摘要
河流和与之相邻的港池、坝田之间,河流的滩槽之间,都发生着动量和质量交换。通过二维水沙模型以及理论模型分析了不同丁坝间距对河床冲刷的影响,研究发现:当丁坝间距逐渐增大时,坝头冲刷深度也逐渐增加,主槽内的冲刷分布变得不均匀;涨急和落急时刻坝田与主槽的水沙交换系数均在0.01~0.04之间;在涨急时刻,随着丁坝间距的增加其交换系数逐渐减小,并呈良好的线性关系;但在落急时刻,在丁坝间距为4倍坝长时交换系数最大;随着丁坝间距的增加,主槽的平均流速逐渐减小。整体呈现为随着丁坝间距的增加,主槽的平均冲刷深度逐渐减小。
There are momentum and mass exchanges between rivers and its adjacent harbors,dam fields and river channels.This paper analyzes the influence of different spur dike spacing on river bed scouring by two-dimensional water-sediment model and theoretical model.The results show that with the gradual increase of the spur dike spacing,the scouring depth of the dam head increases slowly,and the scouring distribution in the main channel becomes uneven.Under the maximum flood and ebb velocity,the exchange coefficient of water and sediment between the dam field and the main channel is from 0.01 to 0.04.Under the maximum flood velocity,the exchange coefficient decreases gradually with the increase of spur dike spacing in linear relationship.But under the maximum ebb velocity,the exchange coefficient is the largest when spur dike spacing is 4 times longer than dike;and with the increase of spur dike spacing,the average flow velocity in the main channel decreases gradually.As a whole,the average scouring depth of the main channel decreases with the increase of spur dike spacing.
作者
王任超
张功瑾
胡彩霞
刘锐
吴栋栋
WANG Renchao;ZHANG Gongjin;HU Caixia;LIU Rui;WU Dongdong(Pearl River Water Resources Commission of the Ministry of Water Resources,Guangzhou 510611,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute,Nanjing 210029,China)
出处
《人民珠江》
2020年第1期63-68,共6页
Pearl River
关键词
潮汐河口
丁坝
河床容积
整治水域
泥沙淤积
tidal estuary
spur dikes
riverbed volume
waters regulation
sediment deposition
