientific Research and Reviews The Role Of Acacia Decurrens Tree On Farmers Livelihood In The Banja Woreda Bogale Aligaiz Agalu Department of History, Injibara The aim of the study assesses the role of Acacia Decurrens tree on Farmers Livelihood in the Banja Woreda. To this purpose, the study adopted descriptive survey design. The study focused on the three kebeles such as Zek na Gumerta, Bidana Jegola and kesa Chewsa in the Banaja district of the Awi Zone, Amhara regional state. This design would employ multiple sources of data such as distribution of questionnaires and conducting interviews with the concerned parties. The target population for this study was 25 rural kebeles, from those kebeles I selected three kebeles according to the homogeneity characteristics in plantation of Acacia decurrens tree. To determine the required sample size, the selected kebeles has 678 households’ farmers, 105 sample farmers are represented. Then, 35 sample farmers from each kebeles are selected by random sampling method. One-sample t-test analysis was made using Statistical Package for Social Sciences (SPSS) software version 20 to show the result of study. The result discussed by the use of the descriptive and econometric analysis. Keywords: Acacia Decurrens, Farmers Livelihood, Households ...

Numerical Simulation of Hole Distribution Blasting with Different Distribution Forms

Research Article of Scientific Research and Reviews Numerical Simulation of Hole Distribution Blasting with Different Distribution Forms Zhang Xiaoxiao Guizhou University, Mining Institute, Guiyang, Guizhou 550025 According to the vibration of cut blasting, the number of holes and the location of holes are reasonably designed by using finite element software LS-DYNA. The rectangular holes and hollow holes in straight cut are simulated respectively. Of the hole in the straight-cut undercut blasting vibration law. The analysis shows that the larger the diameter of the hole is, the better the vibration reduction is. The more the number of holes is, the more obvious the damping effect is. The best blasting effect of the large diameter hollow hole and the large diameter rectangular hole is 0.93cm/s Reduce the blasting vibration speed, buffered the blasting time; get both a good blasting effect and effective rapid damping effect. Keywords: Undercutting; Blasting; Void; Vibration law; Vibration reduction ...

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Scientific Research and Reviews

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