鸭绿江河口潮汐及水沙输运特征研究

构建以鸭绿江河口为核心的大范围二维潮流泥沙数学模型，研究新边界条件下的大东水道水沙输运特征。结果表明，鸭绿江河口所在的海湾M2分潮等潮时线总体呈南北方向，潮流旋转方向为逆时针方向；潮波自河口外侧向西水道方向，M2分潮振幅逐渐增大，在庙沟港池附近达到最大，潮波浅水变形口外与西水道变幅可达20%；大东水道深槽水流强度明显较大，庙沟港池东南侧水域含沙量最大，自一港池附近水域向外海含沙量呈降低趋势；大东水道欧拉余流和斯托克斯漂流均向海，落潮单宽潮量及单宽输沙量大于涨潮，净潮量、净输沙量均向海，大东水道泥沙输运以大潮期为主，泥沙主要来源为西水道滩涂和大东水道东侧滩涂。

Tidal and water-sediment transport characteristics in Yalu River Estuary

We build a large-scale 2D tidal current and sediment mathematical model based on the Yalu River Estuary to study the water-sediment transport characteristics of Dadong waterway under the new boundary conditions.The results show that the M2 tidal isochron of the bay where the Yalu River Estuary is located is generally in the north-south direction,the tide rotation direction is counterclockwise.The M2 tidal amplitude gradually increases with the tidal wave from the outer side of the estuary towards the western waterway,reaching its maximum near the Miaogou Port Basin.The amplitude of the tidal wave deformation outside the mouth and in the western waterway can reach 20%.The flow intensity in the deep channel of Dadong waterway is obviously large,the sediment concentration in the southeast of Miaogou Port Basin is the largest,and the sediment concentration from the waters near the first harbor basin is decreasing.The Euler residual current and Stokes drift direction in Dadong waterway are seaward.The unit width tidal volume and unit width sediment transport volume at ebb tide are greater than that at flood tide.The direction of net tidal volume and net sediment transport volume is seaward.The sediment mainly comes from the mudflat of the west waterway and the mudflat on the east side of Dadong waterway.