河口导堤对水沙运动影响的二维数值模型

以黄河河口潮流泥沙有限元数学模型为手段，对在河口口门设置与不设置双导流堤两种情况下的入海水流泥沙运动进行了计算和分析。结果表明由于设置河口双流导堤后河口入海水流集中，能够阻断水流的横向流动和水流漫滩，使得入海水流比无导流堤时挟沙能力增加，加大了泥沙向外海的输送量。计算比较表明，最大垂线平均含沙量出现的位置外推距离约920m；在大潮时最高潮位的影响在距离口门约 9～23km的范围内。研究结果认为设置导堤后泥沙在口门附近的淤积范围和数量减少，淤积厚度最大点的位置向外海推进了230m，有利于把河口泥沙输送到深海，效果明显。

Effect of training levees on movement of water flow and sediment in Yellow River estuary

The 2-D finite element numerical model for tidal flow and sediment movement developed by the authors is applied to study the effect of training levees on water flow and sediment transport in the Yellow River estuary. The calculation result of the scheme with double parallel levees is compared with that without levee. The lengths of levees are 7km with interval 500m. The result shows that the levees play the role of restricting the transverse flow of sea-going water flow and enhancing the sediment carrying capacity. Comparing with the scheme without levees, the cross section of maximum depth average suspended sediment is extended to the downstream about 920m. The amount and range of sedimentation in the estuary are reduced and the position of maximum sediment thickness point is extended to seawards about 230m. The effect of training levees is obvious.