群体浮帘促淤装置的水力特性研究

发布时间：2018-11-09 07:40

【摘要】：促淤技术的研究对于围海造地、滩涂开发以及保护湿地等都具有重要的理论与实际意义。因此，对于更为高效廉价的促淤技术的研究，成为越来越多国内外学者研究的课题。本文在现有的对于单个柔性促淤浮帘水动力特性及促淤积机理研究的基础上，针对促淤浮帘群，通过室内水槽实验，对促淤浮帘群内外层浮帘系缆力及其促淤积效果开展研究。主要工作内容和研究成果如下：（1）通过定床实验，观测了均匀恒定流和垂直作用下浮帘群的浮帘系缆力变化规律。研究表明，浮帘群内最大系缆力与静水浮力比值受到浮帘覆盖率、来流弗汝德数以及浮帘相对高度的影响，促淤浮帘群内相同位置的浮帘系缆力随着来流弗汝德数的增加呈现先增大后减小的变化趋势；随着浮帘覆盖率的增大，呈现先增大后减小再增大的变化趋势；随着浮帘相对高度增大，呈现逐步增大的趋势。（2）利用实测资料，通过量纲及回归分析得到了计算浮帘群内最大系缆力的经验公式。（3）通过动床实验，对于促淤浮帘群的促淤效果进行了初步分析研究，，得到促淤浮帘群的促淤效果主要受浮帘覆盖率、来流弗汝德数以及浮帘相对高度的影响，促淤浮帘群具有良好的促淤效果。（4）利用实测资料，通过量纲及回归分析得到了计算浮帘群内促淤积厚度的经验公式。本文的研究结果表明：促淤浮帘群安装简便，稳定性好，促淤效果明显，具有很好的工程应用价值。
[Abstract]:The research of siltation promoting technology is of great theoretical and practical significance for reclamation, tidal flat development and wetland protection. Therefore, more and more scholars at home and abroad are studying the more efficient and cheap technology of promoting siltation. On the basis of the research on hydrodynamic characteristics and silting mechanism of single flexible silting promoting curtain, this paper studies the force and silting effect of the outer layer of the floating curtain system in the silting promoting floating curtain group through indoor flume experiment. The main work and research results are as follows: (1) the variation of cable force of floating curtain group under uniform constant flow and vertical action is observed through fixed bed experiment. The results show that the ratio of maximum mooring cable force to hydrostatic buoyancy in floating curtain group is affected by the coverage of floating curtain, the number of flow Froude and the relative height of floating curtain. The force of floating cord in the same position of the silting floating curtain group increased firstly and then decreased with the increase of the Froude number. With the increase of floating curtain coverage, the floating curtain increased first and then decreased and then increased, and gradually increased with the increase of relative height of floating curtain. (2) based on the measured data, the empirical formula for calculating the maximum mooring force in floating curtain group is obtained by dimensionality and regression analysis. (3) through moving bed experiment, the silting effect of silting promoting floating curtain group is analyzed and studied. It is concluded that the silting effect of silting promoting floating curtain group is mainly affected by floating curtain coverage, flow Froude number and relative height of floating curtain. The siltation promoting floating curtain group has good silting effect. (4) based on the measured data, the empirical formula for calculating the deposition thickness in floating curtain group is obtained by dimensional and regression analysis. The results of this paper show that the silt-promoting floating curtain group is easy to install, stable, and has obvious effect of siltation promotion, and has good engineering application value.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U655.5

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