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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. An analytical solution for long waves scattering around a circular island
	NIU Xiaojing
	Hydraulic Engineering 30 June 2014
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	Abstract:Based on the long wave equation, a new analytical solution is obtained for long waves propagating over a circular island mounted on a flat bottom. The profile of the island is idealized as a power function of the radial distance with arbitrary powers. The solution is found by using the separation of variables and the Frobenius method. A more straightforward way is applied to solve the ordinary differential equation derived from the long wave equation by separation of variables. The newly derived analytical solution is compared with the previous solution obtained by Jung et al.(2010). Excellent agreement is found between the two solutions for the same cases, while the present solution is superior to that of Jung et al.(2010) in the convergence of the series solution in most cases.
	TO cite this article:NIU Xiaojing. An analytical solution for long waves scattering around a circular island[OL].[30 June 2014] http://en.paper.edu.cn/en_releasepaper/content/4602969


	3. Analysis of Hydro-Mechanical Interaction to Pervious Pressure Tunnel
	SU Kai,Wu Hegao
	Hydraulic Engineering 10 February 2014
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	Abstract:Given internal water load as a kind of body load, an axisymmetric thick-walled cylinder model is built, in which the nonuniformity coefficients of reinforcement strain and concrete strain are introduced to compute the lining's equivalent permeability coefficient. The water-filled joint element model is developed to simulate the limited cooperation between reinforced concrete lining and surrounding rock. And an equivalent method is adopted to develop the computer program. The reinforcement stress and the surrounding rock stresses are calculated in pervious pressure tunnel with internal water exosmosis. The results show that the reinforcement stress obtained by the new method is near the observed data in the practice project. The fact that the reinforcement stress is at a lower stress level in the pervious pressure tunnel with high internal water load is verified.
	TO cite this article:SU Kai,Wu Hegao. Analysis of Hydro-Mechanical Interaction to Pervious Pressure Tunnel[OL].[10 February 2014] http://en.paper.edu.cn/en_releasepaper/content/4585034


	4. Relationships between Total Dissolved Gas and Dissolved Oxygen in Water
	MA Qian,LI Ran,FENG Jingjie,WANG Lele
	Hydraulic Engineering 25 June 2013
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	Abstract:Supersaturated dissolved gas can cause gas bubble disease in fish, potentially increasing their mortality. Previous studies have indicated that total dissolved gas (TDG) has a more serious impact on fish than other dissolved gases, such as dissolved oxygen (DO) or dissolved nitrogen. However, for many reasons, dissolved oxygen (DO) concentrations are generally used as a proxy for determining total dissolved gas (TDG) concentrations. Here, the relationships between TDG and DO concentrations are discussed relative to laboratory experiments and field TDG concentrations downstream of dam projects in China. The relationship between TDG and DO varied with time and space, and no clear or fixed relationship was observed between TDG and DO. Therefore, using DO concentrations to predict TDG supersaturation may result in large errors, and it is thus not appropriate to use DO concentrations as a predictor of TDG concentrations.
	TO cite this article:MA Qian,LI Ran,FENG Jingjie, et al. Relationships between Total Dissolved Gas and Dissolved Oxygen in Water[J].

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