Protective Effects of Different Shapes of Ecological Rip-rap Bags Based on CFD-DPM Model

SUN Hong-guang; HONG Liang-zhen; WANG Mao-mei; WANG Lian

doi:10.11988/ckyyb.20240532

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Journal of Changjiang River Scientific Research Institute ›› 2025, Vol. 42 ›› Issue (4) : 19-26. DOI: 10.11988/ckyyb.20240532

River-Lake Protection and Regulation

Protective Effects of Different Shapes of Ecological Rip-rap Bags Based on CFD-DPM Model

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Abstract

Curved slopes in natural river channels are highly susceptible to erosion, posing a significant challenge for river management. To address this issue, a comparative study was conducted on the protective effects of sand-and-gravel rip-rap bags of different shapes against erosion based on the concept of ecological slope protection. First, a geometric model of the curved-channel bed was constructed according to the actual river structure. Then, the CFD-DPM method was employed to analyze the bank-protection effects of rectangular, hemispherical, and semi-cylindrical bags placed on the concave bank of the curved channel. Results revealed that under a flow velocity of 0.5 m/s, among the three shapes of protection bags, rectangular bags bring about the least pressure on the concave bank, while semi-cylindrical bags obstruct the largest amount of sediment particles, leading to the smallest Reynolds number of particles and the minimum average particle velocity, 9% lower than that in the model without protection bags. In conclusion, rectangular rip-raping bags offers better protection for the adjacent concave bank, while semi-cylindrical bags provide the most effective sand-blocking function.

Key words

river bend slope protection / ecological protection / sand and gravel rip-rap bag / geometric modeling of curved riverbed / CFD-DPM method / protection effect

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SUN Hong-guang , HONG Liang-zhen , WANG Mao-mei , et al. Protective Effects of Different Shapes of Ecological Rip-rap Bags Based on CFD-DPM Model[J]. Journal of Changjiang River Scientific Research Institute. 2025, 42(4): 19-26 https://doi.org/10.11988/ckyyb.20240532

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