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阶梯-深潭流场结构特征研究

DOI: 10.3969/j.issn.1674-0696.2014.05.17, PP. 77-80

Keywords: 工程地质学,阶梯-深潭,数值模拟,流场结构,能量耗散,河床稳定,geologyengineering,step-pool,numericalsimulation,structureofflowfield,energydissipation,riverbedstability

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Abstract:

:？以山区河流天然的阶梯-深潭结构为研究对象，采用k-ε双方程紊流数值模拟方法，研究了不同流量下的阶梯-深潭结构深潭底部流场结构与消能相关的性质。实验表明：阶梯-深潭结构的环流区发展可增加水流在深潭区的滞留时间，促进剩余能量的耗散，对河床的安全和稳定极为有利。在深潭区，主流转换为涡漩流的过程中紊动特别强烈，能量耗散高效且均匀，阻止了因能量的积聚而造成的河床直接被冲毁情形的发生。此外，阶梯-深潭结构通过感知不同的流量情形和结构的自稳状态，优化结构使水流形成平稳的流场且压力分布趋于均匀，促进了结构的稳定和安全。

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