Turbulent Kinetic Energy Distribution around Experimental Permeable Spur Dike

Abstract

The spur dike is widely used in the waterway renovation project in the upper reaches of the Yangtze River as a remediation structure, but its water destruction is very common, and the influence of the permeable characteristics of the riprap spur dike on its stability has been neglected in many studies. Through the method of combining a generalized flume test and theoretical analysis, the influence of the submerged degree of the permeable spur dike, the porosity of the spur dike body, and the size of the void on its nearby turbulent kinetic energy is studied. The results show that the turbulent kinetic energy in the front of the spur dike increases with the increase of the submerged degree, decreases with the increase of the porosity, and first increases and then decreases with the increase of the pore size. At the axis of the dike, the turbulent kinetic energy increases with the increase of the submerged degree, decreases first and then increases with the increase of the porosity, and increases with the increase of the pore size. In the rear area of the dike, the turbulent kinetic energy decreases with the increase of the submerged degree, firstly decreases and then increases with the increase of the porosity, and first increases and then decreases with the increase of the pore size. The research results are of great significance to further understanding the water dike age of a permeable spur dike, and can provide scientific guidance for the design and restoration of spur dikes.

Development of Reinforced Concrete Piles in the Lower Yellow River, China

“…Inevitably, it is the presence of pores in permeable sheet piles that are highly likely to result in stress concentrations that will lead to cracks at the location of pores [17], weakening the safety performance of the pile. In addition, the turbulent kinetic energy in front of the sheet pile first increases and then decreases with increasing pore size; hence, an inappropriate pore size could increase the scouring intensity at the head of the pile [18]. Not only increasing turbulent kinetic energy but also the high-velocity flow passing through the pores of the commonly used permeable sheet pile (0 • ) without changing direction may cause riverbank scouring, destruction of aquatic habitats, and high flow thrust on the downstream piles, which ultimately may cause the failure of the spur dike [19].…”

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