浅水非线性波作用下沙纹床面底层流动特性试验研究

程永舟; 王永学; 蒋昌波; 陈纯

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浅水非线性波作用下沙纹床面底层流动特性试验研究

程永舟, 王永学, 蒋昌波, 陈纯

文章导航 > 水科学进展 > 2007 > 18(6): 801-806

程永舟, 王永学, 蒋昌波, 陈纯. 浅水非线性波作用下沙纹床面底层流动特性试验研究[J]. 水科学进展, 2007, 18(6): 801-806.

引用本文:

程永舟, 王永学, 蒋昌波, 陈纯. 浅水非线性波作用下沙纹床面底层流动特性试验研究[J]. 水科学进展, 2007, 18(6): 801-806.

CHENG Yong-zhou, WANG Yong-xue, JIANG Chang-bo, CHEN Chun. Experimental study on characteristics of flow field over asymmetric rippled bed under nonlinear shallow water wave[J]. Advances in Water Science, 2007, 18(6): 801-806.

Citation:

浅水非线性波作用下沙纹床面底层流动特性试验研究

1.
长沙理工大学河海工程学院, 湖南, 长沙, 410076;
2.
大连理工大学海岸和近海工程国家重点实验室, 辽宁, 大连, 116024

基金项目: 国家自然科学基金资助项目(1020200350479015);教育部新世纪优秀人才支持计划资助项目(NCET-05-0710)

详细信息

作者简介:
程永舟(1974- ),男,湖北广水人,博士研究生,主要从事港航、海岸及近海工程的研究.E-mail:chengyongzhou@163.com

中图分类号: TV139.2;TV131.2

Experimental study on characteristics of flow field over asymmetric rippled bed under nonlinear shallow water wave

1.
College of River and Ocean Engineering, Changsha University of Science and Technology, Changsha 410076, China;
2.
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

Funds: The study is financially supported by the National Natural Science Foundation of China(No.10202003;50479015).

摘要: 通过水槽试验研究浅水非线性波作用下沙纹床面底层流动特性,利用CCD图像技术观测分析非对称沙纹的形成和演化规律。利用声学多普勒测速仪(ADV)测量非对称沙纹底床上的流场,得到了不同波高、周期、水深条件下的沙纹峰顶和谷底断面的瞬时速度。试验结果分析表明,浅水非线性波作用下床面上形成非对称沙纹,其近底流速具有较强紊动特性,随着距床面距离的增大紊动强度逐渐减弱。在水流方向改变时,沙纹背部具有明显漩涡运动。沙纹背后形成的漩涡能起到维持沙纹的作用。浅水非线性波作用下,沙纹的形成原因主要是床面泥沙颗粒在非对称流动和床面近壁粘性底层中漩涡结构动力作用下,作受迫摆动、推移所致。
- 浅水非线性波 /
- 沙纹 /
- 漩涡 /
- 紊动特性 /
- 试验研究
Abstract: Vortex ripple is widely formed in the coastal region,and the dynamics of vortex is responsible for the sediment transport.The evolution of the initially flat sandy bed is studied in a laboratory wave tank under cnoidal wave conditions.The Acoustic Doppler Velocimeter(ADV)was used to acquire detailed velocity measurements at different positions.The nonlinear wave flow induces asymmetric rippled bed.CCD images were analyzed and the data on topography changes were obtained.The flow structure in the asymmetric rippled bed under the action of the cnoidal wave,and the complete process of the vortex formation,evolvement and disappearance were observed.The formation and the evolution of ripple were analyzed.A separation of the near-bed velocity field of the cnoidal waves over the asymmetric ripples indicates that the near-bed flow field is dominated by the turbulent motion,and the level of turbulence decreases with the increase of the distance away from the bed.The turbulence is anisotropic.The experiment result shows that the mechanism by which sand ripples maintain their shape is in the form of the dynamic equilibrium.Sediment may be lifted from the ripple face,picked up in suspension by the local velocity,and deposited over the crest and in the lee of the ripples.
- nonlinear shallow water wave /
- ripple /
- vortex /
- turbulent performance /
- experimental study

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浅水非线性波作用下沙纹床面底层流动特性试验研究

1. 长沙理工大学河海工程学院, 湖南, 长沙, 410076;

2. 大连理工大学海岸和近海工程国家重点实验室, 辽宁, 大连, 116024

基金项目: 国家自然科学基金资助项目(1020200350479015);教育部新世纪优秀人才支持计划资助项目(NCET-05-0710)

作者简介:
程永舟(1974- ),男,湖北广水人,博士研究生,主要从事港航、海岸及近海工程的研究.E-mail:chengyongzhou@163.com

收稿日期: 2006-08-30
修回日期: 2006-10-30
刊出日期: 2007-11-25

中图分类号: TV139.2;TV131.2

关键词:

浅水非线性波 /

沙纹 /

漩涡 /

紊动特性 /

试验研究

摘要: 通过水槽试验研究浅水非线性波作用下沙纹床面底层流动特性,利用CCD图像技术观测分析非对称沙纹的形成和演化规律。利用声学多普勒测速仪(ADV)测量非对称沙纹底床上的流场,得到了不同波高、周期、水深条件下的沙纹峰顶和谷底断面的瞬时速度。试验结果分析表明,浅水非线性波作用下床面上形成非对称沙纹,其近底流速具有较强紊动特性,随着距床面距离的增大紊动强度逐渐减弱。在水流方向改变时,沙纹背部具有明显漩涡运动。沙纹背后形成的漩涡能起到维持沙纹的作用。浅水非线性波作用下,沙纹的形成原因主要是床面泥沙颗粒在非对称流动和床面近壁粘性底层中漩涡结构动力作用下,作受迫摆动、推移所致。

English Abstract

Experimental study on characteristics of flow field over asymmetric rippled bed under nonlinear shallow water wave

1. College of River and Ocean Engineering, Changsha University of Science and Technology, Changsha 410076, China;

2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

Funds: The study is financially supported by the National Natural Science Foundation of China(No.10202003;50479015).

Received Date: 2006-08-30
Rev Recd Date: 2006-10-30
Publish Date: 2007-11-25

Keywords:

Abstract: Vortex ripple is widely formed in the coastal region,and the dynamics of vortex is responsible for the sediment transport.The evolution of the initially flat sandy bed is studied in a laboratory wave tank under cnoidal wave conditions.The Acoustic Doppler Velocimeter(ADV)was used to acquire detailed velocity measurements at different positions.The nonlinear wave flow induces asymmetric rippled bed.CCD images were analyzed and the data on topography changes were obtained.The flow structure in the asymmetric rippled bed under the action of the cnoidal wave,and the complete process of the vortex formation,evolvement and disappearance were observed.The formation and the evolution of ripple were analyzed.A separation of the near-bed velocity field of the cnoidal waves over the asymmetric ripples indicates that the near-bed flow field is dominated by the turbulent motion,and the level of turbulence decreases with the increase of the distance away from the bed.The turbulence is anisotropic.The experiment result shows that the mechanism by which sand ripples maintain their shape is in the form of the dynamic equilibrium.Sediment may be lifted from the ripple face,picked up in suspension by the local velocity,and deposited over the crest and in the lee of the ripples.

程永舟, 王永学, 蒋昌波, 陈纯. 浅水非线性波作用下沙纹床面底层流动特性试验研究[J]. 水科学进展, 2007, 18(6): 801-806.

引用本文:

程永舟, 王永学, 蒋昌波, 陈纯. 浅水非线性波作用下沙纹床面底层流动特性试验研究[J]. 水科学进展, 2007, 18(6): 801-806.

Citation: