| 感潮河段瞬时含沙量计算初探 |
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| 引用本文： | 丰青,李瑞杰,罗锋. 感潮河段瞬时含沙量计算初探[J]. 武汉大学学报(工学版), 2013, 46(3): 273-277,283 |
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| 作者姓名： | 丰青 李瑞杰 罗锋 |
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| 作者单位： | 1. 河海大学海岸灾害及防护教育部重点实验室,江苏南京210098;河海大学港口海岸与近海工程学院,江苏南京210098
2. 江苏省海涂研究中心,江苏南京,210036 |
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| 基金项目： | 海洋公益性行业科研专项，江苏省2012年度普通高校研究生科研创新计划项目，江苏省基础研究计划(自然科学基金)资助项目，国家自然科学基金资助项目 |
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| 摘 要： | 由瓯江及飞云江的水文实测资料分析入手,注意到垂线平均瞬时含沙量变化滞后于垂线平均流速变化的普遍现象,并对影响垂线平均瞬时含沙量变化的可能因素进行了分析.首次对流向及流向变化率与垂线平均瞬时含沙量的响应进行定量讨论,最终认为流向变化率、水深及底沙、悬沙中值粒径为影响垂线平均瞬时含沙量变化滞后现象的主要因素.采用较直观的方式对挟沙力公式进行了改进,以公式结构的不同复杂程度构造了不同的计算垂线平均瞬时含沙量的公式,经过与实测资料的比较,对各计算公式进行了分析与评价.
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| 关 键 词： | 垂线平均瞬时含沙量 流向变化率 滞后流速 |
Calculation of instantaneous depth-averaged sediment concentration for tidal effected channel |
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| FENG Qing,LI Ruijie,LUO Feng. Calculation of instantaneous depth-averaged sediment concentration for tidal effected channel[J]. Engineering Journal of Wuhan University, 2013, 46(3): 273-277,283 |
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| Authors: | FENG Qing LI Ruijie LUO Feng |
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| Affiliation: | 1.Key Laboratory of Coastal Disaster and Defence,Ministry of Education,Hohai University,Nanjing 210098,China; 2.College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China; 3.Tidal Flat Research Center of Jiangsu Province,Nanjing 210036,China) |
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| Abstract: | The common phenomenon is observed that the change rate of instantaneous depth averaged sediment concentration lags behind the one of vertical averaged flow velocity from the analysis of the field measured hydrology and sediment data of Oujiang and Feiyunjiang.In the meantime,the probable factors of the delay appearance are analyzed.The relationships among flow direction,change rate of flow direction and instantaneous depth averaged sediment concentration are discussed quantitatively for the first time.Finally,change rate of flow direction,depth,the median size of suspended sand and bed-sand are regarded as the main influence elements of the delay situation.The sediment carrying capacity formula is modified with concise methods;and different calculating equations of instantaneous depth averaged sediment concentration are deduced with varying degrees of equation structure complexity.Compared with the observed data,each formula is analyzed and evaluated. |
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| Keywords: | instantaneous depth averaged sediment concentration change rate of flow direction delay velocity |
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