来水流量变化条件下沙洲冲淤试验研究
|
摘要
河道中沙洲的发育变形受上游来水流量大小的影响较大,不同来水流量情况下沙洲的冲淤变形以及发育机理有一定的差别。通过椭圆形沙洲在来水流量变化条件下的冲淤试验,绘制沙洲俯视图以及剖面图,分别对沙洲的总体以及局部特征断面进行对比分析。结果表明,洲头冲刷较明显,洲尾未有明显冲刷现象。河道凸岸边沙洲流量越大,冲刷越明显,河道凹岸侧的淤积越明显。流量越大,沙洲的冲淤现象越明显,整体的偏移量越多,变形越明显。
The developmental deformation of the sandbank in the river channel is greatly affected by the flow of water from the upstream. There are some differences in the deformation and development mechanism of the sandbank under different water flows. Through the scouring and silting test of the elliptical sandbar under the condition of the incoming water flow change, the top view and the sectional view of the sandbar are drawn, and the overall and local characteristic sections of the sandbar are compared and analyzed. The results show that the head scouring is more obvious, and there is no obvious scouring phenomenon at the tail. The greater the flow rate of the sandbank on the bank of the river, the more obvious the scouring, and the more obvious the siltation on the bank side of the river. The larger the flow rate, the more obvious the erosion and siltation phenomenon of the sandbar. The more the overall offset, the more obvious the deformation.
The developmental deformation of the sandbank in the river channel is greatly affected by the flow of water from the upstream. There are some differences in the deformation and development mechanism of the sandbank under different water flows. Through the scouring and silting test of the elliptical sandbar under the condition of the incoming water flow change, the top view and the sectional view of the sandbar are drawn, and the overall and local characteristic sections of the sandbar are compared and analyzed. The results show that the head scouring is more obvious, and there is no obvious scouring phenomenon at the tail. The greater the flow rate of the sandbank on the bank of the river, the more obvious the scouring, and the more obvious the siltation on the bank side of the river. The larger the flow rate, the more obvious the erosion and siltation phenomenon of the sandbar. The more the overall offset, the more obvious the deformation.
引文
[1]高进,河流沙洲发育的理论分析[J].水利学报,1999(6), 66-70.
[2]彭玉明,阳立群,杨晓刚.荆江汊道分流分沙变化及特性分析[J].人民长江,2008(14):62-64.
[3]李志威,王兆印,李文哲,张晨笛,吕立群.卵石沙洲发育与冲刷试验[J].水科学进展,2014,25(06):797-805.
[4]李志威,王兆印,余国安,冲积河流的沙洲发育模式与机理[J].应用基础与工程科学学报, 21(3), 489-500.
[5]李志威,王兆印,张康,典型沙洲形态与河道的关系[J].泥沙研究,2012(1), 68-73.
[6]李龙成,陈光兰,岑静,程平.长江上游岷江流域水沙变化特征分析[J].人民长江,2008(20):42-44+49+98.
[7]曹耀华,张春生,刘忠保,孟蘅,赖志云,侯勇.长江枝江段凤凰滩现代沉积特征[J].江汉石油学院学报,1994(04):8-14.
[8]王梅力,林孝松,刘怀汉,王平义.清水冲刷条件下长江监利河道演变概化模型试验[J].人民长江,2014,45(S1):4-7.
[9]田明武,刘艺平,王强,聂锐华.挟沙水流床面冲刷深度试验研究[J].人民长江,2016,47(03):76-78.
[10]窦国仁.再论泥沙起动流速[C].中国水利学会.中国水利学会2001学术年会论文集.中国水利学会:中国水利学会,2001:7.
[2]彭玉明,阳立群,杨晓刚.荆江汊道分流分沙变化及特性分析[J].人民长江,2008(14):62-64.
[3]李志威,王兆印,李文哲,张晨笛,吕立群.卵石沙洲发育与冲刷试验[J].水科学进展,2014,25(06):797-805.
[4]李志威,王兆印,余国安,冲积河流的沙洲发育模式与机理[J].应用基础与工程科学学报, 21(3), 489-500.
[5]李志威,王兆印,张康,典型沙洲形态与河道的关系[J].泥沙研究,2012(1), 68-73.
[6]李龙成,陈光兰,岑静,程平.长江上游岷江流域水沙变化特征分析[J].人民长江,2008(20):42-44+49+98.
[7]曹耀华,张春生,刘忠保,孟蘅,赖志云,侯勇.长江枝江段凤凰滩现代沉积特征[J].江汉石油学院学报,1994(04):8-14.
[8]王梅力,林孝松,刘怀汉,王平义.清水冲刷条件下长江监利河道演变概化模型试验[J].人民长江,2014,45(S1):4-7.
[9]田明武,刘艺平,王强,聂锐华.挟沙水流床面冲刷深度试验研究[J].人民长江,2016,47(03):76-78.
[10]窦国仁.再论泥沙起动流速[C].中国水利学会.中国水利学会2001学术年会论文集.中国水利学会:中国水利学会,2001:7.