| 河岸糙率对明渠宽深比影响的研究 |
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| 引用本文： | 黄才安,周济人,赵晓冬.河岸糙率对明渠宽深比影响的研究[J].水利学报,2011,42(11). |
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| 作者姓名： | 黄才安 周济人 赵晓冬 |
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| 作者单位： | 1. 扬州大学水利学院,江苏扬州,225009
2. 南京水利科学研究院河港研究所,江苏南京,210024 |
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| 基金项目： | 国家自然科学基金(50779060); 港口航道泥沙工程交通行业重点实验室基金(200901) |
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| 摘 要： | 研究了河岸河床相对糙率对明渠宽深比的影响。根据定床渠道、临界渠道和动床渠道3种类型渠道,采用最小能耗率原理,分别构建了宽深比计算的优化模型。结合综合糙率公式,利用条件极值问题优化计算方法,得到了不同类型渠道条件下的宽深比与河岸河床相对糙率之间的定量关系。分析计算结果表明,定床明渠随河岸糙率的增大,宽深比增大;而临界渠道和动床渠道随河岸糙率的增大,宽深比减小。河岸糙率大于河床糙率时,定床渠道为了降低河岸高糙率对流量的影响,从而宽深比增大;而临界渠道和动床渠道,由于河岸糙率大时其抗冲能力大,因而宽深比减小。这些结论可供明渠水力设计时参考。
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| 关 键 词： | 宽深比 最小能耗率 综合糙率 水力设计 明渠 |
Study on the effects of bank roughness on width-depth ratio in open channels |
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| HUANG Cai-an,ZHOU Ji-ren,ZHAO Xiao-dong.Study on the effects of bank roughness on width-depth ratio in open channels[J].Journal of Hydraulic Engineering,2011,42(11). |
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| Authors: | HUANG Cai-an ZHOU Ji-ren ZHAO Xiao-dong |
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| Affiliation: | HUANG Cai-an1,ZHOU Ji-ren1,ZHAO Xiao-dong2(1. Yangzhou University,Yangzhou 225009,China,2. Nanjing Hydraulic Research Institute,Nanjing 210024,China) |
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| Abstract: | The effects of bank roughness on width-depth ratio are discussed in this paper. Based on the principle of minimum stream power,the optimization models for calculating the width-depth ratio are constructed for fixed-bed channel,threshold channel,and movable-bed channel,respectively. Combined with Einstein's comprehensive roughness equation,the quantitative relations between width-depth ratio and bank relative roughness for different types of channel are derived by using calculation method of conditional extr... |
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| Keywords: | width-depth ratio minimum stream power comprehensive roughness hydraulic design open channels |
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