长江下游南京河段马汊河口航道流态及泥沙淤积特性研究

选择南京八卦洲河段马汊河入江口门,建立二维潮流、泥沙数学模型,对入江口门航道流态、水流泥沙运动特征以及口门泥沙淤积特性进行研究。结果表明,中、洪水条件下,八卦洲河段内不存在涨潮流,但口门内仍然存在往复流。河床冲淤变形计算结果表明,口门向内泥沙淤积呈由大到小的分布规律,口门回流区淤积厚度最大。不同水文特征年泥沙淤积程度不同,随淤积历时增长,泥沙逐年淤积量略有减少,且淤积泥沙由口门逐渐向航道推进。

Study on flow pattern and characteristics of sediment deposition in Nanjing Macha river mouth of the lower Yangtze River

Taking the Nanjing Macha river mouth of the lower Yangtze River as an example,a two-dimensional flow and sediment mathematical model was established to study the flow pattern and characteristics of sediment deposition.The results show that there is no existence of flood current in Nanjing Baguazhou reach, but there still exists reversing tidal current inside the Macha river under the condition of flood.The calculated results of river bed deformation indicate that the deposition in Macha river mouth is more serious than that inside the Macha river,and the maximum thickness of deposition is in the recirculation region.The deposition thickness is different in different hydrological years,and the sediment deposition decreases with the increase of silting duration.