中国农村水利水电Issue(4)：27-31,5.DOI:10.12396/znsd.2500897
柔性防护网孔径对下切河道防护效果的影响
Influence of Aperture Size of Flexible Protection Mesh on the Effectiveness of Undercut River Protection
摘要
Abstract
When the sediment inflow from the upstream of a river is less than the sediment carrying capacity of the flow,the scouring and erosion effect of the flow on the riverbed will be intensified,resulting in continuous incision.In addition to the traditional common method of river regime control structures,Laying flexible protection network on the riverbed can stabilize the erosion datum,thus effectively enhancing the riverbed impact resistance and inhibiting the riverbed undercutting.In this paper,through 16 groups of indoor flume test,the protection network aperture dn change on the riverbed protection section of the impact of water and sand movement is explored.The results show that:under the same water intensity,as the aperture increases,the protective effect of the flexible network also improves;for flexible network with the same aperture size,as the water intensity θ increases,the protective effect is weakened.Through the test phenomenon,it is found that a scour hole forms downstream of the flexible protection net,and the scouring depth intensifies within a certain distance upstream.Hydraulic calculations reveal that there is a certain head loss between the protection net and the section in front of the net;at the same time,the turbulent vortex caused by the punching pit downstream of the protection net propagates upstream,and the combined effect of these two factors leads to additional scouring effect in front of the net.The results of this research can provide a reference for aperture selection in the application of flexible protection net in actual projects,and provide a research basis for how to inhibit the destabilizing damage of protection net by violent downcutting upstream of the net.关键词
河床下切/柔性防护网/局部冲刷/水力参数/相对孔径Key words
riverbed undercutting/flexible protection network/localized scour/hydraulic parameters/relative aperture size分类
建筑与水利引用本文复制引用
甘晓燕,李馨楠,张婧,胥桓滔,秦瑞韩,白云,周家慧..柔性防护网孔径对下切河道防护效果的影响[J].中国农村水利水电,2026,(4):27-31,5.基金项目
四川省自然科学基金项目"下切型河道柔性防护网防治技术及作用机理研究"(2023NSFSC0950). （2023NSFSC0950）
