| 孙志林,张超凡,杜利华,许丹.非均匀悬移质输沙率[J].水利学报,2016,47(4):501-508 |
| 非均匀悬移质输沙率 |
| Transport rate of nonuniform suspended load |
| 投稿时间：2015-06-17 |
| DOI：10.13243/j.cnki.slxb.20150662 |
| 中文关键词: 悬移质 输沙率 非均匀沙 长江口 |
| 英文关键词: suspended load transport rate nonuniform sediment Yangtze Estuary |
| 基金项目:教育部博士点基金项目(2120101110108);国家自然科学基金重点项目(40231017) |
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| 摘要点击次数: 1882 |
| 全文下载次数: 50 |
| 中文摘要: |
| 结合Jasmund-Nikurads对数流速分布和作者提出的非均匀悬移质含沙量垂线分布规律,建立了非均匀悬移质输沙率公式。公式为显式函数形式,结构简单,适用于非均匀沙任意粒级,对Di=Dm且σD=1的均匀沙情形具有自适应性。考虑近底层床面至z=a处的输沙率,理论上精度有所提高。与以往积分形式的输沙率计算公式相比具有优越性。根据长江口2005至2012年实测水沙资料与计算结果的比较,两者符合良好。 |
| 英文摘要: |
| Based on integration of the Jasmund-Nikurads logarithmic velocity and the vertical profile of non-uniform suspended load concentration proposed by the author, a new formula for transport rate of nonuni-form suspended load is presented. The new formula is an explicit function with a simple form and fit for ar-bitrary fraction of nonuniform suspended load. It is self-adaptability to uniform sediment in case of Di = Dm and σD = 1. Besides,the transport rate from bed to z = a is taken into account so that the theoretical accu-racy of the formula is improved. The proposed formula shows more advantages than the previous equations. Compared measurement of flow and sediment transport collected from Yangtze Estuary during 2005 to 2012 with calculation,good agreements are obtained. |
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