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岸边并联泄洪洞下游河道冲坑预测

徐建荣 辜晋德 颜志庆 何明杰 薛阳

徐建荣,辜晋德,颜志庆,等. 岸边并联泄洪洞下游河道冲坑预测[J]. 水利水运工程学报. doi:  10.12170/20211031001
引用本文: 徐建荣,辜晋德,颜志庆,等. 岸边并联泄洪洞下游河道冲坑预测[J]. 水利水运工程学报. doi:  10.12170/20211031001
(XU Jianrong, GU Jinde, YAN Zhiqing, et al. Prediction of river scour in downstream of bankside parallel spillway tunnel[J]. Hydro-Science and Engineering(in Chinese)) doi:  10.12170/20211031001
Citation: (XU Jianrong, GU Jinde, YAN Zhiqing, et al. Prediction of river scour in downstream of bankside parallel spillway tunnel[J]. Hydro-Science and Engineering(in Chinese)) doi:  10.12170/20211031001

岸边并联泄洪洞下游河道冲坑预测

doi: 10.12170/20211031001
基金项目: 国家重点研发计划资助项目(2016YFC0401705);国家自然科学基金资助项目(51409164)
详细信息
    作者简介:

    徐建荣(1964—),男,江苏苏州人,正高级工程师,主要从事水工水力学方面研究。E-mail:xu_jr@ecidi.com

    通讯作者:

    辜晋德(E-mail:jdgu@nhri.cn

  • 中图分类号: TV741

Prediction of river scour in downstream of bankside parallel spillway tunnel

  • 摘要: 挑流水舌对下游河道的冲刷关系到工程安全。根据动量方程推导了射流在下游水垫中的扩散规律,分析了下游水垫流速对射流扩散的影响,提出了动水垫下射流的临底流速计算方法。研究结果表明:动水流速增加了射流在水中的扩散距离,促进了射流扩散及射流流速衰减,降低了射流临底流速。将研究结果应用于白鹤滩岸边泄洪洞下游河道的冲坑深度预测。模型试验结果表明:在鼻坎水流参数相同的情况下,河道为动水时的冲坑深度较静水时冲坑深度减小约10%,且位于河道下游侧的挑流水舌形成的冲坑深度小于上游侧挑流水舌形成的冲坑。与常规预测公式相比,该方法能准确预测不同位置挑流水舌的冲坑深度,研究结果可为泄洪设施下游河道消能防冲设计提供依据。
  • 图  1  垂直射流在水中扩散示意

    Figure  1.  Diagram of vertical jet diffusion in water

    图  2  本文计算结果与文献试验结果对比

    Figure  2.  Calculation results comparison

    图  3  动水作用下射流扩散示意图

    Figure  3.  Jet diffusion under moving water cushion

    图  4  动水作用下的流速衰减

    Figure  4.  Velocity attenuation under moving water cushion

    图  5  白鹤滩泄洪洞平面布置

    Figure  5.  Plan view of Baihetan spillway tunnel

    图  6  泄洪洞下游冲坑

    Figure  6.  Scouring downstream the spillway tunnel

    表  1  试验工况

    Table  1.   Model test conditions

    工况编号工况描述上游水位/m下游水位/m上游来流量/泄洪洞流量/鼻坎单宽流量q/(m2·s−1
    (m3·s−1(m3·s−1
    11#+3#泄洪洞785597.301 37066.8
    28 765
    下载: 导出CSV

    表  2  计算结果与试验结果对比

    Table  2.   Calculated results compared with the experimental results

    工况编号上游来流量/泄洪洞流量/陈氏公式计算冲坑深度/m3#泄洪洞冲坑深度/m1#泄洪洞冲坑深度/m
    (m3·s−1(m3·s−1计算值试验值计算值试验值
    1 0 1 370 34.4 35.8 36.8 33.6 31.2
    2 8765 1 370 34.4 29.6 29.9 27.9 26.8
    下载: 导出CSV

    表  3  泄洪洞下游冲刷试验结果

    Table  3.   Model test results of scouring downstream the spillway tunnel

    上游
    水位/m
    下游
    水位/m
    3#泄洪洞落水点
    河道流速/(m·s−1
    3#泄洪洞冲坑深度2#泄洪洞落水点
    河道流速/(m·s−1
    2#泄洪洞冲坑深度 冲坑深度差值
    计算值
    /m
    试验值/
    m
    相对
    误差%
    计算值/
    m
    试验值/
    m
    相对
    误差%
    计算值/
    m
    试验值/
    m
    795 599.9 2.7 31.9 33.3 −4% 3.2 29.6 31.6 −6% 2.3 1.7
    795 604.0 2.2 45.4 45.1 1% 2.6 43.6 42.2 3% 1.8 2.9
    800 600.6 2.7 33.7 38.5 −12% 3.3 32.0 34.2 −6% 1.7 4.3
    800 605.4 2.1 48.9 49.2 −1% 2.7 46.0 44.2 4% 2.9 5.0
    810 601.8 2.5 43.9 44.5 −1% 3.1 40.8 39.8 3% 3.1 4.7
    810 607.2 1.9 52.0 51.0 2% 2.6 50.0 48.1 4% 2.0 2.9
    825 602.9 2.3 44.9 46.7 −4% 3.1 40.6 44.3 −8% 4.3 2.4
    下载: 导出CSV
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