长江下游径流潮汐河口段河相关系研究  

Morphological relationships of runoff tidal estuary on the lower reaches of the Yangtze River

作　　者：张玮[1] 徐鹏[1] 

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098

出　　处：《中国港湾建设》2017年第1期19-23,共5页China Harbour Engineering

基　　金：交通运输部建设科技项目(2014328J17170)

摘　　要：长江下游径流潮汐河口段受径流与潮汐共同作用,影响河床形态动力因素复杂。参照以往有关研究成果,推导出适用于径流潮汐河口段的河相关系;以长江下游澄通河段为例,利用大范围潮流数学模型,计算沿程各断面的过水面积与径流和潮流流量,验证河相关系的合理性。研究结果表明:对于径流潮汐河口段,水流包括径流部分与潮流部分,相应地,过水断面也可分为径流塑造部分与潮流塑造部分;对于径流潮汐河口段,即使有径流存在,在潮量与潮流塑造的过水断面之间也存在良好的相关关系;根据推导过程来看,所得河相关系式应该普遍适用于整个河口段,但分析表明,其可能更适合径流潮流河段,也就是潮流界以下河段。The runoff tidal estuary of the lower reaches of Yangtze River is affected by the runoff and tide; these dynamics affecting the riverbed sectional morphology are complex. According to the previous research results, we deduced the morphological relationship applicable to the runoff tidal estuary. Taking the Cheng-Tong River on the lower reaches of the Yangtze River as an example, with the help of the established large-scale flow mathematical models, we calculated the cross water area along river of each section and the discharge of runoff and tidal current to verify the rationality of the morphological relationships. The result shows that： for the runoff tidal estuary, the flow includes the runoff and tidal current, and correspondingly, water cross-section can also be divided into parts of the runoff shaping and tidal current shaping; for the runoff tidal estuary, there is a good correlation between the tidal prism and the cross-section area of the tidal current shaping, even if runoff exists. According to the derivation of the formula, the morphological relationship formula should be generally applicable to the runoff tidal estuary, but in practice this formula may be more suitable for the runoff tidal current estuary, which is below the tidal current boundary.

关 键 词：径流潮汐河口段 河相关系 数值模拟 

分 类 号：U612.23[交通运输工程—船舶及航道工程] TV147[交通运输工程—船舶与海洋工程]