鸭绿江河口潮流泥沙数值模拟

在分析鸭绿江河口实测水文泥沙资料的基础上,采用MIKE21 FM模块建立了基于多重嵌套网格模式的河口潮流场和泥沙场数学模型,模型范围为上游丹东市的江桥至河口江海分界线以外6~7 m等深线附近,并对2个潮位站、15个流速流向和含沙量测站进行了验证,对现状条件下的河口水域流场和泥沙场进行了数值模拟与分析。研究结果表明:落潮流速一般大于涨潮,沿程变化上浪头港以下2 km附近及斗流浦航槽内平均流速较大,至河口段水面逐渐放宽,致使落潮水流流速有减小趋势;含沙量沿程呈递增趋势,最大含沙量出现在各分汊水道的上口,即斗流浦水域。

Numerical simulation of tidal current and sediment in Yalu River estuary

According to the observed field data of hydrology and sediment in Yalu River estuary,mathematical models with multiple nested grids of tidal current and sediment in estuary had been set up by using of MIKE 21 FM module,covering the area from Jiangqiao bridge in Dandong city to 6～7 m isobath.And verification and validation were carried out on the field measured data of 2 tidal stations and 15 stations of current velocity,direction and sediment concentration.Then the tidal current field and suspended sediment field were numerically simulated.The results show that: the ebb velocity is usually greater than the flood current velocity.The maximum mean velocity is present to the downstream part of Langtou Port and Douliupu channel.Due to the broadened water surface in the estuary,the ebb velocity tends to decrease.Sediment concentration shows the trend of increase along the channel,and the maximum sediment concentration is present to Douliupu area,which is the upriver of braided channel.