陡窄河谷挑流消能下游边坡防冲试验研究

周望武; 魏杰; 苗宝广; 戴晓兵; 任炜辰

doi:10.11988/ckyyb.20221196

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长江科学院院报 ›› 2024, Vol. 41 ›› Issue (2) : 76-81. DOI: 10.11988/ckyyb.20221196

水力学

陡窄河谷挑流消能下游边坡防冲试验研究

周望武^1,2, 魏杰^1,2, 苗宝广^1,2, 戴晓兵^1,2, 任炜辰³

作者信息 +

Experimental Study on Downstream Slope Erosion Prevention for Ski-jump Energy Dissipation in Steep Narrow Valley

ZHOU Wang-wu^1,2, WEI Jie^1,2, MIAO Bao-guang^1,2, DAI Xiao-bing^1,2, REN Wei-chen³

Author information +

文章历史 +

摘要

基于拉哇水电站溢洪洞采用挑流消能,对陡窄河谷下游边坡冲刷问题进行了试验研究。通过可视定床模型,对边坡水力学参数进行分析,并与边坡动床试验进行了对比。试验成果表明:扭曲挑坎的水流流态、岸边流速以及脉动压力等指标均优于斜切挑坎,岸边最大压力点高程与基岩抗冲流速等值线最低点高程相近;采用散粒体模拟陡峻边坡,边坡冲刷形态与定床岸边流速规律呈现较好的相关性,能较好地反映陡峻基岩边坡受水流冲刷作用的破坏范围。研究成果对类似工程的岸坡支护分区划分、防护深度确定和支护结构型式的设计具有一定的借鉴意义。

Abstract

An experimental study was conducted to investigate the scour prevention of downstream slopes in steep narrow valleys based on the ski-jump energy dissipation of the overflow tunnel at Lawa Hydropower station. The hydraulic characteristics of the slopes were analyzed using both fixed bed and moving bed tests. The experimental findings indicate that the water flow pattern, near-bank velocity, and fluctuating pressure of the skew bucket are superior to those of beveled flip bucket. Additionally, the elevation of the maximum impact pressure point on the riverbank is close to the lowest elevation of bedrock’s capacity to withstand scouring velocity. The scour pattern on steep slopes simulated with granular soils aligns well with the flow velocity law observed in fixed bed banks, thereby providing a more accurate representation of the damage caused by water scour on steep bedrock slopes. These research results hold significant reference value for determining bank slope support, protection depth, and support structure design in similar projects.

导出引用

周望武, 魏杰, 苗宝广, 戴晓兵, 任炜辰. 陡窄河谷挑流消能下游边坡防冲试验研究[J]. 长江科学院院报. 2024, 41(2): 76-81 https://doi.org/10.11988/ckyyb.20221196

ZHOU Wang-wu, WEI Jie, MIAO Bao-guang, DAI Xiao-bing, REN Wei-chen. Experimental Study on Downstream Slope Erosion Prevention for Ski-jump Energy Dissipation in Steep Narrow Valley[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(2): 76-81 https://doi.org/10.11988/ckyyb.20221196

中图分类号： TV135

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