摘要
刁口河是黄河备用入海流路。结合近年刁口河流路管理范围内拟建涉河工程的案例分析,指出进行防洪评价时,除了完成防洪评价导则规定的内容外,还应该考虑备用流路的河道地形、入海口潮位、河长等边界条件特点,从偏于安全角度选取边界条件。对壅水和冲刷计算应采用刁口河流路刚启用时的现状河道水位,但壅水计算采用平均高潮位,考虑海平面上升影响,而冲刷计算采用平均低潮位,且不考虑海平面上升。对堤顶高程和桥梁下弦高程则应采用行河末期、主槽开挖后10 000 m^3/s流量的对应水位。梁底设计标高考虑一定的超高和净空,且应不小于防洪、交通及通航要求的最大值。桥墩位置和桥孔跨度要考虑黄河流冰尺寸,以保证凌汛期安全。
Diaokou River is an alternate flow path of the Yellow River in the estuary area. Based on the case study of proposed river-related project within the management scope of Diaokou River in recent years, the flood impact assessment in this area should not only satisfy the requirements of the flood impact assessment guidelines, but also take the features of alternate flow path into consideration. The river channel terrain characteristics, terminal tidal level, river length, etc. should be analyzed accordingly. For backwater height and scouring depth calculations, the water level of current river channel at the initial operation stage should be adopted. For backwater height calculation, the average high tide level with the impact of sea level rising should also be considered, while for scouring depth calculation the average low tide level without the impact of sea level rising should be adopted. For dikes crest and bridge beam bottoms elevation, the water level corresponding to discharge 10,000 m^3/s at the final operation stage with newly excavated mainstream section should be used. Meanwhile, a freeboard and headroom should be included to satisfy all the requirements of flood control, transport and navigation in the determination of bridge beam bottoms elevation. In addition, the impact of ice size on hole-span layout should be considered to ensure the project safety.
作者
刘娟
钱裕
陈雄波
LIU Juan;QIAN Yu;CHEN Xiongbo(Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China)
出处
《人民黄河》
CAS
北大核心
2020年第6期37-41,共5页
Yellow River
基金
国家重点研发计划项目(2017YFC0405506)。
关键词
刁口河
涉河工程
防洪评价
关键技术
黄河河口
Diaokou River
river-related project
flood impact assessment
key technology
Yellow River estuary
