三峡库区河道滑坡涌浪消减简单结构物型式优化研究
STUDY ON THE OPTIMIZATION OF THE SIMPLE STRUCTURE TYPE FOR RIVER LANDSLIDE SURGE REDUCTION IN THREE GORGES RES-ERVOIR AREA
许凯凯 1张全 2黄波林 1李宏林 1冯万里 1闫国强2
作者信息
- 1. 防灾减灾湖北省重点实验室,三峡大学,宜昌 443002,中国
- 2. 中国地质大学(武汉)工程学院,武汉 430074,中国
- 折叠
摘要
三峡库区水位变化加剧了河道内滑坡涌浪产生的频次.为了保证人民生命财产安全,对滑坡涌浪产生的能量进行了消减分析.通过物理模型试验对板式(T字型、十字型)、栅栏式(单列型、多列型)以及多孔式(整体型、分割型)消浪结构物进行消浪效率、消浪机制以及综合性应用对比分析,得到主要结论如下:栅栏式单列型在河道应急、涌浪消减方面效果最优,按照衰减性能与能量耗散共分为4种模式(入射波浪反射、竖向挡浪板对水体运动的阻挡、浮板与水体相互摩擦和回流).在对比试验基础上对栅栏式消浪结构物单列型进行试验参数优化、分析推导出栅栏式消能结构物最优型设计公式,并得出了在L/hw为0.65～0.75范围内时栅栏式消浪效率(β≥15％)和适用性最优.同时,在计算二维条件下最优消能效率值方法的基础上,进行三维条件消能结构物最优值的求解方法讨论并给出消能结构物在实际应用中的防治措施与建议.
Abstract
Changes in the water level in the Three Gorges Reservoir area have increased the frequency of landslide surges in the river,posing a threat to the safety of people's lives and property.To address this issue,reduction anal-ysis of the energy generated by the landslide surge physical model tests was conducted.The analysis focused on wave dissipation efficiency,wave dissipation mechanisms,and the comprehensiveness of plate types(T-shaped,cross type),fence types(single-row type,multi-row type),and multi-hole types(integral type,split type)of wave structures.Key conclusions drawn from comparative analysis include:The fence type single-row structure is most ef-fective in river emergency situations and wave reduction.Wave dissipation mechanisms involve incident wave reflec-tion,vertical wave breaker blocking water body movement,floating board and water body friction,and backflow.Through comparative tests,the parameters of the single-row fence type wave-absorbing structure were optimized.The optimal design formula for the fence-type energy-dissipating structure was deduced,indicating that the efficien-cy of wave dissipation(β≥15％)and applicability is best when the L/hw ratio falls within the range of 0.65 to 0.75.The method of calculating the optimal energy dissipation efficiency value under two-dimensional conditions was applied to discuss the solution method for the optimal value of the three-dimensional energy dissipation struc-ture.The study also provides prevention and control measures along with suggestions for the practical application of energy dissipation structures.
关键词
三峡库区/滑坡涌浪/消浪结构物/涌浪消减/消浪效率Key words
Three Gorges Reservoir area/Landslide surge/Wave structure/Surge mitigation/Wave dissipation efficiency引用本文复制引用
基金项目
国家重点研发计划项目(2018YFC1504806)
国家重点研发计划项目(2018YFC1504803)
出版年
2024
国家科技期刊平台
NSTL
万方数据