Drainage Engineering Research Articles

Analysis of Improvement and Innovation of Construction Technology of Building Water Supply and Drainage Engineering

Analysis of Improvement and Innovation of Construction Technology of Building Water Supply and Drainage Engineering

Research on Long-distance Pipe Jacking Construction Technology in Municipal Water Supply and Drainage Engineering

Research on Long-distance Pipe Jacking Construction Technology in Municipal Water Supply and Drainage Engineering

Numerical simulation of flow on circular crested stepped spillway

The spillways are one of the most important hydraulic structures used in river engineering, dam construction, irrigation, and drainage engineering projects. Recently, a new type of such spillways with a circular crest has been proposed. In this paper, the hydraulic properties of the circular crested stepped spillway (CCSS) including flow pattern, distribution of velocity on the crest and pressure, turbulence intensity, discharge coefficient ({C}_{d}) and energy dissipation ratio (EDR) were investigated numerically. To model the free surface of flow the volume of fluid technique, and for modeling the turbulence of flow, k − ε (RNG) was utilized. Results declared that there is a good agreement between the laboratory observations and numerical simulation. The {C}_{d} of the CCSS changes between 0.9 and 1.4 considering the range of relative upstream head ({h}_{up}/R) between 0.33 m and 2.67. The observation of the flow streamlines showed that they are tangential to the curvature of the crest and there is no separation of the flow from the crest. Examination of the pressure distribution on the CCSS model shows that just downstream part of the crest, the pressure is partially negative. Of course, the same partial negative pressure is observed on the edge of the steps. The steps increase the maximum intensity turbulence by 50%. The CCSS can dissipate the energy of flow between 90 and 30%, and in the skimming flow regime, the portion of each step in the energy dissipation regardless of their position is almost identical.

Measures of Using Long-distance Pipe Jacking Construction Technology in Municipal Water Supply and Drainage Engineering

Measures of Using Long-distance Pipe Jacking Construction Technology in Municipal Water Supply and Drainage Engineering

Application of Energy-saving Technology in Municipal Water Supply and Drainage Engineering Design

Application of Energy-saving Technology in Municipal Water Supply and Drainage Engineering Design

Cocompetitive Characteristics and Quantitative Design of Engineering Parameters for Coal Gas Predrainage Boreholes

Quantitative design of the optimal gas extraction engineering parameters has always been a key scientific problem to meet the predrainage target of the coal seam, which is paid great attention to and urgently expected to solve for the gas extraction engineering of coal mine. In this paper, the governing equation of the evolution of coal seam gas content is established under the interference and cooperation of gas extraction by boreholes, and the calculation formula of gas cooperative efficiency is defined. Based on gas-air mixed flow, a multifield coupling 3d model of coal gas extraction using boreholes was developed. The content, method, and principle of optimal spacing parameter design of extraction borehole were proposed, and the constraint conditions and objective function of optimal design were constructed. The flow characteristics of gas extraction using boreholes in the coal seam area and the influence of different parameters on gas extraction effect are studied. The cooperative and competitive behaviors of gas extraction by boreholes in coal seam are revealed. The results show that borehole spacing, seam fracture permeability, and gas adsorption constant have significant effects on the synergistic and competitive effects of gas extraction, while the negative pressure of gas extraction and coal matrix permeability have little effects, but the negative pressure of gas extraction has great effects on gas extraction concentration. Finally, Comsol With Matlab is used to solve the multiconstraint nonlinear optimization problem of gas drainage engineering parameters along coal seam in 18401 working face of Tunlan Coal Mine. The effect of actual gas extraction investigation is very remarkable, which provides a quantitative calculation basis for scientific gas extraction in coal mine.

Talking about Application of Energy-saving Technology in Municipal Water Supply and Drainage Engineering Design

Talking about Application of Energy-saving Technology in Municipal Water Supply and Drainage Engineering Design

Discussion on Anti-leakage Treatment and Preventive Measures in Water Supply and Drainage Engineering

Discussion on Anti-leakage Treatment and Preventive Measures in Water Supply and Drainage Engineering

Research on the Application of BIM Technology in Building Water Supply and Drainage Engineering

Research on the Application of BIM Technology in Building Water Supply and Drainage Engineering

Application of Project-driven Teaching Method in Irrigation and Drainage Engineering

Irrigation and Drainage Engineering is the core compulsory course of agricultural water conservancy engineering. It is professional and practical, cultivating students' ability of planning and design and practice. The traditional teaching method cannot integrate theory with practice well. Therefore, based on the current situation of agricultural water conservancy project teaching in Hebei Agricultural University, Application of project-driven teaching method for Irrigation and Drainage Engineering was discussed in paper, and the main teaching design process was put forward, which provides reference for further deepening the teaching reform of Irrigation and Drainage Engineering.

Technology and Development of Municipal Water Supply and Drainage Engineering Treatment

Technology and Development of Municipal Water Supply and Drainage Engineering Treatment

Stagewise water requirement of vegetable crops under protected and unprotected cultivation

The study was undertaken with the objective to estimate the crop water requirement of capsicum (Capsicum annuum L.), cucumber (Cucumis sativus L.) and tomato (Solanum lycopersicum L.) grown under naturally ventilated polyhouse and open environment during 2015–17 at Irrigation & Drainage Engineering, GBPUAT, Pantnagar. The water requirement was estimated using reference evapotranspiration and crop coefficient by incorporating the wetting percentage, crop coefficient and crop spacing. The water requirement was estimated for crops of two seasons grown under polyhouse and open environment and was found to be 203.77 mm and 101.68 mm for capsicum 1, 126.65 mm and 285.11 mm for capsicum 2, whereas 106.53 mm and 253.22 mm for cucumber 1, 130 mm and 605.8 mm for cucumber 2 respectively. During six months of growing period, the average water requirement for crops under polyhouse and open environment were found to be 30% higher than that of polyhouse.

Common Construction Quality Problems and Control Measures of Water Supply and Drainage Engineering

Common Construction Quality Problems and Control Measures of Water Supply and Drainage Engineering

Evaluating the stability of Outang landslide in the Three Gorges Reservoir area considering the mechanical behavior with large deformation of the slip zone

The large deformation mechanical properties of slip zone soil play an important role in the stability evolution of landslide. The traditional landslide stability evaluation method can only be used to calculate a single stability factor, which cannot dynamically evaluate the landslide stability as it evolves. The large deformation mechanical properties of slip zone soil from Outang landslide in the Three Gorges Reservoir area are investigated by the indoor repeated direct shear test. Based on the damage theory, the shear damage behavior of slip zone soil with large shear displacement is analyzed, and a mechanical model describing the relationship between shear stress and shear displacement in accordance with the mechanical mechanism of landslide is established. Then, the stability of Outang landslide is dynamically evaluated by skillfully combining the mechanical model and the residual thrust method. The results show that the slip zone soil has obvious softening behavior and constant residual strength under the condition of large deformation. The model with clear physical meaning can reflect the large displacement shear mechanical properties of slip zone soil, which is consistent with the test results. The stability factor of Outang landslide gradually decreases and tends to be constant as landslide moves. The mechanical mechanism of the landslide stability evolving with deformation is the strain softening behavior of the slip zone soil, and the mechanical mechanism of the landslide stability evolving with water level is the reduction of effective stress in anti-sliding section under the influence of reservoir water. It is suggested that active measures should be taken in time in the prevention and control of landslide, and the construction of drainage engineering should be paid attention to for large-scale bank landslides.

Analysis on Sewage Treatment Technology of Municipal Water Supply and Drainage Engineering

Analysis on Sewage Treatment Technology of Municipal Water Supply and Drainage Engineering

Investigation on Common Construction Quality Problems and Control Measures of Building Water Supply and Drainage Engineering

Investigation on Common Construction Quality Problems and Control Measures of Building Water Supply and Drainage Engineering

Discussion on Common Construction Quality Problems and Control Measures of Building Water Supply and Drainage Engineering

Discussion on Common Construction Quality Problems and Control Measures of Building Water Supply and Drainage Engineering

Analysis of flow loss characteristics of slanted axial-flow pump device based on entropy production theory.

Slanted axial-flow pump devices are widely applied in urban water supply, irrigation and drainage engineering fields. The second law of thermodynamics is applied to investigate the flow loss characteristics of the 30° slanted axial-flow pump model according to the flow loss analysis method of entropy production theory, so that the hydraulic loss characteristics can be revealed in internal flow process of the slanted axial-flow pump. The three-dimensional numerical simulation of the whole flow conduit in slanted axial-flow pump was conducted and the entropy production increased in the flow process was calculated. The location and distribution characteristics of the flow loss of the pump were qualitatively analysed. The results show that the entropy production in impeller is the highest among the pump components. With the increase of flow rate, the proportion of the entropy production in impeller in total value of the pump device increases continuously. The wall entropy production of impeller, guide vane and outlet conduit are lower than the mainstream entropy production, and the mainstream entropy production occupies the dominant position. As the flow rate grows, the proportion of turbulent dissipation entropy production decreases, and the proportion of wall dissipation entropy production increases. At 0.8Qbep, the proportion of turbulent dissipation entropy production is close to 74%, which is about 2.8 times that of wall entropy production. Under 1.2Qbep condition, the proportion of turbulent dissipation entropy production is just 5.5% higher than that of wall dissipation entropy production.

Analysis on the Municipal Water Supply and Drainage Engineering Problems and Quality Control Analysis

Analysis on the Municipal Water Supply and Drainage Engineering Problems and Quality Control Analysis

Analysis on Common Construction Quality Problems and Control Measures of Building Water Supply and Drainage Engineering

Analysis on Common Construction Quality Problems and Control Measures of Building Water Supply and Drainage Engineering