| 封冻河道下流速分布和阻力问题探讨 |
| |
| 引用本文： | 王军.封冻河道下流速分布和阻力问题探讨[J].水科学进展,2005,16(1):28-31. |
| |
| 作者姓名： | 王军 |
| |
| 作者单位： | 合肥工业大学土木建筑工程学院, 安徽, 合肥, 230009 |
| |
| 基金项目： | 国家自然科学基金资助项目(10372028)~~ |
| |
| 摘 要： | 封冻河道的水流阻力计算和水流速度重分布问题一直是河冰研究的重要问题之一,多年来,很多学者进行了相关研究,然而研究大多采用了冰盖区、河床区及过流断面水流平均速度相等的假定.依据Prandtal半经验紊流理论,采用目前普遍使用的对数流速分布公式,对上述假定进行了研究分析,由分析来看,这种假定的正确性需要探讨;分析也表明,阻力计算时若假定冰盖区和床面区的能坡相等,对宽浅式河道也将导出谬误.依据分析,就如何解决相应的问题提出了思路和建议.
|
| 关 键 词： | 冰盖 阻力 速度分布 平均流速 |
| 文章编号： | 1001-6791(2005)01-0028-04 |
| 收稿时间： | 2003-09-28 |
| 修稿时间： | 2003年9月28日 |
Discussion of velocity distribution and resistance under ice cover |
| |
| WANG,Jun.Discussion of velocity distribution and resistance under ice cover[J].Advances in Water Science,2005,16(1):28-31. |
| |
| Authors: | WANG Jun |
| |
| Institution: | School of Civil Engineering Hefei University of Technology, Hefei 230009, China |
| |
| Abstract: | It is very important to calculating the flow resistance and to confirm the velocity distribution under ice cover or ice jam. Many researches have been made for many years to suppose the mean velocity of flow sections is equal to that of the ice cover area and that of the bed area, and the validity of such assumption is argued in this paper based on the Prandtal's semi-empiristic turbulence theory and the formula of velocity of logarithm distribution. And it is also found that falsehood would be induced in calculating flow resistance in shallow rivers based on the assumption that the slope of energy in the ice-cover area is equal to that in the bed area.And the ways and means are proposed. |
| |
| Keywords: | ice-cover resistance velocity distribution mean velocity |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《水科学进展》浏览原始摘要信息 |
| 点击此处可从《水科学进展》下载免费的PDF全文 |
|
