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工程科学与技术:2014,46(2):14-19
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河宽渐变水流运动对河床冲淤特性影响的数值分析
(1.浙江同济科技职业学院;2.浙江省水文局;3.四川大学 水力学与山区河流开发保护国家重点实验室)
Numerical Study on the Effects of Flow Motion on Channel Evolution in Gradual Width River
(1.Zhejiang Tongji Vocational College of Sci. and Technol.;2.Hydrological Bureau of Zhejiang Province;3.State Key Lab. of Hydraulics and Mountain River Eng.,Sichuan Univ.)
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投稿时间:2013-08-19    修订日期:2013-12-27
中文摘要: 天然河道受水沙条件、堤防工程等因素的影响,其平面形态常呈现河道展宽与缩窄的特征。以宽窄渐变河段的洪水过程与典型断面冲淤变化特性为基础,利用数值模型探讨了河宽渐变对水流运动特性的影响,并进一步分析了局部区域冲淤的水动力机理。分析结果表明:不同的洪水过程峰量大小及历时特征,将显著影响其涨退水强度;不对称的河道展宽与缩窄将改变断面流速峰值的分布;河床断面的冲淤特性取决于洪水过程的流速变化与床沙临界起动流速的大小。
Abstract:The wide gradual reach is a common form of natural rivers because of the impacts of flow and sediment conditions, and man-made projects.Based on the flood process and erosion and deposition of hydrological observational cross section in a gradual width river, the hydrodynamic characteristics was simulated and analyzed by means of a two-dimensional flow model. The comparison between observation and simulation showed that the intensities of increase and decrease of flood depend on the value and duration of flood process, and the velocity distribution at any cross section often change with the variation of asymmetry river wide, which affects the bed deformation in the whole reach considering the effect of sediment critical incipient velocity.
文章编号:201300902     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(41171016)
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高永胜,王淑英,周苏芬,王协康.河宽渐变水流运动对河床冲淤特性影响的数值分析[J].工程科学与技术,2014,46(2):14-19.
Gao Yongsheng,Wang Shuying,Zhou Sufen,Wang Xiekang.Numerical Study on the Effects of Flow Motion on Channel Evolution in Gradual Width River[J].Advanced Engineering Sciences,2014,46(2):14-19.