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1. Numerical study of effects of flushing gate height and sediment bed properties on cleaning efficiency in a simplified self-cleaning device | |||
Haofei Feng,Shengtao Du,David Zhu | |||
Hydraulic Engineering 22 March 2023 | |||
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Abstract:Sediment accumulation in combined sewers can induce blockage and odor problems. Among various cleaning methods, using self-cleaning device generated flushing waves has been thought to be an effective solution. In this study, a series of numerical tests were conducted using a CFD software to investigate the cleaning efficiency of deposited sediment particles based on a simplified self-cleaning device. The CFD model was validated by the experimental and numerical results in the literature. Effects of several parameters including the flushing gate height, sediment bed thickness, sediment bed length and sediment bed position on cleaning efficiency were discussed. A relative accumulative transport rate was defined to analyze the cleaning efficiency. Results showed that the lowest height of flushing gate had the best effects on sediment removal. The flushing waves generated from sudden opening of the flushing gate were capable of cleaning sediment deposit in the given initial sediment bed thickness, length and position. The required time duration for cleaning the sediment deposition completely increased about 6, 3 and 3 times when the sediment bed thickness, sediment bed lenth, and distance between the flushing gate and sediment bed increased 10, 4 and 7 times, respectively. | |||
TO cite this article:Haofei Feng,Shengtao Du,David Zhu. Numerical study of effects of flushing gate height and sediment bed properties on cleaning efficiency in a simplified self-cleaning device[OL].[22 March 2023] http://en.paper.edu.cn/en_releasepaper/content/4759922 |
2. Hydraulic properties in the flow with floating plants | |||
Han Jie,Huai Wenxin,Zhao Mingdeng | |||
Hydraulic Engineering 21 January 2011 | |||
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Abstract:This paper focuses on the hydraulic properties of a turbulent flow with floating plants in straight ditches. Light plastic clusters were used to simulate the floating plants in laboratory and Micro ADV with the maximum frequency of 50 Hz was adopted to measure the turbulent flow. Experimental results of stream-wise velocity shows that the flow can be divided into a roots layer with uniform velocity and a water layer, which can be further divided into an upper and a lower sub-layer. As the theoretical analysis, the poroelastic theory is applied by regarding plant roots as an immovable skeleton. The control equations are simplified and solved to give the vertical distribution of velocity and shear stress, which agree well with the experimental data. The results indicate that the velocity distribution fits to the logarithm law in both upper and lower water layers. Otherwise, as the roughness of the roots is greater than the bed, the boundary of the two sub-layers is closer to the bed. | |||
TO cite this article:Han Jie,Huai Wenxin,Zhao Mingdeng. Hydraulic properties in the flow with floating plants[OL].[21 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4408166 |
3. LES OF VERTICAL BUOYANT JETS IN JONSWAP WAVES | |||
Lu Jun,Wang Lingling,Zhu Hai | |||
Hydraulic Engineering 29 December 2010 | |||
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Abstract:A buoyant jet in irregular waves has been investigated by using large eddy simulation technique. The three dimensional filtered N-S and energy equation are numerically solved by fractional-step method in sigma-coordinate. The subgrid turbulent stress is modeled by a dynamic coherent eddy model proposed by the authors and the subgrid heat flux is also given by a dynamic eddy diffusivity model. The objective of this study is to investigate the characteristics of the buoyant jet with heat transfer in JONSWAP waves. The instantaneous process of diffusion of jet with heat transfer in random wave is given. The process of the jet-wave interaction is analyzed. The numerical result is of great theoretical importance for the understanding of jet behaviors in random waves. | |||
TO cite this article:Lu Jun,Wang Lingling,Zhu Hai. LES OF VERTICAL BUOYANT JETS IN JONSWAP WAVES[OL].[29 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4402348 |
4. Application of GAs and GIS in Xin’anjiang Model | |||
Song Xiaomeng,Kong Fanzhe | |||
Hydraulic Engineering 16 October 2009 | |||
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Abstract:Generally, in Xin’anjiang model, the basin is divided into a set of sub-basins by Thiessen method so that the spatial distribution of rainfall can be taken account, which the same recession constants of runoff concentration are used in all sub-basins. It can be seen that topography is not taken account. However, it is well known that the runoff concentration behaviors of basin largely depended on topographic characteristic. And also it adopts a traditional method to make parameters calibration and optimization which takes on uncertain factor. The paper make use of GIS to carve up sub-basins and genetic algorithm to make parameters calibration and optimization, and the application results in Dapoling River Basin show that the number of flood with the qualified rate of error of peak-time increased to 100% from 90%, and excellent rate increased to 30% from 20%, and that with relative error of peak of less than 5% increased to 50% from 30%. | |||
TO cite this article:Song Xiaomeng,Kong Fanzhe. Application of GAs and GIS in Xin’anjiang Model[OL].[16 October 2009] http://en.paper.edu.cn/en_releasepaper/content/35876 |
5. Applicability Analysis of Calculation Methods for ET0 with Limited Weather Data in Wuhan | |||
HE Jun,CUI Yuanlai,LI Yuanxiang | |||
Hydraulic Engineering 08 January 2009 | |||
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Abstract:The reference crop evapotranspiration of each typical hydrological years in Wuhan is calculated respectively by Priestley-Taylor formula, Hargreaves formula and Penman-Monteith formula. Based on the results of Penman-Monteith formula, the outcomes of Priestley-Taylor formula and Hargreaves formula are analyzed. It shows that there is no significant difference between the results of Hargreaves formula and Penman-Monteith formula. When the weather data required by Penman-Monteith formula was unavailable in this district, Hargreaves formula can be used to calculate ET0 instead of Penman-Monteith formula. There are many differences between the results of Priestley-Taylor formula and Penman-Monteith formula, Priestley-Taylor formula needs modified when used to calculate ET0 instead of Penman-Monteith formula in this district. | |||
TO cite this article:HE Jun,CUI Yuanlai,LI Yuanxiang. Applicability Analysis of Calculation Methods for ET0 with Limited Weather Data in Wuhan[OL].[ 8 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27471 |
6. 2D Hydrodynamic Modelling for Erhai Lake Applying TELEMAC Modelling System | |||
ZHANG Cheng,Claude GUILBAUD,TONG Chaofeng | |||
Hydraulic Engineering 10 June 2008 | |||
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Abstract:Numerical modelling is being used extensively to assist decision making in hydraulic and environmental field. TELEMAC System is a numerical modelling system for free surface hydrodynamics, water quality and sedimentology etc, popular in Europe but not introduced in China. The construction of 2D hydrodynamic model for Erhai Lake applies TELEMAC System for an interesting and important study. From the modeled results, lake hydrodynamics are well reproduced, the tracer’s behavior can also be seen. For the modelling itself, TELEMAC shows a good convenience and capability of reproducing reality. | |||
TO cite this article:ZHANG Cheng,Claude GUILBAUD,TONG Chaofeng. 2D Hydrodynamic Modelling for Erhai Lake Applying TELEMAC Modelling System[OL].[10 June 2008] http://en.paper.edu.cn/en_releasepaper/content/22082 |
7. Investigations of Turbulent Wakes Past a Circular Cylinder | |||
Jiang Chunbo,Yang Chen | |||
Hydraulic Engineering 20 May 2008 | |||
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Abstract:Turbulent wakes past a circular cylinder are investigated by using both the numerical model and the digital Particle Image Velocimetry (PIV) technique. The fractional step finite element scheme is extended to simulate the turbulent wakes, it has good accuracy and stability properties, and is suitable for convection dominated flows in the wake region. The emphasize is put on simulating the unsteady vortex shedding processes and the saddle position, which are important for understanding the mechanism of the turbulent wakes. The time mean velocity properties are obtained, which show the recirculation region and the similarity characteristics are exist in the near region of the turbulent wakes. The numerical results are compared with the PIV measurements. | |||
TO cite this article:Jiang Chunbo,Yang Chen. Investigations of Turbulent Wakes Past a Circular Cylinder [OL].[20 May 2008] http://en.paper.edu.cn/en_releasepaper/content/21580 |
8. The Calculation of Optimal Hydraulic Cross Section in cubic Parabola-Shape Canal | |||
Yang Guoli,Wei Wenli,Yang Jie | |||
Hydraulic Engineering 21 December 2006 | |||
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Abstract:The formula of discharge varying with normal water depth in cubic parabola shape open channel uniform flow and the conditions satisfied by the optimal hydraulic cross section in the cubic parabola shape channel were deduced, according to the theory of open channel uniform flow. Compared with other types of open channel cross section, the cubic parabola shape open channel is one of the open channels which convey water more efficiently. | |||
TO cite this article:Yang Guoli,Wei Wenli,Yang Jie. The Calculation of Optimal Hydraulic Cross Section in cubic Parabola-Shape Canal[OL].[21 December 2006] http://en.paper.edu.cn/en_releasepaper/content/10424 |
9. Hydraulic conductivity determination and leakage loss estimation, a case study of Beitang reservoir | |||
Li Wei | |||
Hydraulic Engineering 04 December 2006 | |||
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Abstract:The magnitude of leakage loss of Beitang reservoir, Tianjin City, was determined; this was one of the objectives of the study. The Alyamani & Sen Equation, which is an empirical equation based on representative grain-size distribution parameters, was used in hydraulic conductivity, K, determination and Kriging method was applied to estimating the spatial variation of permeability of the reservoir bed. The results show that the average K values of the reservoir bottom sediment is 3.96×10-5 cm s-1, the leakage loss estimated by Darcy equation is 1375.87 m3 d-1, and the north central part of the reservoir displays higher risk of leakage loss. The results indicate that the method of determining K by using grain–size distribution analysis and Alyamani & Sen Equation is suitable for the area with the similar condition, and could provide some useful suggestions for the future work; especially when the traditional method were couldn’t used. | |||
TO cite this article:Li Wei. Hydraulic conductivity determination and leakage loss estimation, a case study of Beitang reservoir[OL].[ 4 December 2006] http://en.paper.edu.cn/en_releasepaper/content/10138 |
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