| 分汊河道水沙输移特征试验 |
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| 引用本文： | 余新明,谈广鸣,张悦,赵培. 分汊河道水沙输移特征试验[J]. 武汉大学学报(工学版), 2007, 40(4): 9-12,17 |
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| 作者姓名： | 余新明 谈广鸣 张悦 赵培 |
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| 作者单位： | 1. 武汉大学水资源与水电工程科学国家重点实验室,湖北,武汉,430072;长江航道局,湖北,武汉,430010
2. 武汉大学水资源与水电工程科学国家重点实验室,湖北,武汉,430072 |
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| 基金项目： | 国家重点基础研究发展计划(973计划);国家自然科学基金 |
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| 摘 要： | 根据分流河道的水沙特性,对现有的水沙输移计算模式进行了分类,总结了分汊河道分流分沙计算模式在国内外研究发展的现状,并进行了简要的分析评论,继而通过水槽试验对分汊河道整体水流结构和底沙输移演化特征进行了初步的探讨.试验结果表明:在汊道洲头和洲尾的局部范围内流速减小较明显,洲尾处出现水流分离区且左右两侧为高流速区;主、支汊流量的分配决定底沙输移强度,最大冲刷深度在主汊分流口下游.
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| 关 键 词： | 分汊河道 分流分沙 含沙量 |
| 文章编号： | 1671-8844（2007）04-0009-04 |
| 修稿时间： | 2006-12-20 |
Experiment on transportation characteristics of flow and sediment in distributaries channel |
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| YU Xinming,TAN Guangming,ZHANG Yue,ZHAO Pei. Experiment on transportation characteristics of flow and sediment in distributaries channel[J]. Engineering Journal of Wuhan University, 2007, 40(4): 9-12,17 |
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| Authors: | YU Xinming TAN Guangming ZHANG Yue ZHAO Pei |
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| Affiliation: | 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. Changjiang Waterway Bureau, Wuhan 430910, China |
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| Abstract: | Based on the characteristics of flow and sediment in braided channels,the computational models current used for flow and sediment diversion are classified;and their development at home and aboard is briefly summarized.By means of flume experiment,the flow structure and bed load transport in braided channel are analyzed.The results show that near the head and tail part of island,the decrement of velocity is obvious.At the same time,a zone separated immediately downstream of the confluent channel and high velocity zone at both sides are appeared;the bed load transport and local scour strongly depend on the flow and sediment conditions of mainstream and tributary;the maximum scour depth occurs in the outlet of main-branch. |
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| Keywords: | distributaries channel diversion of flow and sediment sediment concentration |
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