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工程科学与技术:2016,48(Z1):14-19
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堆积体作用下水流水力特性变化试验研究(研究生论坛)
(1.四川大学水力学与山区河流开发保护国家重点实验室;2.四川大学 水力学与山区河流开发保护国家重点实验室)
Experimental Study on the Variation of Flow Hydraulic Characteristics under the Effect of Congeries
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投稿时间:2015-07-08    修订日期:2016-01-11
中文摘要: 河道中存在堆积体时,水流水力特性将会改变。为分析堆积体不同阻水作用下的作用机理,本文进行了水槽试验。通过对床面比降、堆积体尺度和上游来流条件的控制,研究了不同堆积体尺度条件下的水位变化,分析了堆积体对附加比降的影响,探讨了堆积体附近水流流态的变化规律。结果表明:河道比降相同时,流量越小、堆积体尺度越大,壅水高度和影响范围越大。其它条件相同时,随着河道比降的增大,水流从缓流向急流发展,附加比降值随堆积体尺度的增大而增大;但达到急流条件后,水面附加比降随堆积体尺度增大反而有减小的趋势。
中文关键词: 堆积体  壅水  附加比降  弗劳德数
Abstract:With the existence of congeries in the river channel,the hydraulic characteristics were changed.In order to analyze the mechanism of accumulation in different water resistance, the flume experiment was carried out.The change of hydraulic characteristic caused by different sizes of congeries was obtained by controlling the slope of the bed surface,the size of the congeries and the flow of upstream.The result showed that the height and the range of backwater were larger due to the smaller flow and the larger congeries with the same slope of water channel.With the increasing of water channel slope,the water changed from subcritical flow to riffle, in the same conditions.The additional gradient increased with the increase of congeries size.But the additional gradient decreased with the increase of congeries size if the water turned into riffle.
文章编号:201500668     中图分类号:    文献标志码:
基金项目:国家自然科学基金项目(51409224),国家科技支撑计划(2012BAB05B02),国家自然科学基金项目(50949057)
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李果,郭志学,李彬,黄小利,陈日东.堆积体作用下水流水力特性变化试验研究(研究生论坛)[J].工程科学与技术,2016,48(Z1):14-19.
liguo,Guo Zhi-xue,Li Bin,huangxiaoli,Chen Ri-dong.Experimental Study on the Variation of Flow Hydraulic Characteristics under the Effect of Congeries[J].Advanced Engineering Sciences,2016,48(Z1):14-19.