Research on the Protective Effect of Twin-groyne Arrangement on Riverbank
DOI:
https://doi.org/10.14311/CEJ.2023.04.0034Keywords:
arrangement, erosion, hydraulics, scour, spur dike, twin-groyneAbstract
A curved channel with intersecting streams can be easily scoured by incoming flow, and the concave bank is badly damaged. This research showed that the twin-groyne could effectively adjust and optimize the flow velocity distribution, change the shape of the free water surface of the bend, prevent erosion, and promote silting on the concave bank, and it could provide a scouring and silting effect on the convex bank. When the spacing of twin-groyne was increased to more than four times the body length of the single-groyne (spur dike), the protective effect on the concave bank was weakened, and the scouring and silting effect of the convex bank was reduced. Excessive spacing of the twin-groyne could cause local erosion damage to the concave bank. When the distance exceeded the theoretical optimum, it was equivalent to the effect of single-groyne. With the increase in the submergence degree, the velocity of the concave bank decreased first and then increased, while the velocity of convex bank decreased continuously. The protective effect of a non-submerged twin-groyne with a dam spacing of four times the body length of the single-groyne was better than that of other conditions, and it is recommended to be used in practice.
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References
Tripathi, R. P. and Pandey, K. K., 2021. Experimental study of local scour around T-shaped spur dike in a meandering channel. Wat. Sci. Tech.: Wat. Sup, vol. 21(1/2): 542-552.
Ying, Q., Jiao, Z. B., 2004. Spur dike hydraulics. China Ocean Press, Beijing, China. (in Chinese)
Sumi, T., Takebayashi, H., Sakuma, M., Hasegawa, M., Ito, K., Yamamoto, S., and Shibata, G., 2021. Installation and adaptive management of T-shaped and L-shaped spur dikes to control bed deformation and diversify physical environment in rivers. Hydro-Environ, vol. 37: 13-31.
Zamani, M., Rabiefar, H., and Rostami, M., 2020. Experimental evaluation of spur dikes placement position effect on the hydraulic and erosion conditions of intakes. Wat. Sci. Tech.: Wat. Sup, vol. 20(3/4): 900-908.
Li, Z. Q., Li, H., Li, J., and Li, R., 2003. Experimental study and numerical simulation of flow in the vicinity of a submerged spur-dike. Hydraul. Eng, vol. 8:53-57. (in Chinese)
Pandey, M., Valyrakis, M., Qi, M. L., Sharma, A., and Lodhi, A. S., 2021. Experimental assessment and prediction of temporal scour depth around a spur dike. Int. J. Sediment. Res, vol. 36(1): 17-28.
Zhang, K., 2012. Study on flow characteristics of different structure types of spur dike. Master degree thesis, Chongqing Jiaotong University, Chongqing, China. (in Chinese)
Li, M. L., Wang, Y. P., Liu, H. H., and Yu, T., 2014. Experimental study on water surface line of twin-groyne in mountain rivers. China Wat. Trans, vol. 14(11): 215-219. (in Chinese)
Cao, X. M., and Gu, Z. H., 2015. Three classification criteria and their comparison impact scale between double non-submerged spur dikes. Zhejiang Univ.: Eng, vol. 49(2): 200-207. (in Chinese)
Liu, Y. Z., Jiang, C. B., Deng, B., and Wang, G., 2015. PIV experiment on flow characteristics between submerged double spur dikes. Adv. in Sci. and Tech. of Wat. Res, vol. 34(6): 26-30. (in Chinese)
Gu, J., and Zheng, Y. H., 2017. Influences of different hydraulic gradients on flow structures near submerged spur dike. Hydro-Sci. and Eng, vol. 2:75-81. (in Chinese)
Shampa, Hasegawa, Y., Nakagawa, H., Takebayashi, H., and Kawaike, K., 2020. Three-Dimensional Flow Characteristics in Slit-Type Permeable Spur Dike Fields: Efficacy in Riverbank Protection. wat, vol. 12(4): 964.
Sharma, K., and Mohapatra, P. K., 2013. Separation zone in flow past a spur dyke on rigid bed meandering channel. Hydraul. Eng, vol. 138(10): 897-901.
Kiani, A., Masjedi, A., Pourmohammadi, M. H, Heidarnejad, M., and Bordbar, A., 2017. Experiment of local scour around a series of spur dikes in river bend. Fresen. Environ. Bull, vol. 26(8): 5331-5339.
Duan, J. G., 2015. Mean Flow and Turbulence around a Laboratory Spur Dike. Hydraul. Eng, vol. 135(10): 803-811.
Chang, F. T., and Feng, W., 1992. Experiment at Investigation of Reasonable Spacing among Spur Dikes. Hohai Univ, vol. 20(4):7-14. (in Chinese)
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