摘要
对相对柱径较大(0.15<D/L<0.5)的圆柱式结构物在不规则波作用下周围的局部冲刷情况,进行了多组试验研究,系统地研究了不规则波作用下圆柱周围地形的变化规律,试验中分别考虑了波浪的波高、周期、水深、泥沙粒径及圆柱直径等因素对圆柱周围局部冲刷地形的影响,分析了圆柱周围冲淤地形形成的机理,特别是对床面泥沙粒径因素进行了详细分析,认为波浪作用下圆柱周围冲刷深度与床面粒径并不成反比关系,而是在d50=0.18 mm附近最小,在此基础上提出了不规则波作用下圆柱周围最大冲刷深度及其发生位置的计算公式。
A series of physical model tests for local scour around a circular cylinder with relatively large diameters (0.15 〈 D/L 〈 0.5) under the action of irregular waves are conducted. The change of the topography around the cylinder is systematically studied. The affecting factors, including wave height, period, water depth, sediment grain size and cylinder diameter, are taken into account. The formation mechanism of the topography around the cylinder is analyzed. A detailed analysis shows that the scour depth around the cylinder under wave action is not inversely proportional to the sediment grain diameter. On such a basis, an equation is put forward for the calculation of the maximum scour depth and its position around a cylinder under the action of irregular waves.
出处
《泥沙研究》
CSCD
北大核心
2007年第5期17-23,共7页
Journal of Sediment Research
基金
交通部跨世纪优秀专业技术人才基金项目资助
关键词
墩柱
局部冲刷
不规则波
large circular cylinder
local scour
irregular wave