摘要
砂枕自水面抛投后,受重力和水流的推移力作用,在下沉的过程中,会产生顺水流方向的落距。砂枕落入河底后还会具有一定的速度,若这个速度大于砂枕的止动流速,那么砂枕还会继续运动,而砂枕自触碰床面后发生的移动距离为稳定移距(二次漂距)。根据砂枕在动水中的漂移规律进行试验,结合垂线流速分布规律,通过3种漂距计算方法得到砂枕水下漂移到着床稳定全过程的漂移距离计算公式,并进行对比分析。结果表明,当河流的垂线流速为指数型流速分布时,使用惯性力法和综合系数法推导出的漂距公式适用性较好。
After the sand pillow is thrown from the water surface,it will have a drift distance in the direction of the water flow during the sinking process under the action of gravity and water flow.The sand pillow will still have a certain speed after falling into the river bottom,if the speed is greater than the stopping velocity of the sand pillow,the sand pillow will continue to move,and the movement distance after the sand pillow touching the bed surface is a stable displacement(secondary drift distance).According to the drift rule of sand pillow in dynamic water,combined with the vertical velocity distribution rule,the drift distance calculation formula of sand pillow in the whole process from underwater drift to landing stability is obtained through three drift distance calculation methods,and the comparative analysis is carried out.The results show that when the vertical velocity of the river is exponential velocity distribution,the drift distance formulas derived by using the inertial force method and the comprehensive coefficient method have good applicability.
作者
王茂枚
侯悦
王宏伟
张子鹏
朱昊
WANG Maomei;HOU Yue;WANG Hongwei;ZHANG Zipeng;ZHU Hao(Jiangsu Hydraulic Research Institute,Nanjing 210017,China;Information Center of Jiangsu Water Resources,Nanjing 210004,China;Nanjing Water Construction Engineering Co.,Ltd.,Nanjing 210003,China)
出处
《水运工程》
北大核心
2023年第11期30-36,共7页
Port & Waterway Engineering
基金
江苏省水利科技项目(2020007、2021034、2021063)。
关键词
河道治理
垂线流速
砂枕落距
二次漂距
riverway regulation
vertical velocity
falling distance of sand pillow
secondary drift distance
